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A-BEAM W
Design Instructions 2
Design Instructions A-BEAM W Revision 6/2017
A-BEAM W
Design Instructions 3
Design Instructions A-BEAM W Revision 6/2017
TABLE OF CONTENTS
1 A-BEAM W ................................................................................................................................................................. 4 2 Structure of the composite beam ................................................................................................................................. 4
2.1 Composite beam manufacturing programme .................................................................................................. 4 2.2 Composite beam applications ......................................................................................................................... 5
2.2.1 W-type beam in the building’s frame system ..................................................................................... 5 2.2.2 Using a composite beam in a hollow-core slab floor ........................................................................ 5
2.3 Structural dimensions of the beam .................................................................................................................. 7 2.3.1 Intermediate beam ............................................................................................................................. 7 2.3.2 Edge beam ......................................................................................................................................... 8
3 PRODUCT APPROVAL AND MANUFACTURING .................................................................................................. 9 4 COMPOSITE BEAM DESING CRITERIA ................................................................................................................. 9
4.1 Design and manufacturing standards ............................................................................................................. 9 4.2 Composite beam design instructions for the main structural engineer ......................................................... 10
4.2.1 Applications for the beams .............................................................................................................. 10 4.2.2 Selecting the beam as the building’s floor beam ............................................................................. 10
4.3 Structural function of the composite beam .................................................................................................... 11 4.3.1 Functional cross-section of the structure ........................................................................................ 11 4.3.2 Design loads and load combination ................................................................................................ 12 4.3.3 Structural design of the composite beam ......................................................................................... 14
5 COMPOSITE BEAM DESIGN ................................................................................................................................. 17 5.1 Design-and-build deal ................................................................................................................................... 17 5.2 ABeam software for composite beams ........................................................................................................... 18 5.3 Joint action of the composite beam and hollow-core slab ............................................................................ 21
5.3.1 Placement of the hollow-core slab .................................................................................................. 21 5.3.2 Addition steel for the beam .............................................................................................................. 22 5.3.3 Grouting for the structure ............................................................................................................... 24 5.3.4 Surface casting of the hollow-core slab .......................................................................................... 24
5.4 Composite beam connections ........................................................................................................................ 25 5.4.1 Standard connections of the beam ................................................................................................... 25 5.4.2 Hidden bracket connection to a concrete column ........................................................................... 25 5.4.3 Hidden bracket connection to a composite column ......................................................................... 26 5.4.4 Beam coupler connection in the field .............................................................................................. 27 5.4.5 End plate connection to the side of another beam ........................................................................... 27 5.4.6 Bolt connection on top of a column or wall .................................................................................... 28 5.4.7 Welded connection to a mounting plate on top of a column or wall ............................................... 28 5.4.8 Additional fixings to the beam for building services on the site ...................................................... 29
5.5 Fire protection of the beam and connections ................................................................................................ 29 5.6 Service life design of the structure ................................................................................................................ 30
6 DESIGN-AND-BUILD DEAL DELIVERY DOCUMENTS....................................................................................... 31
Revision G. 31 May 2018
Minor corrections to the text. English version published.
Revision F. 31 May 2018
Minor corrections to the text. English version published.
Revision E. 26 June 2017
The user manual has been rewritten.
The design instructions have been separated into their own manual.
The name of the old A-Beam has been changed. The new name is A-BEAM W.
A new A-Beam type has also been developed: A-BEAM S. Separate design and erection instructions have been prepared for the
beam.
The beam’s product approval has been changed. The new product approval is CE marking according to EN 1090-1.
The design instructions for the beam have been updated.
The quick dimensioning software for the beam has been updated.
The new software version, ABeam 4.7, was published on 31 ay 2018.
A-BEAM W
Design Instructions 4
Design Instructions A-BEAM W Revision 6/2017
1 A-BEAM W
The W-type composite beam has been particularly designed for winter construction conditions. The
beam acts as the load-bearing composite structure of a low intermediate floor. The housing is made
of steel plate, and its bending resistance is adjusted by means of reinforcement and lower flange
thickness. The W beam housing is filled with concrete at the machine shop. In the final stage, the
beam acts as a composite structure with the hollow-core slabs and the surface casting. The bending
resistance of the beam is sufficient for the loads on the hollow-core slabs during erection. The beam
is used as both a single-span and continuous-span structure and designed without separate fire
protection up to fire resistance class R180. The standard connection is the AEP hidden bracket to a
reinforced concrete column and the AEL hidden bracket to a composite column. A connection
library has also been prepared for the beam for typical connections to various frame structures.
Presentation material on the beam is available on our website.
Figure 1. A-BEAM W composite beam in a building frame
2 STRUCTURE OF THE COMPOSITE BEAM
2.1 Composite beam manufacturing programme
Anstar Oy’s manufacturing programme for composite beams includes two cross-section types:
- A-BEAM W The beam housing is filled with concrete at the machine shop.
- A-BEAM S The beam housing is grouted after erection on the site.
These design instructions apply to A-BEAM W beams grouted at the machine shop, in Figure 2.
Figure 2. Structure of composite beams. Beam types W and S
A-BEAM W
Design Instructions 5
Design Instructions A-BEAM W Revision 6/2017
The manufacturing programme for beam type W has been adapted for standard dimensions in
accordance with the hollow-core slab height and concrete column width. Beams with different
dimensions are manufactured for demanding applications.
Table 1. A-BEAM W. Standard intermediate and edge beams
2.2 Composite beam applications
2.2.1 W-type beam in the building’s frame system
A-BEAM W is a composite beam designed for low intermediate floors. Together with the hollow-
core slab and grouting concrete, it forms a composite structure whose bending resistance is adjusted
by means of rebar and the lower flange’s plate thickness. The pieces of rebar inside the housing act
in design for fire situations. The web widths for an intermediate beam have been specified according
to the standard dimensions of the concrete columns and, for an edge beam, there is a narrower
application for a one-sided hollow-core slab.
The beam is connected to a reinforced concrete or composite column or a concrete wall using either
AEP or AEL hidden brackets, or on top of a support using normal connection methods. The beam
can be used as a multi-span Gerber beam hanger going over supports, in which case the coupler
connection is located in the field.
2.2.2 Using a composite beam in a hollow-core slab floor
The beam is used to implement a floor structure with no structures hindering building services under
the floor. The beam acts as a composite structure that enables the use of longer, more slender
structures.
1. Floor structures
The beam is used as the load-bearing structure for hollow-core slabs. The slab can be used
without a surface structure, with a 10-40 mm layer of filler or with reinforced concrete topping.
The minimum thickness of concrete topping acting as a composite structure is 40 mm, and it can
be implemented in the roof with a concrete bay located in the insulation space. The reinforced
concrete topping significantly increased the bending resistance of the structure and also protects
the upper flange against corrosion and fire. In other cases, the upper flange must be protected
separately in accordance with the exposure class.
380280200 480 580 280200 580
265
200
380
400
370
500
320
480
A-BEAM W
Design Instructions 6
Design Instructions A-BEAM W Revision 6/2017
Figure 3. Intermediate floor structure, reinforced surface slab and surface filler
2. Level difference between slabs
Hollow-core slabs of different heights are levelled with an intermediate beam where an
elevation part is welded on top of the other lower flange. The elevation part does not change the
structural function of the beam, and the elevation part is filled with concrete. The resistance of
the beam can be increased, and deflection reduced by elevating both flanges. The beam can also
be used to implement slight level differences in the top surface of the slab as necessitated by
various surface materials, for example.
Figure 4. Roofing structure, reinforced surface casting bay and hollow-core slabs of different
heights
3. Edge of the floor
The beam is located at the edge of the floor, and an edge bay can be cast up to the surface of the
exterior wall. Flange elevation parts can be used to increase the resistance of the structure and
reduce deflection in floors with the necessary space. The beam can also be used to implement
slight level differences in the top surface of the slab as necessitated by various surface materials,
for example. Thicker surface structures required by wet rooms can also be implemented
according to this principle.
Figure 5. Floor edge structure and level difference at the top surface of the slab
The following figures show the erection principles of the beam’s supplementary reinforcement
in the horizontal joints of the hollow-core slab.
A-BEAM W
Design Instructions 7
Design Instructions A-BEAM W Revision 6/2017
2.3 Structural dimensions of the beam
2.3.1 Intermediate beam
An intermediate beam is used for a line where there are hollow-core slabs on both sides of the beam.
The web width is selected according to the column width and the height according to the hollow-core
slab height. With long span lengths or high loads, the housing can be elevated using an L-profile
welded to the lower flange. The bracket is located on the centre line of the profile (and column). A
low beam (type m) is suitable for floors that have no surface casting or only have a thin layer of filler
(10–40 mm) on top of the slab.
Figure 6. Intermediate beam structure
Table 2. Intermediate beam dimensions
Type A B C D H H1 M
Normal/low mm mm mm mm mm mm mm
/ A200W-200m 395 200 97.5 / 160 / 160 / 190 100
A200W-280 / A200W-280m 495 280 107.5 220 / 210 180 / 150 210 / 185 140
A200W-380 / A200W-380m 660 380 140 320 / 310 180 / 150 210 / 185 190
A265W-280 / A265W-280m 495 280 107.5 195 / 225 240 / 220 275 / 255 140
A265W-380 / A265W-380m 660 380 140 275 / 310 240 / 220 275 / 255 190
A320W-280 / A320W-280m 495 280 107.5 225 / 225 295 / 270 330 / 305 140
A320W-380 / A320W-380m 660 380 140 290 / 300 295 / 270 330 / 305 190
A320W-480 / A320W-480m 760 480 140 390 / 400 295 / 270 330 / 305 240
A370W-380 / A370W-380m 660 380 140 295 / 280 335 / 315 380 / 355 190
A370W-480 / A370W-480m 760 480 140 350 / 380 330 / 315 375 / 355 240
A400W-380 / A370W-380 660 380 140 310 / 295 370 / 335 410 / 380 190
A400W-480 / A370W-480 760 480 140 375 / 350 370 / 330 410 / 375 240
A400W-580 860 580 140 475 370 410 290
A500W-480 / A500W-480m 760 480 140 380 / 370 465 / 440 505 / 480 240
A500W-580 / A500W-580m 860 580 140 435 / 475 465 / 440 505 / 480 290
Legend: A = Lower flange width
B = Web width at bottom
C = Flange projection width
D = Web width at top
H = Beam housing height
H1 = Overall height with standard reinforcement
M = Beam centre line = standard positioning dimension of hidden bracket
connection
Tube 50*70 provided for the torsional steel at the hollow-core slab’s seams
A-BEAM W
Design Instructions 8
Design Instructions A-BEAM W Revision 6/2017
2.3.2 Edge beam
An edge beam is used for a line where there is a hollow-core slab on one side of the beam only.
There may be edge bay casting on the other side. The web width is selected according to the column
width and the height according to the hollow-core slab height. With long span lengths or high loads,
the housing can be elevated using an L-profile welded to the lower flange. The bracket is located on
the centre line of the profile (and column). A low beam (type m) is suitable for floors that have no
surface casting or have a thin layer of filler (10–40 mm) on top of the slab.
Figure 7. Edge beam structure
Table 3. Edge beam dimensions
Type A B C D H H1 M
Normal/low mm mm mm mm mm mm mm
/ AR200W-200m 300 180 100 160 / 160 / 190 100
AR200W-280 / AR200W-280m 395 260 115 240 180 / 155 210 / 185 140
AR200W-380 / AR200W-380m 495 360 115 340 180 / 155 210 / 185 190
AR265W-280 / AR265W-280m 395 260 115 240 240 / 220 275 / 255 140
AR265W-380 / AR265W-380m 495 360 115 340 240 / 215 275 / 250 190
AR320W-280 / AR320W-280m 395 260 115 240 290 / 265 325 / 300 140
AR320W-380 / AR320W-380m 495 360 115 340 290 / 270 325 / 305 190
AR320W-480 / AR320W-480m 595 460 115 440 290 / 270 325 / 305 240
AR370W-380 / AR370W-380m 520 360 140 340 335 / 315 375 / 355 190
AR370W-480 / AR370W-480m 620 460 140 440 335 / 315 375 / 355 240
AR400W-380 / AR370W-380 520 360 140 340 370 / 335 410 / 375 190
AR400W-480 / AR370W-380 620 460 140 440 370 / 335 410 / 375 240
AR400W-580 720 560 140 540 370 410 290
AR500W-480 / AR500W-480m 620 460 140 440 465 / 440 505 / 480 240
AR500W-580 / AR500W-580m 720 560 140 540 465 / 440 505 / 480 290
Legend: A = Lower flange width
B = Web width at bottom
C = Flange projection width
D = Web width at top
H = Beam housing height
H1 = Overall height with standard reinforcement
M = Beam centre line = standard positioning dimension of hidden bracket
connection
Tube 50*70 provided for the torsional steel at the hollow-core slab’s seams
A-BEAM W
Design Instructions 9
Design Instructions A-BEAM W Revision 6/2017
3 PRODUCT APPROVAL AND MANUFACTURING
ANSTAR Oy has entered into a quality control agreement with Inspecta Oy regarding the
manufacture of steel parts for composite beams. Manufacture according to EN 1090-2 in execution
class EXC2 or EXC3.
CE marking according to EN 1090-1. The certificates can be found on the company website.
Quality control of the concrete grouting inside the housing and the joint grouting is carried out in
accordance with EN 1992-1 quality control instructions for cast-in-place concrete. These grouting
tasks require a quality control procedure for a load-bearing concrete structure.
1. Manufacturing
markings
The beams feature manufacturing markings:
- CE marking according to EN 1090-1 for steel parts.[1]
- ANSTAR Oy’s code
- Beam code and weight
2. Materials
The manufacturing materials used meet the following EN standards:
- Web and flange plates EN 10025 S355J2+N
- Reinforcement EN 10080 B500B
- Concrete grouting inside the housing minimum C32/40 class 2
3. Manufacturing
method
- Beams are manufactured according to EN 1090-2 in execution classes EXC2
and EXC3. [2]
- Welding class C, EN ISO 5817. [11]
- Rebar welding EN 17760-1. [16]
4. Surface
treatment
- The lower flange, 50 mm of the web and the end plate are painted.
- Painting: EN ISO 12944-5 A60 machine shop priming – FeSa2.5. [12]
- By special order only, hot-dip galvanisation according to EN-ISO 1461.
Service life design more specifically in Section 5.6
4 COMPOSITE BEAM DESING CRITERIA
4.1 Design and manufacturing standards
1. Finnish European standards:
The beams are designed according to the following standards:
SFS-EN 1991-1+NA Actions on structures. Part 1-1: General actions. [5]
SFS-EN 1992-1+NA Design of concrete structures. Part 1-1: General rules and rules for
buildings. [6]
SFS-EN 1993-1-1+NA Design of steel structures. Part 1: General rules and rules for buildings. [7]
Concrete Code Card No. 18EC (SFS-EN 1992-1-1) 31 July 2012. Designing a hollow-core slab
floor system supported by a beam. [20]
2. Other countries in the European Standards area
The beams are designed according to the following EN standards:
Basic Eurocode EN-1992-1-1:2004/AC:2010
Sweden SS-EN 1992-1-1:2005/AC:2010+A1/2014
Germany DIN-EN 1992-1 +NA/2013-04
3. Beam manufacture
Manufacture according to EN 1090-2 in execution class EXC2 or EXC3. CE marking according
to EN 1090-1, with CE marking certificate 0416-CRP-7247-03.
The standards followed in manufacture and erection are:
EN 1090-1 Execution of steel structures. Part 1: Requirements for conformity assessment of
structural components. [1]
EN 1090-2 Execution of steel structures. Part 2: Technical requirements for steel structures.
Execution classes EXC2 and EXC3. [2]
EN 13670 Execution of concrete structures. Execution class 2 or 3. [17]
EN ISO 5817 Welding. Fusion-welded joints in steel, nickel, titanium and their alloys. [11]
EN 17760-1 Welding. Welding of reinforcing steel. Part 1: Load-bearing welded joints. [16]
A-BEAM W
Design Instructions 10
Design Instructions A-BEAM W Revision 6/2017
4.2 Composite beam design instructions for the main structural engineer
4.2.1 Applications for the beams
The beams are used particularly for winter construction as load-bearing structures for hollow-core
slab floors in office, commercial, public and industrial buildings as well as multi-storey car parks.
Connections to the side of vertical structures are made using AEL and AEP hidden brackets. Typical
applications include the following frame systems:
1. Concrete element and mixed frame systems
The columns are multi-storey reinforced concrete columns, and the floors are made of hollow-
core slabs. The beam is designed as a single-span structure and connected to a concrete column
using an AEP bracket. In roofs, a multi-span, continuous structure going past the column can be
used, in which case the coupler connection is located in the field. Similarly, a continuous or
cantilever structure can be used in mezzanine floors when the column ends below the floor.
Connections through the column are not recommended.
2. Composite frame systems
The columns are multi-storey composite tubular columns, and the floors are made of hollow-
core slabs. The beam is designed as a single-span structure and connected to a composite
column using an AEL bracket. In roofs, a multi-span, continuous structure going past the
column can be used, in which case the coupler connection is located in the field. Similarly, a
continuous or cantilever structure can be used in mezzanine floors when the column ends below
the floor. Connections through the column are not recommended.
There may be a structurally reinforced surface casting on top of the hollow-core slab, or the surface
may be created using filler or without a surface structure. The bending resistance of the structure can
be significantly increased by design a reinforced surface slab to produce a composite effect as part of
the load-bearing structure of the beam.
4.2.2 Selecting the Abeam as the building’s floor beam
The beam is selected as the load-bearing structure for the building’s hollow-core slab floor for a
design-and-build query as follows:
1. Hollow-core slab
The hollow-core slab is designed according to the loads on the floor and the span length of the
slab, taking into account that it is supported on a flexible lower flange.
2. Beam cross-section
The cross-section dimensions are selected according to the hollow-core slab height and column
width. Preliminary design is carried out using the ABeam software, which can be downloaded
from our website. The software performs preliminary design of the cross-section according to
the hollow-core slab selected. The software also designs the shear resistance of the slab’s ribs
according to Concrete Code Card 18EC.
3. Hidden bracket suitable for the beam
Connections to concrete columns are made using AEP hidden brackets and connections to
concrete-filled composite tubular columns using AEL hidden brackets. The software selects the
hidden bracket suitable for the purpose.
Connections transferring reactive moment cannot be formed using AEP and AEL hidden
brackets. Structurally, it is not allowed to create a situation in which a hidden bracket
connection transfers reactive moment. Vertical angle change must be allowed for the hidden
bracket connection after joint grouting and surface casting such that the top surface of the
bracket’s tongue acts as the pivot point of the connection. The space between the end plate and
the column must not be grouted full.
A-BEAM W
Design Instructions 11
Design Instructions A-BEAM W Revision 6/2017
4.3 Structural function of the composite beam
4.3.1 Functional cross-section of the structure
Together with the concrete of the housing, the joint grouting and the concrete of the surface slab and
hollow-core slab’s top rib, the housing structure forms a composite structure whose functional cross-
section includes the following parts of the floor structures:
1. Surface slab ≥40 mm with sufficient transverse reinforcement
When the surface slab has sufficient reinforcement, the functional cross-section consists of the
concrete structures in the hatched area of the figure. Filling of the hollow core is not included in
calculating the functional cross-section. It is used for calculating the shear resistance of the
hollow-core slab’s ribs. The surface slab reinforcement spreads the splitting caused by floor
deflection and slab end torsion to a wider area, preventing uncontrolled splitting of the surface
slab. The pieces of steel on the top surface of the beam are only grouted in connection with the
surface slab.
Figure 8. Functional cross-section of the structure, reinforced surface slab
2. Surface slab ≥ 40 mm without transverse reinforcement
When the surface slab has no transverse reinforcement, the functional cross section consists of
the concrete of the surface slab between the ends of the hollow-core slabs. In this case, it must
be taken into account that the load deflection of the hollow-core slab causes splitting in the
surface slab in the area between the end of the slab and the web. In particular, this must be
considered when selecting the floor surface material. The pieces of steel on the top surface of
the beam are only grouted in connection with the surface slab.
Figure 9. Functional cross-section of the structure, non-reinforced surface slab
3. Surface slab with 10–30 mm filler
The functional cross-section of the structure consists of the concrete of the joint in an area the
width of the ends of the hollow-core slabs. In this case, it must be taken into account that the
load deflection of the hollow-core slab causes splitting in the filler of the slab in the area
between the end of the slab and the web. This must be considered when selecting the floor
surface material. The joint grouting – and the filler, if necessary – must provide the pieces of
steel on the top surface of the beam with sufficient fire and corrosion protection.
A-BEAM W
Design Instructions 12
Design Instructions A-BEAM W Revision 6/2017
Figure 10. Functional cross-section of the structure with a 10–30 mm filler layer
4. Hollow-core slab floor without surface structure
The functional cross-section of the structure consists of the concrete of the joint in an area the
width of the ends of the hollow-core slabs. In this case, it must be taken into account that the
load deflection of the hollow-core slab causes splitting in the filler of the slab in the area
between the end of the slab and the web. The joint grouting must provide the pieces of steel on
the top surface of the beam with sufficient fire and corrosion protection.
Figure 11. Functional cross-section of the structure without a surface structure
4.3.2 Design loads and load combination
The resistance values of the structure are calculated taking into account the development of the load
history from erection to the final stage. It is also taken into account that structures are connected to
the load-bearing cross-section at different times. The loads and load combination are specified
according to the following principles:
5. Consequence class and execution classes
In the design, the consequence class and reliability class are the same as for the building frame,
and the manufacture execution classes are accordingly determined as follows:
Table 4. Consequence and reliability classes as well as manufacture execution classes
Consequence class/
reliability class
Steel structure’s
execution class
EN 1090-2
Concrete structure’s
execution class
EN 13670
Note:
CC1/RC1 EXC2 Execution class 2
CC2/RC2 EXC2 Execution class 2 Standard delivery
CC3/RC3 EXC3 Execution class 3
6. Load during erection
The design load during the erection stage is the dead koad of the hollow-core slab with joint
grouting and a load of 0.5 kN/m2. Other loads during erection are possible, and information on
these must be specified in the design-and-build deal drawings. The moment of design during the
erection stage: The joints and housings have been grouted but the grouting has not hardened yet.
A-BEAM W
Design Instructions 13
Design Instructions A-BEAM W Revision 6/2017
7. Erection support
The beam can either be erected without erection support or be supported for hollow-core slab
loads during erection. Erection support is provided according to the following principles:
1. No erection supports
The beam and its connections and load-bearing vertical structures withstand loads during
erection as well as the torsional moment from the hollow-core slabs and the additional
torsion caused by the play of the brackets.
2. Erection supports at the end of the beam
The erection support eliminates torsion to the connection during erection and prevents
additional torsion caused by the play of the brackets.
3. Erection supports on the beam span
Deflection and torsion of the beam during erection are limited by means of erection
supports placed at the third-points to reduce the torsion transferred to the end
connections.
Erection support is presented in more detail in Section 3.3 of the erection instructions. Anstar
also provides project-specific instructions for beam-specific erection support on the site.
8. Design for the final stage
The beam acts as a composite structure for loads during the final stage. The design takes into
account that the various structures (including the surface slab) and loads are connected to the
functional cross-section at different times. The design is performed using software.
9. Dimensioning for fire situations and suspension and torsional steel
Beams can be designed up to fire resistance class R180 without fire protection of the lower
flange. In a fire situation, the hollow-core slab is suspended on the top surface of the beam using
pieces of suspension steel. For intermediate beams, the pieces of steel go over the beam, and for
edge beams, the steel is anchored in the grouting of the beam’s top surface. The torsional steel
going through the beam ties the torsion caused by the eccentric load of the hollow-core slab to
the beam.
10. Design for accident situations
If necessary, a design analysis for accident situations can be performed according to EN 1992-1-
1, Section 2.4.2.4, by using the partial safety factors in accident situations indicated in Table
2.1N of the standard to determine the resistance of the structure in exceptional situations. [6]
11. Dynamic loads and earthquake loads
Loads including dynamic effects are taken into account according to EN 1990-1, Section 4.1.5,
with the corresponding increased partial safety factors for loads. Earthquake design is taken into
account in the load combination according to EN 1991-1[5]. The partial safety factor level is
selected in accordance with the European standard.
12. Fatigue actions
The beam has not been designed for fatigue actions. Fatigue design is performed separately on a
case-specific basis according to the principles in EN 1990-1, Section 4.1.4. [4]
13. Using the beams at low temperatures
The impact strength of standard materials is tested at –20 oC. At operating temperatures lower
than this, the material requirement must be increased in the reference plans.
A-BEAM W
Design Instructions 14
Design Instructions A-BEAM W Revision 6/2017
4.3.3 Structural design of the composite beam
The following principles must be taken into account in the structural design details:
1. Circular reinforcement
The hollow-core slab floor is stiffened into a functional plate structure using circular
reinforcement. The circular reinforcement is designed according to EN 1991-1-7. It is designed
by the main structural designer.
The reinforcement is located in the joint between the web and slab, above the suspension steel.
The reinforcement transfers the loads from the plate stiffening to the vertical stiffeners. AEP
and AEL hidden bracket connections have been designed for horizontal load during erection.
This longitudinal resistance of the connection is intended for exceptional erection stage loads
when the circular reinforcement is not functioning yet. In the final stage, the brackets must not
be included in calculating the functional horizontal stiffening.
At the same time, the pieces of torsional steel act as part of the circular reinforcement, tying the
hollow-core slabs to each other through the housing. The design is performed according to EN
1991-1-7. [5] The torsional reinforcement calculated by the software does not include the
catastrophe design required by the standard.
2. Ensuring the joint action of the hollow-core slab with the W-type composite beam
The ABeam software designs the shear resistance of the hollow-core slab’s ribs according to
Concrete Code Card 18EC. The joint action can also be checked using the Flexibl software
available from the Elementtisuunnittelu.fi website. The final resistance analysis of the hollow-
core slabs always belongs to the slab supplier.
3. Filling of the hollow core
The resistance of the profile does not normally require additional filling of the hollow cores
other than for the minimum length required by Concrete Code Card 18EC. Additional filling of
the hollow cores is required in order to increase the shear resistance of the slab’s ribs; the slab
designer provides instructions for this.
With additional filling of the hollow cores, the shear resistance of the hollow-core slab’s ribs
can be significantly increased compared to standard filling, resulting in substantial savings in
the slab’s structure. The additional filling can be designed with the ABeam software.
4. Surface slab reinforcement
Reinforcing the surface slab significantly increases the bending resistance of the structure. The
surface slab is designed to produce a composite effect together with the rest of the structure
when the slab thickness is at least 40 mm. Transverse reinforcement is placed in the surface
slab, also evening out the cracks in the surface slab and ensuring the composite effect. The
surface slab reinforcement significantly improves the shear resistance of the hollow-core slab’s
ribs.
5. Splitting of the surface slab
Deflection of the hollow-core slab causes torsion at the slab’s support, causing cracks in the
joint grouting between the end of the hollow-core slab and the housing. The effect of the cracks
must be taken into account in selecting the surface structures. The cracks cannot be prevented,
but they can be limited by using, for example, a reinforced surface slab or flexible floor surface
materials, allowing for splitting of the surface slab at the end of the hollow-core slab.
6. Vertical separation of the surface slab
The surface slab tends to move away from the top surface of the beam due to the deformation
caused by the slab’s loads and deflection. To eliminate this phenomenon, the surface slab is cast
such that it touches the steel pieces on the top surface, which must not be grouted in connection
with joint grouting. This procedure is not necessary when using surface filler.
A-BEAM W
Design Instructions 15
Design Instructions A-BEAM W Revision 6/2017
7. Removing moisture from inside the housing
The housing is filled with concrete at the machine shop, in warm conditions, and the concrete
hardens before transport. The moisture is removed through the grouting openings in the beam’s
upper flange. However, the final drying of the inner parts of the housing must be taken into
account in scheduling the manufacture of the surface structures.
8. Structure’s service life and durability design
Service life and durability design is performed according to the instructions in EN 1992-1. The
surface treatment and protection requirements are specified in Section 5.7 of this manual.
Durability design must be performed separately for the upper and lower structures of the
housing if they have different exposure classes.
9. Division of responsibilities and allocation of tasks in designing connections
The following allocation of tasks, division of responsibilities and information transfer methods
are followed in designing connections connected to load-bearing structures of the building.
Table 5. Division of responsibilities and allocation of tasks relating to connections
Connections to
load-bearing frame
Main structural designer’s tasks
and responsibilities
Anstar Oy’s tasks and
responsibilities
1. Bracket
connection to
concrete column
- Selects the connection type and
preliminary bracket type and size.
- Responsible for placement of the
bracket’s column component as
well as the bracket’s
supplementary reinforcement in
the concrete column.
- Responsible for fire protection of
the bracket.
- Calculates the bracket’s final
forces during the erection stage
and final stage and confirms
the size of the bracket selected.
- Specifies the erection supports
necessary.
- Provides load data for the
connection.
2. Bracket
connection to
composite
column
- Selects the connection type and
preliminary bracket size.
- Responsible for placement of the
bracket’s column component in
the composite column,
supplementary reinforcement and
welding the bracket to the column
surface.
- Calculates the bracket’s final
forces during the erection stage
and final stage and confirms
the size of the bracket selected.
- Specifies the erection supports
necessary.
- Provides load data for the
connection.
3. Bolt connections
on top of a
column or wall
- Selects the connection type and
preliminary bolt dimensions.
- Performs final design of the
connection using forces received
from the beam design unit.
- Responsible for bolt design in the
concrete structure.
- Calculates the final forces on
the connection during the
erection stage and final stage.
- Provides the main structural
designer with data on the
forces on the connection.
- Designs the necessary
provisions for the beam.
4. Welded
connection to a
mounting plate
on top of a
column or wall
- Selects the connection type and
mounting plate dimensions.
- Performs final design of the
connection using forces received
from the beam design unit.
- Responsible for design of the
mounting weld of the mounting
plate and end plate in the
concrete structure.
- Calculates the final forces on
the connection during the
erection stage and final stage.
- Provides the main structural
designer with data on the
forces.
- Designs the necessary
connection provisions for the
beam.
5. Coupler
connection in the
field, secondary
beam connection
- Preliminary placement of coupler
connections.
- Connections are taken into
account in designing the rest of
the floor structure.
- Designs and implements the
connections on the beams.
6. Other special
connections
- The division of responsibilities
must always be agreed case-
- If necessary, Anstar delivers
data on the forces loading the
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specifically in the detail design
phase.
connection.
- Anstar manufactures the
connection pieces needed for
the beam.
10. Ensuring the joint action of the hollow-core slab with the composite beam
The beam cross-section produces a composite effect together with the joint grouting and the end
of the hollow-core slab. Structures producing a composite effect are presented in figures 8–11.
Anstar designs the composite effect of the beam using preliminary hollow-core slab data. The
final design of the shear resistance and composite effect of the slab’s end belongs to the hollow-
core slab supplier.
The beam’s joint action with the hollow-core slab can be confirmed with the Flexibl 8.37
software version, which includes the latest beam profiles of the A-BEAM S and A-BEAM W
types. If necessary, during the project implementation phase, Anstar can check the joint action
of the hollow-core slab using the final material and cord data received from the slab supplier.
11. Support for hollow-core slab floor openings
A new support structure has been made of the S-type beam for supporting the end of a hollow-
core slab in a floor opening. The new support is a composite column application to be cast in
connection with the slab’s joint grouting. The length of the support can be selected freely
according to the width of the floor opening, and the span lengths of the bracket are within the
range of 1200–4800 mm. The resistance of the bracket is sufficient for normal hollow-core slab
loads and span lengths, and its fire resistance without protection can be implemented up to
R180.
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5 COMPOSITE BEAM DESIGN
5.1 Design-and-build deal
Design phases:
Anstar is responsible for designing and manufacturing the beams as part of a design-and-build deal.
Our technical support will provide assistance with questions arising in various phases of the design
process. The design responsibilities in the design-and-build deal are as follows:
1. Allocation of design tasks in the bidding phase
Main structural designer Anstar Oy
- Comparing frame options
- Preliminary design of floor structures
- Preliminary design of the beam
- Preliminary design of the hidden bracket
type
- Preliminary detail design
- Preliminary connection design
- Service life design
- Query material for the design-and-build
deal
- ABeam software
- Technical support
- Technical assistance in design the beam
- Hidden brackets and their operating instructions
- Connection type details
- TS components
- Bid calculation and preliminary inspection of the
floor’s joint action
2. Allocation of design tasks in the implementation phase
Main structural designer Anstar Oy
- Updating structural plan drawings
- Designing the circular reinforcement of
the slab
- Updating detail drawings
- Designing beam connections to concrete
structures
- Service life and durability design
- Beam design and strength calculation
- Manufacturing drawings
- Data for the hollow-core slab designer
- Information about structural and connection
detail updates
- Providing concrete structure design with data on
the forces on the connections
3. Preparation and construction
Main structural designer Anstar Oy
- Having plans approved by building
control
- Supplementing the erection plan
- Quality control plan
- Beam manufacture and delivery
- Erection instructions, A-BEAM W [23]
- Additional instructions for erecting the beams
- Instructions for providing the beams with
erection supports
4. Initial data for design as part of the design-and-build deal
For implementation planning, the following information is needed from the main designer:
1. Structural plan
drawings
- Structural plan drawings and preliminary beam codes
- Design standard and reliability and consequence class
- Execution class according to EN 1090-2
- Structure class of concrete structures according to EN 1992-1-1
- Floor loads, provisions, fire resistance class information and floor
openings
- Floor surface structure types and wall connection data to floor, structure
sections
- Column locations, materials and final dimensions
- Preliminary connection detail data and connection types
2. Initial data for
the beam
- Service life and durability data as well as surface treatment requirements
- Any special manufacturing tolerances
- Jaw removals: length, width and location
- Other perforation: size and location
- Equipment suspensions and other mounting provisions
- Other special requirements
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5.2 ABeam software for composite beams
The ABeam software for preliminary design can be downloaded from our website. The software can
be used for designing the beam for a design-and-build deal query. The software can be used on
Windows 7 and 10. The user interface structure of the software is shown in Figure 12.
1. Software user interface
In the main window, the software shows the beam’s cross-section according to the initial data
provided. The Cross-section data buttons are used to select the initial data windows below the
figure.
The following initial data is specified for the calculation:
Select the general calculation data, location of the beam on the
intermediate or edge line and erection support of the beam. Also specify
the load range of the beam.
Select the hollow-core slab type and materials to be used as well as the
erection support of the slabs on the beam flange.
Select the surface structure and materials of the hollow-core slab. Select
the weight class and cross-section of the beam to be calculated from the
standard profile library.
Figure 12. User interface structure of the ABeam software
The Results buttons are used to view the results of the calculation. A green check mark in the
button means acceptable utilisation rates for all the quantities, and a red check mark means that
the utilisation rate has been exceeded for some calculation value. The calculation results are
presented in the following situations:
The window shows the power quantities during the erection stage and their
utilisation rates when the joint grouting of the floor has been performed but
has not hardened yet.
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The window shows the power quantities in the ultimate limit state, deflection
in the serviceability limit state, design for fire situations and the utilisation
rates of the quantities. Loads at the final stage.
The software calculates the shear resistance of the ribs at the hollow-core
slab’s end according to Concrete Code Card 18EC.
The utilisation rates of the most important quantities for bending
moment and shear resistance of the hollow-core slab’s ribs are shown at
the bottom of the window. If these are green, all resistance values are
OK. The deflection must be checked separately.
2. Selecting the calculation standard
At the beginning of the calculation, create a project folder in the File/Project folder menu.
When creating a project folder, you select the calculation standard used by the software for the
folder. When you perform a new calculation later and select this project folder, the calculation
standard copied to the folder will be used. To change the standard, create another project folder.
The calculation standard is shown as an icon in the bottom left corner. The software remembers
the folder and standard last used.
The following standards are available:
EN 1992-1-1:2004 Basic Eurocode
SFS-EN 1002-1-1:2005+NA Finnish Eurocode + NA
SS-EN 1992-1-1:2005/AC:2010+A1/2014 Swedish Eurocode + NA
DIN-EN 1992-1-1:2011-01+A1/2014 German Eurocode + NA
3. General data of beam
By selecting General data of beam, you can provide general data for the calculation. Figure 13.
1. Location of beam Select either intermediate beam or edge beam. The structure of the top
window changes correspondingly.
2. Span of beam Specify the span length to be calculated. This is usually the distance
between the beam’s end plates.
3. Spans of slabs/
4. distance to edge
Specify the distance to the centre of the adjacent line or to the outer edge
of the floor. This determines the beam’s load range.
5. Erection support Specify the use and location of erection supports and the erection order of
hollow-core slabs. There are three options available:
1. No erection supports
2. Erection supports are located under the jaw at the ends of the beam.
The torsion to the bracket and the torsion of the connection are
eliminated.
3. Erection supports are located on the beam of the span and the
distance of the support is specified. This reduces deflection and
torsion during erection.
4. Floor system
This window is used to specify the data of hollow-core slabs separately for each side of the
beam. The hollow-core slab material selections are used for calculating the composite effect of
the structure as well as the shear resistance of the slab’s ribs in accordance with Concrete Code
Card 18EC.
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Figure 13. Information on the hollow-core slab
5. Beam cross-section
This window is used to select the surface slab type, materials and possible reinforcement and the
cross-section to be used. The structure of the window changes according to the surface slab type
selected. This window is used to check that the selected cross-section fits the structure being
designed.
1. Type of top slab There are four surface structure options to choose from.
2. Structure of top
slab
Select the thickness and materials of the surface slab and specify whether
the surface slab is taken into account in the calculation as a composite
structure.
3. Transverse
reinforcement
Select the surface slab reinforcement.
4. Height of the beam Two height options are available for the W type.
5. Type of the beam There are three different weight classes to choose from. The cross-section
– light L, normal N or heavy H – determines the bending resistance of the
profile.
6. Choose cross-
section of beam
The cross-section is selected from the database according to the height and
width. The window shows the structure of the cross-section with the
hollow-core slabs.
7. Elevation parts Elevation parts can be used to adjust the beam height for hollow-core slabs
of various heights.
8. Joint concrete Select the strength of the concrete of the joint and housing.
Figure 14. Surface slab and profile cross-section data
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6. Loads
Figure 15 shows the dead and live loads specified for the slab. The software calculates the self-
weights of all the structures displayed in the top window, so these are not specified. The load
can be either uniform or trapezoidal and for either part of the slab or the entire slab.
Figure 15. Loads on the slab
7. Design the beam cross-section
The software performs the following design for the beam:
1. Erection stage For the erection stage, the software calculates the ultimate limit state
resistance before hardening of the housing and joint grouting as well as the
bracket resistance at the erection stage, which can be influenced by means
of erection support.
2. Final stage For the final stage, the software calculates the ultimate limit state
resistance as well as the bracket utilisation rate for final loads. The
software selects the smallest AEL hidden bracket according to the loads
specified and the dimensions of the beam. In the beam design, Anstar
checks the final resistance of the bracket.
3. Fire situation Fire situation resistance is calculated using the fire situation loads
specified in the load data, with the lower flange no longer acting in the
structure.
4. Shear resistance of
the ribs at the
hollow-core slab’s
end
The software calculates the shear resistance of the ribs at the hollow-core
slab’s end in composite effect with the beam according to Concrete Code
Card 18EC. The resistance can be increased by filling of the hollow cores,
concrete strength and reinforcement of the surface slab. This preliminarily
determines the suitability of the hollow-core slab for the case. The
software does not calculate the bending resistance of the hollow-core slab
or determine the final cording required.
5.3 Joint action of the composite beam and hollow-core slab
5.3.1 Placement of the hollow-core slab
The following must be taken into account in designing the connection between the housing profile
and the hollow-core slab:
1. Supporting the hollow-core slab on the lower flange
The theoretical clearance of the end of the hollow-core slab from the web is 30 mm with the W-
type beam. The slab’s support surface has the following values:
- For hollow-core slabs OL200–OL370, the support surface is 80 mm, minimum value 65
mm.
- For hollow-core slabs OL400–OL500, the support surface is 105 mm, minimum value 100
mm.
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In the support surface width, the manufacturing tolerances of the hollow-core slab’s length must
be taken into account as a factor reducing the support surface. Figure 16 shows the standard for
placing the hollow-core slab on the lower flange.
2. Concrete filling of the hollow cores and shear resistance of the ribs
In terms of strength engineering, the functioning of the structure does not require concrete
filling of the hollow cores for a length greater than the basic value indicated in the Concrete
Code Card. Additional filling of the hollow cores is required when the shear resistance of the
slab’s concrete ribs is not sufficient in the joint action analysis in accordance with Concrete
Code Card 18EC.
In connection with the final design, Anstar checks the shear resistance of the slab’s ribs,
ensuring acceptable joint action of the housing and hollow-core slab. The ultimate responsibility
for design the slab rests with its supplier, who performs the calculations using the final structural
values of the hollow-core slab.
Figure 16. Dimensions for placing the hollow-core slab on the lower flange
3. Hollow-core slabs of different heights and elevations
The software can also be used for calculating hollow-core slabs of different heights whose top
surfaces are not level with each other. The design is performed for all surface slab options. With
long span lengths, the profile can also be elevated using elevation parts on the lower flange.
5.3.2 Addition steel for the beam
Torsional steel in accordance with Figure 17 is placed in the cross-section for the joint action of the
housing profile and hollow-core slab.
1. Suspension steel
In a fire situation, hollow-core slabs are suspended by pieces of suspension steel in the slab
joint. For intermediate beams, the pieces of steel go over the beam, and for edge beams, the
steel is either taken behind the beam into the bay or anchored on top of the beam by bending in
the direction of the beam. These pieces of suspension steel are designed by Anstar and are part
of the site acquisitions. The blue bar in figures 17 and 18.
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Figure 17. Suspension and torsional reinforcement of the beam. Principle drawing of an
intermediate beam
2. Torsional steel
The torsional steel is used to tie the torsional moment caused by the hollow-core slab’s eccentric
support to the beam. The torsional steel is taken through the beam in the tube provided at the
hollow-core slab’s joint. These pieces of torsional steel are designed by Anstar Oy and are part
of the site acquisitions. The red bar in figures 17 and 18.
Figure 18. Suspension and torsional reinforcement of the beam. Principle drawing of an edge
beam
3. Circular steel for the hollow-core slab floor
Pieces of circular steel are placed in the joint grouting between the hollow-core slab and the
housing and are designed to combine the hollow-core slab floor into a plate stiffening the
building, transferring the horizontal loads to the vertical stiffening.
Figure 19. Torsional reinforcement of the centre and edge line
The hidden bracket and other standard connections transfer the horizontal force on the frame
before the hardening of the joint grouting by their horizontal force resistance, and this can be
used to ensure the stability of the frame during erection. During the final stage, all horizontal
forces are transferred using these pieces of circular steel. The circular steel is designed by the
main structural designer.
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5.3.3 Grouting for the structure
The housing acts as a composite structure with the hollow-core slab when all grouting has hardened.
The joint action of the housing profile and slab as a composite structure is influenced by the
following concrete grouting:
1. Grouting inside
the housing
The housing is filled with concrete at the machine shop. The housing grouting
acts as part of the load-bearing structure during erection, and quality control of
the concrete is carried out according to the requirements for structural concrete.
2. Grouting of the
joint between the
hollow-core slab
and housing
Joint grouting of the hollow-core slab is performed once the pieces of additional
steel have been erected. Grouting is performed by simultaneously grouting the
longitudinal joints of the slab and the joint between the housing and slab up to the
top surface of the floor. The top surface of the beam is not yet grouted at this
stage.
3. Surface casting of
hollow-core slab
The surface or filler casting of the hollow-core slab floor is performed after the
joint grouting has hardened and dried.
5.3.4 Surface casting of the hollow-core slab
Structurally, there are four different ways of performing the surface casting of the hollow-core slab
floor, and this influences the structural function of the beam. The surface casting options are:
1. No surface casting
Such structures include roofs and parking deck floors, where water and thermal insulation layers
are placed on top of the slab. There must be a sufficient layer of protective concrete for
corrosion and fire protection of the top surface rebar. The top surface of the beam is grouted up
to the level of the top surface of the slab in connection with the joint grouting.
Figure 20. Joint grouting of the structure in the roof without a surface slab or bay
2. Surface structure consists of 10–30 mm filler casting
Such structures include intermediate floors of residential buildings and other structures only
requiring a thin layer of filler on top of the slab. Light floor surface structures are placed on top
of the filler. The filler must also protect the pieces of steel on the top surface of the beam against
fire and corrosion. The top surface of the beam is grouted up to the level of the top surface of
the slab in connection with the joint grouting.
Figure 21. Joint grouting of the structure in the intermediate floor with 10–30 mm surface filler
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3. Surface structure is at least 40 mm reinforced concrete
Such structures include intermediate floor slabs of office and public buildings, where the span
lengths are long, and the floor requires surface casting for the floor surface structures.
Reinforcement mesh is placed in the surface casting to even out cracks caused by deflection of
the hollow-core slab. The top surface of the beam is not grouted during joint grouting but is
only grouted in connection with the surface slab. The surface slab provides fire and corrosion
protection for the pieces of steel on the top surface.
Figure 22. Joint grouting of the structure in the intermediate floor with a structural surface slab
4. Surface structure is a bay on top of the beam
A reinforced concrete topping bay can be used in the roofs of buildings to significantly increase
the bending resistance of the structure. The bay is located in the thermal insulation space of the
structure, also protecting the upper flange of the beam against fire and corrosion. The bay is
grouted in connection with the joint grouting of the slab.
Figure 23. Joint grouting of the structure in the roof with a reinforced surface casting bay
5.4 Composite beam connections
5.4.1 Standard connections of the beam
The beam can be connected to the side of a concrete and composite column and on top of a concrete
wall and column using hidden bracket and anchor bolt products. There is a library of standard
connections that can be used to implement the most common types of connections. Standard
connections to load-bearing vertical structures are described below.
5.4.2 Hidden bracket connection to a concrete column
The beam’s standard connection to a concrete column or concrete wall is the AEP hidden bracket.
The resistance values and more detailed design instructions for the brackets are provided in the user
manual for AEP hidden brackets.[20]
1. Dimensions for placing the composite beam and AEP hidden bracket in a concrete column
The web width of the beam must be selected for intermediate and edge beams such that the
bracket is located on the centre line of the round column. In the beam, the hidden bracket is
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Design Instructions A-BEAM W Revision 6/2017
always located on the centre line. The bracket acts as a swivel joint, and it is not allowed
structurally to create a situation in which the connection transfers bending moment.
The height of the AEP bracket’s column component is determined such that the bottom surface
of the bracket’s front plate is level with the top surface of the lower flange. Figure 23 shows an
AEP bracket connection to a concrete column.
Compatibility of the AEP hidden bracket with the A-BEAM W standard beam by size class A200 A265 A320 A370 A400 A500
AEP400
AEP600
AEP800
AEP1100
Figure 24. AEP bracket connection to a concrete column
5.4.3 Hidden bracket connection to a composite column
The standard connection of the composite beam to the side of a composite tubular column is the AEL
hidden bracket. The resistance values and more detailed design instructions for the brackets are
provided in the user manual for AEL hidden brackets.[22]
1. Dimensions for placing the beam and AEL hidden bracket in a composite column
The bracket is placed on the side of a steel column such that the connection is centred on the
column. The elevation of the AEL bracket’s column component is +45 mm from the bottom
surface of the hollow-core slab (= top surface of the lower flange). If using an elevated profile,
the bracket’s column component is placed at an elevation of +45 mm from the top surface of the
lower flange. For more information, refer to the user manual for the AEL hidden bracket.
Anstar Oy manufactures the AEL brackets and delivers them to the machine shop that
manufactures the composite column, where the bracket is welded to the surface of the
composite column. The AEL hidden bracket has been designed in the R60 fire resistance class
and has two dowel pins, which are placed in the concrete core of the composite column through
the tube. The composite column must be reinforced for the fire resistance class required.
Compatibility of the AEL hidden bracket with the A-BEAM W standard beam by size class A200 A265 A320 A370 A400 A500
AEL250
AEL400
AEL600
AEL900
AEL1200
AEL1500
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Figure 25. AEL bracket connection to composite column
5.4.4 Beam coupler connection in the field
The beam is designed as a continuous structure going over the column in the roof, meaning that the
coupler connection is located in the field near the origin of the bending moment. The coupler
connection in the field is made using a connection type in accordance with the AEL bracket. The
connection forms a swivel joint at the ends of the beam, and the connection clearance is 20 mm. The
connection requires normal fire protection according to the user manual for the AEL bracket. [22]
Figure 26. Beam coupler connection in the field and end plate connection to a primary beam
5.4.5 End plate connection to the side of another beam
When the load-bearing direction of a hollow-core slab changes in the adjacent field, a secondary
beam can be connected to the side of a primary beam using an end plate connection. The beam is
designed as a single-span structure, and the connection transfers the shear force and torsional
moment but not the bending moment. After mounting, the connection is ready to be loaded. Anstar
designs and delivers these connection pieces. Figure 26 shows the connection principle.
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5.4.6 Bolt connection on top of a column or wall
The beam can be connected on top of a column or wall using two AHP rebar bolts. The following
must be taken into account in designing the connection:
- The height of the connection is adjusted using fitting pieces made of neoprene or steel plate, and
they must allow for vertical torsion at the bolt and end plate.
- The vertical support reaction of the connection is transferred from the end plate through the
fitting pieces to the column.
- The grouting of the connection must not be performed such that the front edge of the column
starts transferring the shear force on the beam. No concrete is allowed under the lower flange.
The joint must be sealed with fire-resistant sealant.
- The connection can be used for transferring the beam’s torsional moment.
Force is applied to the bolt.
Nd = Vd /2 ± Mvd /p, where
Vd = Beam’s shear force
Mvd = Beam’s torsional moment
p = Distance between bolts
- The design values and reinforcement instructions for AHP rebar bolts are provided in the bolt
user manual [24].
Figure 27. Bolt connection on top of a column or wall with two bolts
5.4.7 Welded connection to a mounting plate on top of a column or wall
The beam can be connected on top of a column or wall by welding its end plate to a mounting plate
on the column. The following must be taken into account in designing the connection:
- If necessary, the height of the connection can be adjusted using fitting pieces made of steel
plate, which must first be welded to the mounting plate.
- The vertical support reaction of the beam is transferred from the end plate through the fitting
pieces to the mounting plate and the column.
- The joint grouting of the connection must not be performed such that the front edge of the
column starts transferring the shear force on the beam. No concrete is allowed under the lower
flange. The joint must be sealed with fire-resistant sealant.
- The connection transfers torsional moment, and the weld is design for the following forces.
Forces acting on the mounting plate weld:
Nd = Vd /2 ± Mvd /p, where
Vd = Beam’s shear force
Mvd = Beam’s torsional moment
p = Effective length of the weld, or if there are two welds, the distance between them.
The weld is design according to EN 1993-1-8.
- The connection solution is selected according to the dimensions of the load-bearing vertical
structures and the space available.
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Figure 28. Welded connection to a mounting plate on top of a column or wall
5.4.8 Additional fixings to the beam for building services on the site
Additional fixings can be made to the beam on the site for erections required by building services.
However, heavy equipment suspensions are implemented through beam design to provide the
structure with safe fixing points. Equipment suspensions can be welded on the lower flange, in the
area between the webs. Weld fixings of equipment supports can also be made on the upper flange.
Small pipes and other erections required by building services can be taken through the housing.
However, information about this must be delivered to detail design. Lead-throughs implemented on
the site are not possible.
On an edge beam, fixings can be made for temporary handrails if necessary. Figure 30 shows the
allowable fixing areas and typical handrail fixing detail.
Figure 29. Allowable fixing areas of the beam
5.5 Fire protection of the beam and connections
The beam and its connections are designed for the same fire resistance class as the frame. The beam
is design up to fire resistance class R180 without external fire protection of the lower flange. In a fire
situation, the load-bearing structure consists of the concrete of the housing with the stirrups and the
bottom surface rebar. In a fire situation, the suspension and torsional steel transfer the hollow-core
slab’s loads to the housing profile when the lower flange has no load-bearing capacity left. Fire
protection details for the beam and its standard connections are presented in Section 6 of the erection
instructions. [23]
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5.6 Service life design of the structure
Service life and durability design for concrete structures is performed according to the principles of
EN 1992-1. The requirements of EN ISO 12944 are applied for steel structures [12]. The analysis
must be performed separately for the top and bottom of the structure, particularly if they have
different exposure classes.
1. Durability of concrete and rebar
The concrete and pieces of rebar inside the housing have sufficient protection in each exposure
class. The nominal value for the concrete cover outside the housing is specified according to the
exposure class for the structural and rebar parts of the housing.
2. Durability of steel parts
Surface treatment of the steel parts left outside the concrete is carried out according to EN
12944-2 [12] by applying the instructions to the exposure classes of EN 1992-1 The
atmospheric corrosivity category according to EN 12944-2 and its requirements are only taken
into account in the surface treatment of the visible lower flange and the web against the exterior
wall.
The standard delivery is machine shop priming of the lower flange surfaces and the web at a
height of 50 mm. The other protection requirements are specified in the reference plans.
Table 6 shows the nominal value Cnom for the concrete cover of the structure’s supplementary
reinforcement or steel parts by exposure class according to minimum value Cmin,cur in EN 1992-1.
The nominal value for the concrete cover of the steel parts is Cnom = Cmin,cur + Δcdev (= 10 mm). Table
6 also shows the recommended minimum surface treatments and protection methods in various
exposure classes.
Table 6. Nominal value Cnom for the steel parts’ concrete cover and minimum surface treatment
Exposure
class EN
1992-1
Concrete
Codes
50-year
service
life
Cnom
mm
100-year
service
life
Cnom
mm
Surface treatment options and protection methods recommended
for the beam
Minimum requirement for
lower flange surface
treatment
Protection of the pieces of steel on
the top surface of the beam
X0 20 20 Machine shop priming. Finish
painting only for visible parts as
necessary. Specified in the
structural plans.
Minimum concrete cover requirement for
top surface rebar.
XC1 20 30 Machine shop priming.
Necessary finish painting
specified in the structural plans.
Minimum concrete cover requirement for
top surface steel parts.
XC3 35 45 Machine shop priming.
Necessary finish painting
specified in the structural plans.
Minimum concrete cover requirement for
top surface steel parts. Structural concrete
topping and waterproofing prevents water
from getting inside the beam.
XD1–XD3 50 60 The beams are hot-dip galvanised
according to the standard [13].
Torsional and suspension
reinforcement as well as circular
steel are hot-dip galvanised.
Beams are hot-dip galvanised. Structural
concrete topping and waterproofing
prevents water from getting inside the
beam.
XS1–XS3
XA1–XA3 XF1–XF4
– – The beams may only be used on the basis of site-specific special analyses. The
beam’s surface treatment, protection methods and concrete cover’s nominal
value are specified according to the site requirements.
A-BEAM W
Design Instructions 31
Design Instructions A-BEAM W Revision 6/2017
6 DESIGN-AND-BUILD DEAL DELIVERY DOCUMENTS
The standard delivery includes the following beam manufacturing documents and design data for
updating the structural plans:
Table 7. Documents included in the beam delivery
Documents and other design data
delivered to the main structural designer
Contents and purpose of the documents
1. Manufacturing drawings For building control
2. Beam strength calculations For building control
3. Beam table Data for updating structural plan drawings
4. Forces on bracket connections Final bracket and force data for designing adjoining concrete
structures.
5. Forces on other connections Final connection and force data for designing connections to
the beam and concrete structures.
6. Product approval information
This information can be found on our website
- CE marking certificate
- Quality control certificates
A-BEAM W
Design Instructions 32
Design Instructions A-BEAM W Revision 6/2017
REFERENCES [1] EN 1090-1 Execution of steel structures and aluminium structures. Part 1:
[2] EN 1090-2, Execution of steel structures and aluminium structures. Part 2: Technical requirements for steel structures.
[3] EN ISO 3834. Quality requirements for fusion welding of metallic materials. Part 1: Criteria for the selection of the
appropriate level of quality requirements, and parts 2–5.
[4] EN 1990, Eurocode. Basis of structural design.
[5] EN 1991-1, Eurocode 1. Actions on structures, parts 1–7.
[6] EN 1992-1-1, Eurocode 2. Design of concrete structures. Part 1-1: General rules and rules for buildings.
[7] EN 1992-1-2, Eurocode 2. Design of concrete structures. Part 1-2: General rules. Structural fire design.
[8] EN 1993-1, Eurocode 3. Design of steel structures. Part 1-10: General rules and rules for buildings.
[9] CEN/TS 1992-4-1 Design of fasteners in concrete – Part 4-1: General.
[10] CEN/TS 1992-4-2 Design of fasteners use in concrete – Part 4-2: Headed Fasteners.
[11] EN ISO 5817, Welding. Fusion-welded joints in steel, nickel, titanium and their alloys. Weld classes.
[12] EN ISO 12944, Paints and varnishes. Corrosion protection of steel structures by protective paint systems. Part 1-7:
[13] EN ISO 1461. Hot dip galvanized coatings on fabricated iron and steel articles.
[14] EN 10025, Hot rolled products of structural steels. Part 1: General technical delivery conditions.
[15] EN ISO 1684 Fasteners. Hot dip galvanized coating.
[16] EN 17760-1 Welding. Welding of reinforcing steel. Part 1: Load-bearing welded joints.
[17] EN 13670 Execution of concrete structures.
[18] EN 13225 Precast concrete products. Linear structural elements.
[19] EN 13369 Common rules for precast concrete products.
[20] Concrete Code Card No. 18EC (EN 1992-1-1) 31.7.2012 Designing hollow-core slabs supported on beams with dimensioning
example).
[21] Anstar Oy. AEP Bracket User Manual.
[22] Anstar Oy. AEL Bracket User Manual.
[23] Anstar Oy. A-BEAM W Erection Manual.
[24] Anstar Oy. ATP Rebar Anchor Bolts
LIST OF TABLES Table 1. A-BEAM W. Standard intermediate and edge beams ..................................................................................................... 5 Table 2. Intermediate beam dimensions ....................................................................................................................................... 7 Table 3. Edge beam dimensions ................................................................................................................................................... 8 Table 4. Consequence and reliability classes as well as manufacture execution classes ........................................................... 12 Table 5. Division of responsibilities and allocation of tasks relating to connections ................................................................. 15 Table 6. Nominal value Cnom for the steel parts’ concrete cover and minimum surface treatment ............................................. 30 Table 7. Documents included in the beam delivery .................................................................................................................... 31
PICTURES Figure 1. A-BEAM W composite beam in a building frame ........................................................................................................... 4 Figure 2. Structure of composite beams. Beam types W and S ....................................................................................................... 4 Figure 3. Intermediate floor structure, reinforced surface slab and surface filler ......................................................................... 6 Figure 4. Roofing structure, reinforced surface casting bay and hollow-core slabs of different heights ...................................... 6 Figure 5. Floor edge structure and level difference at the top surface of the slab ......................................................................... 6 Figure 6. Intermediate beam structure ........................................................................................................................................... 7 Figure 7. Edge beam structure ....................................................................................................................................................... 8 Figure 8. Functional cross-section of the structure, reinforced surface slab ............................................................................... 11 Figure 9. Functional cross-section of the structure, non-reinforced surface slab ....................................................................... 11 Figure 10. Functional cross-section of the structure with a 10–30 mm filler layer ....................................................................... 12 Figure 11. Functional cross-section of the structure without a surface structure .......................................................................... 12 Figure 12. User interface structure of the ABeam software ........................................................................................................... 18 Figure 13. Information on the hollow-core slab ............................................................................................................................ 20 Figure 14. Surface slab and profile cross-section data .................................................................................................................. 20 Figure 15. Loads on the slab .......................................................................................................................................................... 21 Figure 16. Dimensions for placing the hollow-core slab on the lower flange ............................................................................... 22 Figure 17. Suspension and torsional reinforcement of the beam. Principle drawing of an intermediate beam ............................. 23 Figure 18. Suspension and torsional reinforcement of the beam. Principle drawing of an edge beam ......................................... 23 Figure 19. Torsional reinforcement of the centre and edge line .................................................................................................... 23 Figure 20. Joint grouting of the structure in the roof without a surface slab or bay ..................................................................... 24 Figure 21. Joint grouting of the structure in the intermediate floor with 10–30 mm surface filler ................................................ 24 Figure 22. Joint grouting of the structure in the intermediate floor with a structural surface slab ............................................... 25 Figure 23. Joint grouting of the structure in the roof with a reinforced surface casting bay ......................................................... 25 Figure 24. AEP bracket connection to a concrete column ............................................................................................................. 26 Figure 25. AEL bracket connection to composite column .............................................................................................................. 27 Figure 26. Beam coupler connection in the field and end plate connection to a primary beam .................................................... 27 Figure 27. Bolt connection on top of a column or wall with two bolts ........................................................................................... 28 Figure 28. Welded connection to a mounting plate on top of a column or wall ............................................................................. 29 Figure 29. Allowable fixing areas of the beam .............................................................................................................................. 29
A-BEAM W
Design Instructions 33
Design Instructions A-BEAM W Revision 6/2017
Anstar Oy
Erstantie 2
FI-15540 Villähde, Finland
Tel. +358 3 872 200
Fax +358 3 872 2020
www.anstar.fi
Anstar Oy is a Finnish family business established in 1981. We offer concrete structure connections and composite structures manufactured in Finland for our customers worldwide. Created through innovative development work and using modern production
technology, our extensive product range speeds up construction and saves on costs. We take pride in our high-quality products and quick deliveries. Our products have the necessary official approvals, and external quality control is carried out
by Inspecta Sertifiointi Oy. We have been granted the ISO 9001 and ISO 14001 quality and environmental certificates. Our production is certified according to EN 1090-1 and EN 3834-2.
Joint solutions since 1981
JOINT SOLUTIONS FOR CONSTRUCTION