NCCI Initial Sizing of Simple End Plate Connections

NCCI: Initial sizing of simple end plate connections. SN013a-EN-EU

NCCI: Initial sizing of simple end plate connections.

This NCCI provides rules for the initial sizing of the components of end plate connections for a "Simple Joint". Both partial depth and full depth end plates are covered by this NCCI. The rules apply to a bolted connection using non-preloaded bolts (i.e. Category A: Bearing type bolted connection).

Contents

1. Typical connections 2

2. Choice of end plate connection 2

3. Choice of bolt type 3

4. Number of bolts in an end plate connection 3

5. End plate dimensions 4

6. Weld size 5

7. Other design issues 6

8. Limits of application 6

9. Background 6

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1. Typical connections End plates are used for beam/column and beam/beam connections. Typical connections using partial depth and full depth end plates are shown in figure 1.1. End plate connections may be considered as simple joints according to EN1993-1-1 5.1.2 (1) and (2) and EN1993-1-8 5.1.1 (1), (2) and (3). For further information about simple joints, see SN020.

(a) Partial depth end plates

(b) Full depth end plates

Figure 1.1 Typical Beam to Column and Beam to Beam connections, with partial depth and

full depth end plates.

2. Choice of end plate connection There are two basic types of end plate connections (see figure 1.1):

1. Partial depth end plate connection; where the end plate is welded only to the web of the supported beam.

2. Full depth end plate connection; where the end plate extends the full depth of the supported beam and is welded to the supported beam web and flange/flanges.

It is recommended that:

If either a partial depth or full depth end plate may be adopted RdC,Ed 75,0 VV

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If a full depth end plate should be adopted RdC,Ed 75,0 VV >

In the above expressions:

VEd is the design shear force and

VC,Rd is the design shear resistance of the supported beam, which, for the initial sizing, can be calculated using:

( )M0

b1y,b1w,b1RdC,

3

fthV

=

3. Choice of bolt type It is recommended to use one grade and one diameter of bolt in a limited range of lengths.

This document and the NCCIs for shear and tying resistance of end plate connections (SN014 and SN015) relate to non-preloaded bolts in Category A: Bearing type connections (as defined in EN1993-1-8 3.4.1). For this type of connection, the bolt class used usually depends on the country of construction: class 10.9 bolts are used in most of Europe, but class 8.8 bolts are used in UK and 6.8 bolts are used in France).

Generally bolts are fully threaded and the commonly used size is:

Bolt diameter 20 mm

Length 60 mm.

However, the verification procedures for end plate connections shown in SN014 and SN015 are valid for bolts from class 4.6 to class 10.9 with different diameter and length.

4. Number of bolts in an end plate connection The minimum number of bolts (M20, class 8.8) to be adopted is given by:

75EdVn = (rounded up to the nearest multiple of 2)

Where VEd is the design shear force in kN

For example if VEd = 350 kN

7,475

35075Ed === Vn

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Therefore, the minimum number of bolts is 6 (i.e. 3 rows of bolts)

If VEd = 400 kN

3,575

40075Ed === Vn

Therefore, the minimum number of bolts is 6 (i.e. 3 rows of bolts)

2

e1

e 2e p

e1

3

h p

bp

11(n -1) x p

n1 =number of horizontal rows of bolts

Figure 4.1 Typical end plate details

5. End plate dimensions It is recommended that the following are adopted:

a) For M20 bolts the following dimensions are recommended, depending on the depth of the supported beam.

Table 5.1 Thickness and width of end plate.

Depth of supported beam hb1

(mm)

End plate thickness tp

(mm)

End plate width bp

(mm)

Gauge p3

(mm)

hb1[500 8 or 10 150 90 hb1>500 10 200 140

b) For a partial depth end plate, the height of end plate hp should be such that:

b1

b1w,b1y,

Edp 6,0;

1900max htfVh and

b1p dh

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Note: Commonly the height of end plate is rounded up to the nearest 10 mm.

where:

db1 is the distance between fillets of the supported beam (mm)

fy,b1 is the yield strength of supported beam (N/mm2)

hb1 is the depth of the supported beam (mm)

hp is the height of the end plate (mm)

tw,b1 is the thickness of supported beam web (mm)

VEd is the design shear force (kN)

6. Weld size Adopt the following fillet weld sizes, depending on the supported beam steel grade and web thickness.

Table 6.1 Size of fillet weld for different supported beam steel grades and web thicknesses.

Dimensions, for supported beam web thickness tw,b1

9 mm 12 mm 15 mm

Supported beam steel

grade Throat a (mm)

Leg length s (mm)

Throat a (mm)

Leg length s (mm)

Throat a (mm)

Leg length s (mm)

S235 4 6 5,5 8 7 10

S275 4 6 5,5 8 7 10

S355 4 6 5,5 8 7 10

s

a

t p

t w,b1

Key: a: weld throat s: leg length

Figure 6.2 Fillet weld, throat and leg lengths.

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7. Other design issues The details given in this NCCI will provide sufficient ductility and rotation capacity to meet the requirements of Section 12 of SN014.

8. Limits of application This NCCI applies to two vertical lines of bolts (i.e. n2 = 2) using non-preloaded bolts for Category A: Bearing type bolted connection in accordance with EN1993-1-8 3.4.1.

9. Background The rules in this NCCI are based on:

(1) European recommendations for the design of simple joints in steel structures - Document prepared under the supervision of ECCS TC10 by: J.P. Jaspart, S. Renkin and M.L. Guillaume - First draft, September 2003.

(2) Joints in Steel Construction Simple Connections (P212). The Steel Construction Institute and The British Constructional Association Ltd., 2002.

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Quality Record RESOURCE TITLE NCCI: Initial sizing of simple end plate connections.

Reference(s)

ORIGINAL DOCUMENT

Name Company Date

Created by Edurne Nez The Steel Construction Institute

March 2005

Technical content checked by Abdul Malik The Steel Construction Institute

July 2005

Editorial content checked by D C Iles SCI 16/9/05

Technical content endorsed by the following STEEL Partners:

1. UK G W Owens SCI 16/9/05

2. France A Bureau CTICM 16/9/05

3. Sweden A Olsson SBI 15/9/05

4. Germany C Mller RWTH 14/9/05

5. Spain J Chica Labein 16/9/05

Resource approved by Technical Coordinator

G W Owens SCI 26/4/06

TRANSLATED DOCUMENT

This Translation made and checked by:

Translated resource approved by:

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1. Typical connections Figure1.1 Typical Beam to Column and Beam to Beam connections, with partial depth and full depth end plates.2. Choice of end plate connection 3. Choice of bolt type 4. Number of bolts in an end plate connection Figure4.1 Typical end plate details

5. End plate dimensions Table5.1 Thickness and width of end plate.

6. Weld size Table6.1 Size of fillet weld for different supported beam steel grades and web thicknesses.Figure6.2 Fillet weld, throat and leg lengths.

7. Other design issues 8. Limits of application 9. Background

Documents

NCCI Initial Sizing of Simple End Plate Connections