Upload
others
View
51
Download
7
Embed Size (px)
Citation preview
Posttensioned CFRP‐plates
StressHead - CarboStress
10. December 2019
14.Oct.2019 2
Schedule
Company StressHead Ltd System References
Bridge strengthening Industrial- and high-rise buildings Earthquake strengthening
Tests & Design Discussion
14.Oct.2019 3
Speaker
Dr. Gregor SchweglerDr. sc. techn. Dipl. Ing. ETH /SIACEO / Owner
Marcel ReyBSc. Ing. FHTechnical and Business Development Manager
14.Oct.2019 4
Company
Company established since 1999
Located in Switzerland (Lucerne)
International active Partner of Sika
14.Oct.2019 5
Experience
Switzerland
International
14.Oct.2019 6
System
Bridge strengthening Strengthening of industrial and high-rise buildings
Earthquake strengthening
14.Oct.2019 7
System
14.Oct.2019 8
System
Standard anchor Type III
Fixed anchor side movable anchor – tensioning side
P0 = 220kN
14.Oct.2019 9
System
Standard anchor Type III
Fixed anchor side movable anchor – tensioning side
P0 = 220kN
14.Oct.2019 10
System
StressHeadType StressHead 220Material CFRPWeight 550 gDimensions Ø 80 x 110 mm
PlateType SIKA CarboDur S626Material CFRPWeight 250 g/mDimensions 60 x 2.6 mm = 156 mm2
14.Oct.2019 11
System
Characteristics StressHead-CarboStress SystemPost-tensioning force FP0 = 220 kNGuarantied anchored force FPsk,min = 300 kNTendon testing in factory (if requested) P0 + 10% = 242 kN
Characteristics of Plate (SIKA CarboDur S626)Post-tension at FP0 = 220 kN σP0 = 1‘410 N/mm2
Tensile strength σu = 2'800 N/mm2
Post-strain at FP0 = 220 kN εP0 = 0.85 %Longitudinal modulus (standard modulus) Emin = 165’000 N/mm2
14.Oct.2019 12
System
Benefits of CFRP
Light weight Easy to install Noncorrosive Unlimited length Less labor than conventional steel solutions
Additional benefits of CarboStress
Active external post-tensioning Structure safety and serviceability problems Application under operational conditions
14.Oct.2019 13
Anchor Types
Standard anchor Type III
14.Oct.2019 14
Anchor Types
Standard anchor Type II (Through ceiling or wall)
14.Oct.2019 15
Anchor Types
Various anchorages
14.Oct.2019 16
Application (e.g. Typ III)
Define location Drilling Installation & injectionChipping
14.Oct.2019 17
Application (e.g. Typ III)
Installation of tendon Appling of adhesive(if bonded)
Protection (optional)Tensioning of tendon
14.Oct.2019 18
Protection (optional)
Protection against fire (e.g. Promat Plates)
14.Oct.2019 19
Protection (optional)
Protection of plates against mechanical impact
14.Oct.2019 20
References
14.Oct.2019 21
Strengthening of Bridges
Strengthening of bridges:
1. Shear
2. Widening of the super
structure
3. Wind / noise barrier walls
4. Longitudinal and transverse
5. Pier heads
14.Oct.2019 22
Pontcharra (FR) – Small space, precast elements
14.Oct.2019 23
Pontcharra (FR) – Small space, precast elements
Two CarboStress-Systems per beam
14.Oct.2019 24
Pontcharra (FR) – Small space, precast elements
Two CarboStress-Systems per beam
(16’’)
14.Oct.2019 25
Qatar (QA) – High reinforcement with multilayer
Bridge N29 in Qatar: Compensation of lost post-tensioning force
14.Oct.2019 26
Qatar (QA) – High reinforcement with multilayer
Bridge N29 in Qatar: Compensation of lost post-tensioning force
14.Oct.2019 27
Qatar (QA) – High reinforcement with multilayer
The solution: 16 Prestressed CFRP-Plates and Sika-Wrap on the outside
14.Oct.2019 28
Qatar (QA) – High reinforcement with multilayer
The solution: 16 Prestressed CFRP-Plates
Stacks of5 systemsStack of
6 systems
14.Oct.2019 29
Spreitenbach (CH) – Bridge strengthening
Sandacher-Bridge in Switzerland: Built in 1969/70
14.Oct.2019 30
Spreitenbach (CH) – Bridge strengthening
Cross-section
14.Oct.2019 31
Spreitenbach (CH) – Bridge strengthening
Longitudinal Section
14.Oct.2019 32
Spreitenbach (CH) – Bridge strengthening
Arrangement of 18 Prestressed CFRP-Plates (18 plates=3’960kN)
14.Oct.2019 33
Spreitenbach (CH) – Bridge strengthening
Arrangement of 18 Prestressed CFRP-Plates (18 plates=3’960kN)
14.Oct.2019 34
Strengthening of Industrial and High-rise buildings
Industrial and high-rise buildings:
1. Slab and beam strengthening
2. Earthquake strengthening
3. Strengthening due to changes
Ideal application criteria:
- High strengthening degree
- Serviceability problems
- Strengthening of prestressed
structures
- Cracked concrete
14.Oct.2019 35
Vienna (AT) – Serviceability problem
Casino – Romoval of existing pillars
14.Oct.2019 36
Lucerne (CH) – Extend span of beam
Paper plant Perlen, new columns
14.Oct.2019 37
Lucerne (CH) – Extend span of beam
New situation with displaced columnsnew columns
14.Oct.2019 38
Trainstation. New pedestrian tunnel
Bern (CH) – Structural change
New tunnel
14.Oct.2019 39
Trainstation. New pedestrian tunnel
Bern (CH) – Structural change
14.Oct.2019 40
Würenlingen (CH) – Silo strengthening
Silo strengthening
14.Oct.2019 41
Earthquake Strengthening
Strengthening of masonry walls
14.Oct.2019 42
Bern (CH) – Precast concrete elements
Fellergut – Lack of reinforcement in the joints
Source Pläne: W2H Architekten AG
14.Oct.2019 43
Windisch (CH) - Earthquake Strengthening
Object: Office building Switzerland Refurbishment: 2 Basements Ground floor 7 floors 1 additional floor
Problem: Earthquake safety Compliance factor according to SIA 2018 αeff = 0.10
14.Oct.2019 44
Windisch (CH) - Earthquake Strengthening
Dimension 14 x 34 m Height 25 resp. 30 m
Structure Skeleton structure with concrete columns and core Durisol masonry system
Problem Big eccentricity between centre of mass
and centre of rigidity West-Facade (αeff = 0.10)
ConcreteMasonry
General floor layout
Ground floor
Nord
Süd
West
Nord
Süd
West
14.Oct.2019 45
16 StressHead CarboStress Systems
14.Oct.2019 46
Muotathal (CH) – Earthquake strengthening
School building
14.Oct.2019 47
Muotathal (CH) – Earthquake strengthening
School building
14.Oct.2019 48
Muotathal (CH) – Earthquake strengthening
School building
14.Oct.2019 49
Visp (CH) - Earthquake Strengthening
Hospital Visp (Building class III)
4 concrete wallsL = 2.4 – 4.5mH = 21 – 22m
14.Oct.2019 50
Design
14.Oct.2019 51
Tests
University of Lucerne (CH) Different anchors, strengthened slab
Politecnico di Milano, Italy (I) Under fatigue (2 Mio cycles)
StressHead Ltd, Lucerne (CH) Long Term Tests since 10years with overtensioning-> To extrapolate to 50 years (Creep, relaxation, etc.)
Applied expierence on site 20 years
14.Oct.2019 52
Tests
Long Term Test at 240 kN since 2009 -> Relaxation: max. 2mm / 50 years & head
0 1 10 50 1002mm
14.Oct.2019 53
Summary StressHead-CarboStress System
Active strengthening
Restriction of deformation of the structure
High reinforcement forces / very limited space between anchors
Concentrated introduction of force
Minimum interferences into the structure
Simple and fast application
Corrosion protection
14.Oct.2019 54
Discussion!