Seismic Performance Assessment of Flat Plate Floor Systems John W. Wallace, Ph.D., P.E. Thomas...
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Seismic Performance Seismic Performance Assessment of Flat Assessment of Flat Plate Floor Systems Plate Floor Systems John W. Wallace, Ph.D., P.E. Thomas Hyun-Koo Kang, Ph.D. Student Department of Civil and Environmental Engineering University of California, Los Angeles CUREe-Kajima Joint Research Program: Phase IV
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Transcript of Seismic Performance Assessment of Flat Plate Floor Systems John W. Wallace, Ph.D., P.E. Thomas...
Seismic Performance Assessment Seismic Performance Assessment of Flat Plate Floor Systemsof Flat Plate Floor Systems
John W. Wallace, Ph.D., P.E.Thomas Hyun-Koo Kang, Ph.D. Student
Department of Civil and Environmental EngineeringUniversity of California, Los Angeles
CUREe-Kajima Joint Research Program: Phase IV
Modeling and Performance IssuesModeling and Performance Issues
• Lateral stiffness and ductility of the column-slab system
• Shear Reinforcement– Conventional Shear Stirrups– Shear Studs
• Punching Failures – Strength and deformation capacity– Stiffness degradation in the connection
region – progessive collapse prevention
Modeling ApproachesModeling Approaches
Effective Beam Width
Column
Slab
- Account for the influence of the concrete cracking (EIeffective)
Modeling ApproachesModeling Approaches
Equivalent Frame Model
Column
Slab
Connection
Performance Issues - PunchingPerformance Issues - Punching
(Hwang)
Performance Issues - PunchingPerformance Issues - Punching
(Hwang)
Performance Issues - PunchingPerformance Issues - Punching
Continuous bottom reinforcement to prevent collapse
(Hwang)
Performance Issues - Gravity StressPerformance Issues - Gravity StressL
ater
al L
oad
Drift
1% 2% 4%
Low Vg/Vo
High Vg/Vo
Connection ModelingConnection Modeling
Effective Beam Width with Rotational Spring
Column
Slab
Connection
1.0
0.04
0.0
Modeling ApproachesModeling Approaches
Displacement-Based Model with Shear strength degradation
Drift derived from Elastic and Inelastic curvature
Vn
d
y
u
Performance Issues - Gravity StressPerformance Issues - Gravity StressDisplacement-Based Model (Moehle)Displacement-Based Model (Moehle)
0.0 0.2 0.4 0.6 0.8 1.0Gravity Shear Ratio
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
Dri
ft R
atio
Conventional
Post-Tensioned
Best Fit (Model)
Best Fit (Exp)
Prototype & Test StructurePrototype & Test Structure
Section A-A• Prototype
- Test Structure : 2 Stories, 2 × 2 bays
Earthquake Simulator - Shake TableEarthquake Simulator - Shake Table
• Shake Table Test
(Shahrooz)
• Scale , Span-Depth Ratio- R.C. Flat Plate : 9/20 , 1/30 - Post-Tensioned Flat Plate : 1/3 , 1/33
Shear Reinforcement Shear Reinforcement
• Shear Studs
(Ghali)
R.C. Flat Plate -R.C. Flat Plate - Flexural Reinforcement Flexural Reinforcement (Test Specimen)(Test Specimen)
• Top Reinforcement • Bottom Reinforcement
P.T. flat Plate -P.T. flat Plate - Flexural ReinforcementFlexural Reinforcement(Test Specimen)(Test Specimen)
• Tendon Arrangement
- Scale : 1/3- Span-depth ratio : 1/33- Tendon : 3/8 in diameter seven-wire strands (Grade 270)- Bonded Reinforcement : 3 # 3 in each direction
9/16in
15/16in a1
