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Projects : CUREE-Kajima Joint Research Program
PHASE V RESEARCH REPORT

CKIV-02: Seismic Performance Assessment of Flat Plate Floor Systems

Thomas H.-K. Kang, Changsoon Rha, and John W. Wallace (University of California, Los Angeles)

Katsuya Igarashi and Norio Suzuki (Kajima Corporation)

An investigation into the lateral load response of reinforced concrete flat plate frames utilizing stud rails for shear reinforcement at the slab - column connections was carried out. The two by two bay, two story specimens were approximately one-third scale representations of typical slab - column frames constructed in moderate-to-high seismic zones in the United States. One of the specimens consisted of a conventional reinforced concrete flat plate (RC specimen), whereas the other specimen consisted of nominally reinforced flat plate with post-tensioning reinforcement (PT specimen). The specimens were subjected to gravity loads and increasing intensity of uniaxial base acceleration histories on the shake table at the Earthquake Engineering Research Center at UC Berkeley's Richmond Field Station. During testing, data were collected from 193 channels and five or six video cameras to assist in assessing the behavior of the specimens.

Although slab-column punching failures occurred during the tests, lateral drift ratios of 3% and 4% were achieved for the RC and PT frames, respectively, with relatively little loss of lateral load capacity. Analytical models including column cracking, and based on using an effective slab width model with an effective width factor a of 0.8 and 0.65 and a cracking factor fl of 1/3 and 1/2 for the RC and PT specimens, respectively, resulted in good correspondence between experimental and experimental responses for low-to-moderate levels of shaking. Base shear versus top level displacement relations for the analytical models also captured the nonlinear envelop responses for the more intense shaking levels reasonably well.

Overall, the results indicate that the slab - column frames can be designed to have sufficient drift capacity to be used as a non-participating frame, or as a primary lateral force resisting system in low-to-moderate seismic regions.

TABLE OF CONTENTS

Chapter 1 – INTRODUCTION
- Introduction
- Summary
- Report Organization

Chapter 2 – LITERATURE REVIEW
- Lateral-load Stiffness
- Lateral-load Strength
- Lateral-load Ductility
- Post-punching Behavior
- Post-tensioned Flat Plate
- Shake Table Tests of Flat Plate Systems
- Summary

Chapter 3 – SPECIMEN DESIGN AND CONSTRUCTION
- RC Specimen
- PT Specimen

Chapter 4 – INSTRUMENTATION AND EXPERIMENTATION
- Test Setup
- Instrumentation
- Testing

Chapter 5 – EXPERIMENTAL RESULTS
- Base Shear versus Top Relative Displacement
- Column Moment Evaluation
- Slab Moment Evaluation
- Observed Damage
- Punching Failure
- Drift Capacity of Slab-column Connections at Punching
- Monitoring and Variation of Post-tensioning Forces

Chapter 6 – ANALYTICAL STUDIES
- Introduction
- Description of Analytical Models
- Analytical Models: Low-to-moderate Level Responses
- Analytical Models: Nonlinear (Yielding) Responses

Chapter 7 – SUMMARY AND CONCLUSIONS
- Summary
- Conclusions

References
Tables
Figures
Appendix A

File Download Type Size
CKIV-02 PDF 14.4 MB


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Consortium of Universities for Research in Earthquake Engineering
last updated 02.20.15