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Seismic Performance Assessment of Composite Shear Wall System Using Nonlinear Analysis

Haji Agha Mohammadi, Moein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54851 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Massood
  7. Abstract:
  8. The purpose of this study is to investigate the seismic performance factors of a structure with the composite shear wall system that, if properly implemented, a nonlinear seismic design process will lead to safety against earthquake collapse. In this research, a special type of composite shear wall is investigated, which consists of a steel plate in the middle of the reinforced concrete shear wall. The purpose of this combination is to improve the performance of the wall because steel plates can effectively improve the seismic behavior of the structure, and concrete can protect the steel plate from buckling and corrosion. In this study, numerical models are validated according to previous experimental data and then, by performing parametric studies, new walls are examined. The results of numerical modeling showed that according to the multiple experimental results, various factors such as aspect ratio, wall and steel panel thickness, and boundary element details affect the seismic behavior of the composite shear wall. To evaluate the seismic performance of the composite shear wall system according to the method mentioned by FEMA-P695, archetypes in 8 performance groups were studied. 3, 5, 7, and 9-story buildings were subjected to incremental nonlinear static and dynamic analysis. Then, by considering the uncertainty in ground motion records, design requirements, experimental data, and nonlinear modeling, a logical basis for creating seismic performance factors including response modification factor, over-strength factor, and displacement amplification factor of the structure are provided. The results of the dynamic analysis indicate the improvement of seismic performance and fragility curves indicating the appropriate safe margin of the composite shear wall seismic system compared to the concrete shear wall against collapse. The composite shear wall system meets the seismic response modification factor R equal to 7 acceptance criteria of FEMA-P695.
  9. Keywords:
  10. Nonlinear Analysis ; Seismic Performance ; Composite Shear Wall ; Model Calibration ; Federal Emergency Management Agency (FEMA)P695 Code

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