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Seismic Performance Evaluation of Shear Wall Buildings through Nonlinear Dynamic Analysis

Mosaferi, Mehdi | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39864 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. The primary goal of seismic design requirements of building codes is to protect life safety of occupants during severe earthquakes. Thus it is required that collapse probability of designed buildings to be acceptably low. However current design codes are strength based and intrinsically experimental. Thus collapse safety of buildings designed by these codes is not known quantitatively. The history of formation and update of seismic building codes is marked by big earthquakes; often serving as landmarks for the evolution of seismic codes and detecting its deficiencies. As time passes, the design criteria become more and more articulate and ambitious, just as the design objectives evolve from collapse prevention only to also ensuring the possibility of immediate occupancy after an earthquake. Design objectives in current design codes implicitly provide life safety and damage control in low and moderate earthquakes and also preventing structural collapse at severe earthquakes. But achieving this goal is not definitely proved and every now and then a big earthquake highlights this problem. In this study a novel framework in the emerging field of performance-based earthquake engineering (PBEE) which is recently developed by Pacific Earthquake Engineering Research Center (PEER) is utilized to evaluate seismic performance of buildings in which the main lateral load bearing system is shear walls. A central component of this framework involves assessing collapse risk of structures through dynamic analysis of nonlinear simulation models. Assessments of collapse performance provide one possible metric of life safety of building structures. By using this methodology in current study the collapse margin ratios of buildings designed according to current building codes (ACI-318 05 and ASCE/SEI 7-05) is evaluated quantitatively. Results show that these buildings show undesirable behavior and failure modes and also it proves the need to change minimum design base shear requirement in the ASCE/SEI 7-05 provisions.
  9. Keywords:
  10. Seismic Assessment ; Nonlinear Dynamic Analysis ; Shear Walls ; Incremental Dynamic Analysis ; Static Pushover Analysis

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