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Assessment of Performance Based Behavior of Steel Moment Resisting Frames

Vahedian, Vahid | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40499 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moghaddam, Hassan
  7. Abstract:
  8. In order to reduce structural and nonstructural damages and associated financial losses during intense seismic events such as Bam earthquake, seismic retrofitting of existing structures should be considered as a special issue. In this regard, for quantifying the seismic performance of structures a guideline termed “instruction for seismic rehabilitation of existing building No.360” is issued which is mainly borrowed from performance-based assessment procedures FEMA 356. In contrast to conventional seismic design methods which are based on controlling stress ratio for different load combinations, in performance-based earthquake engineering methodology, the displacement control of structural components is the main criteria. Generally speaking, in guideline No. 360, there are four proposals for defining limit states. Among different approaches, the nonlinear static analysis (pushover analysis) is more prevalent in as much as its computational effort is reasonable in relation to the others and also its accuracy is comparable to the time consuming nonlinear dynamic analysis. Since this scheme is based on simplified assumptions, there are questions about accuracy of this method in predicting the expected structural demand. On the other hand, there are some concerns about finding a benchmark for measuring the consistency of analytical model of nonlinear structural component or even the reliability of recommendations in guideline No. 360. In this regard, the results of experimental tests are referred to a benchmark for controlling the accuracy of analytic models. In the following, seven building was designed with a ductile steel special moment-resisting frame as its seismic lateral system that was designed according to modern building codes and standards (i.e., AISC and ASCE) to compare the result of pushover analysis with those of nonlinear dynamic analysis. The extra issue that was investigated here was assessing the impact of local buckling in seismic performance of steel frames
  9. Keywords:
  10. Steel Moment Resistant Frame ; Seismic Rehabilitation ; Nonlinear Static Analysis ; Performance Based Design ; Local Buckling

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