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Seismic Behavior of Concentric Steel Braced Frames In Near Fault Ground Motion

Mahdizadeh Sari, Alireza | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39028 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar
  7. Abstract:
  8. The use of braced frames has become more popular in seismic design of buildings because of the simplicity in design and construction. The first event that occurs in the earthquake for a concentrically brace frame (CBF), is the buckling of the strut. The inelastic behavior of CBF systems is dominated by brace buckling, yielding and the post buckling behavior. The Inelastic performance of the brace is nonsymmetrical, because of the difference in the tensile and compressive strength of the brace and the deterioration in the resistance after buckling. so we have too complexity in modeling the inelastic performance of brace members. Also the subject of the near fault ground motion and design of the safe structure in near-field zones is a new topic and a large number of investigations have done in this field. In this research, a practical model for seismic analysis of braced steel frames including post buckling behavior was presented. A model for analyzing an isolated brace member was developed and accuracy of the model was verified by the predicted response of previous experimental results. Also the cyclic response of a single story one bay SCBF system was compared to the response of tested frames. Also the seismic behavior of concentrically steel braced frame in near fault ground motion was investigated in this study. For this purpose, the four groups of concentrically braced frame including 3, 6, 9 and 12 stories were modeled in the OpenSees platform using the procedure stated above. Then the seismic behavior of these frames was studied under original records of near field with forward directivity effect, the pulse type and background records derived from the original record. Finally, the portion of every one in structural damage was characterized. Also the accuracy of artificial pulse in prediction of damage was investigated
  9. Keywords:
  10. Post-Buckling Behavior ; Near-Field Earthquake ; Concentric Bracing ; Strut Buckling Behavior ; Forward Directivity

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