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Evaluate and Compare the Performance of Steel Zipper Frames under Far and near Faults Earthquake

Torkamaneh Parneshani, Ehsan | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49846 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masoud
  7. Abstract:
  8. Zipper frames were proposed to provide a solution of prevention of forming soft Story due to the existence of unbalanced vertical load in Chevron frames. In this study, at first, by performing a nonlinear pushover analysis on the 2D zipper frames with 3, 7 and 12 story and 3 span that the middle one are braced, a Response modification factor for zipper frames is proposed. Then, The seismic behavior of zipper frames is evaluated under far and near-fault earthquakes by nonlinear time history analysis and at the end of the research, the cyclic behavior and energy absorption capacity of these frames are compared with the 2-story-X chevron frames with 3 and 7 story. It is concluded that the 2-story-X chevron frames under a near-fault earthquake exhibits a better seismic behavior. It is also proved that the insertion of zipper elements in zipper frames cannot guarantee an unbalanced vertical load transfer through these elements and 3 transfer paths of unbalanced vertical load is proposed. The response modification factor of 6 for the zipper frames is suggested. Results show that the energy absorption function of zipper frames in low height structures is better than the 2-story-X chevron frames. While in moderate heights this is quite the opposite, and the energy absorption of the 2-story-X chevron frames is much better than the suspended zipper frame. All nonlinear analysis is done by using OpenSees
  9. Keywords:
  10. Response Factors ; Energy Absorption ; Ductility ; Seismic Behavior ; Cyclic Analysis ; Cyclic Behaviour ; Unbalance Loads ; Zipper Frame

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