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Studying the Behaviour of Split-Level Structures with Semi-Rigid Connections

Khodayari, Abbas | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47074 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khonsari, Vahid
  7. Abstract:
  8. Past earthquakes show that irregular structures have been more vulnerable than their regular counterparts. One of the common types of irregular buildings in urban areas is split-level ones. On the other hand, beam-to-column connections in steel structures are mostly of "semi-rigid" type. In this work, effects of different levels of rigidity of connections, 100%, 75%, 50% and 25%, on the behavior of a number of two-dimensional split-level steel structures, with 1.5 m difference in levels of floors, 2, 3, 5 and 6 bays, and 5, 10 and 15 stories, were studied. All frames were analyzed “with” and “without” considering the P-∆ phenomenon, with two methods, ‘equivalent static load,’ and ‘modal response spectrum analysis,’ based on ASCE/SEI 7-10 and UBC 97. These studies revealed that decreasing the rigidity of connections, substantially increases the period of the first mode, whereas its effect on higher modes is marginal. Comparing the lateral loads obtained from the two methods showed that for frames with fully-rigid connections there were great differences between them whereas for those with semi-rigid connections such differences were more pronounced. A similar comparison made between the loads obtained from ‘nonlinear time-history analysis’ and ‘equivalent static load method’ showed that loads predicted by the UBC 97 are more in line with their time-history counterparts
  9. Keywords:
  10. Spectral Analysis ; Semirigid Connection ; Nonlinear Time History Analysis ; Irregular Structures ; Split Level Buildings ; Equivalent static Analysis

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