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Investigating the Response Reduction Factor of Steel 3-D Braced Frames with Eccentricity

Afshari, Behrouz | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52092 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khonsari, Vahid
  7. Abstract:
  8. Studying the performance of irregular structures in past earthquakes reveals that due to their severe vulnerability, we need to accurately assess the behavioral characteristics of such structures. On the other hand, all existing seismic codes recommend the use of response modification factor to determine the base shear, design forces of the members, and the design drift ratios, which seem to have limited comprehensiveness. Moreover, the response modification factor for a structural system is discussed in a general manner and the effect of factors such as number of bays, number of stories, span length, story height and irregularities are not considered. In this research, the effects of "irregularity in the plan," presented by an eccentricity, which is the distance between the centers of mass and stiffness, has been studied for structures comprising braced frames in both directions (in plan). The structures were loaded using the provisions of the ASCE/SEI 7-16 and designed in accordance with ANSI/AISC 360-16. Potential plastic hinges were defined in designed structures in accordance with the ASCE/SEI 41-17 Regulations to take plasticity into account. Then structures were subjected to static nonlinear analysis and seismic parameters were extracted using the Uang method. Finally, by performing linear regression, the dependence of the response modification factor on each of the structural characteristics was examined and the relationship to predict the response modification factor based on the number of bays in both directions, the number of stories, span length, eccentricity and the design ratio was provided
  9. Keywords:
  10. Response Modification Factor (R) ; Steel Braced Frames ; Three Dimentional Frames ; Torsional Eccentricity ; Plan Irregularity ; Linear Regression ; Eccentric Brace

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