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Analytical and Experimental Evaluation on Seismic Performance of Ribbed Bracing System (RBS)

Arzeytoon, Ali | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53459 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Toufigh, Vahab; Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Ribbed Bracing System (RBS) is an innovative structural system designed to eliminate the buckling of braces and enhance the behavior of structures under seismic loads. In this study, a collaborative performance of two RBS devices bracing a frame was assessed numerically and experimentally. In the numerical phase, the collaboration of ribbed braces at various stages of reversal loading was elaborated mathematically and was used for representing the system using finite element modeling. In the next phase, the numerically observed behavior was validated experimentally by conducting cyclic quasi-static tests of the proposed configurations. Two alternative RBS configurations—called Completely Closed (CC) and Improved Centering (IC) —were considered in this regard. Various characteristics of CC- and IC-RBS configurations were evaluated using validated methods, after which they were compared against configurations of concentrically braced frames and buckling-restrained braces. The models were then subjected to incremental dynamic analysis (IDA), and their seismic performance was probabilistically evaluated at different levels of intensity. Based on the results, in the low to moderate lateral deformations, structural performance benefitted more from the energy dissipation capacity provided by CC-RBS. Nevertheless, CC-RBS demands were increased due to the accumulation of plastic deformations by surpassing height-dependent deformation thresholds. After successful experimental validation and numerical evaluation of RBS specimens in previous sections, FEMA P695 methodology is adopted in this study to subject 48 archetype structures to incremental dynamic analysis (IDA) procedure. Comparison of the provided adjusted collapse margin ratios (ACMRs) versus the allowable value given by FEMA P695 led to a decision that the initial design of archetypes assuming a R=3.25 could be economically upgraded using a R=5 value
  9. Keywords:
  10. Ribbed Bracing System (RBS) ; Energy Absorption ; Seismic Performance ; Structural Control ; Buckling ; Experimental Evaluation ; Incremental Dynamic Analysis ; Energy Dissipation ; Performance Evaluation

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