Performance comparison of brbfs designed using different response modification factors

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2020-9

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Güner, Tuğberk

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In this study, buckling restrained braced frames (BRBFs) designed with various response modification factors were examined by numerical analysis and their performances were compared using the next-generation performance assessment approach. Three, six, and nine-story archetypes (low to medium-rise) with response modification factors in the range of 1 to 8 were designed using ASCE7-16, AISC 341-16, and AISC 360-16 specifications. A total of 24 archetypes were analyzed using nonlinear dynamic analysis procedures by subjecting them to both MCE and DBE level ground motions. The ground motion histories were acquired from the FEMA P-695 Far-Field record-set and scaled according to the requirements of the FEMA P-695 methodology. FEMA P-58 methodology was utilized to assess performance. For performance evaluation; peak and residual interstory drift ratios and peak story accelerations were determined and converted to performance quantification values by using the Performance Assessment Calculation Tool (PACT), which is supplied as a part of FEMA P-58 methodology. The probabilistic distributions of repair cost and repair time, unsafe placard probability, and irreparable residual drift probability were obtained, and a comparative study of response modification factors in terms of these results was conducted. The results showed that designing BRBFs using lower response factors increases post-earthquake performance until the point where acceleration governed nonstructural damages surpass the structural damages. An ideal response factor is proposed herein based on the consequence measures. The study was complemented by investigating the behavior of self-centering BRBFs and comparing their performance with those of conventional BRBFs.

Subject Keywords

Buckling Restrained Braced Frames, Response Modification Factor, Next-Generation Performance Assessment, Fema P-58, Self-Centering

URI

https://hdl.handle.net/11511/68990

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

T. Güner, “Performance comparison of brbfs designed using different response modification factors,” M.S. - Master of Science, Middle East Technical University, 2020.