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Architectural Institute of Korea (대한건축학회)
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Seismic Retrofit Assessment of Different Bracing Systems

  • Sudipta Chakraborty (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University) ;
  • Md. Rajibul Islam (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University) ;
  • Dookie Kim (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University) ;
  • Jeong Young Lee (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University)
  • Received : 2022.11.03
  • Accepted : 2023.03.28
  • Published : 2023.03.30
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Abstract

Structural ageing influences the structural performance in a negative way by reducing the seismic resilience of the structure which makes it a major concern around the world. Retrofitting is considered to be a pragmatic and feasible solution to address this issue. Numerous retrofitting techniques are devised by researchers over the years. The viability of using steel bracings as retrofitting component is evaluated on a G+30 storied building model designed according to ACI318-14 and ASCE 7-16. Four different types of steel bracing arrangements (V, Inverted V/ Chevron, Cross/ X, Diagonal) are assessed in the model developed in commercial nu-merical analysis software while considering both material and geometric nonlinearities. Reducing displacement and cost in the structures indicates that the design is safe and economical. Therefore, the purpose of this article is to find the best bracing system that causes minimum displacement, which indicates maximum lateral stiffness. To evaluate the seismic vulnerability of each system, incremental dynamic analysis was conducted to develop fragility curves, followed by the formation of collapse margin ratio (CMR) as stipulated in FEMA P695 and finally, a cost estimation was made for each system. The outcomes revealed that the effects of ge-ometric nonlinearity tend to evoke hazardous consequences if not considered in the structural design. Probabilistic seismic and economic probes indicated the superior performance of V braced frame system and its competency to be a germane technique for retrofitting.

Keywords

Acknowledgement

This research was supported by UNDERGROUND CITY OF THE FUTURE program funded by the Ministry of Science and ICT.

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