Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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The Efficiency of Steel Brace Strengthening of School Buildings according to the Failure Mode of Columns

기둥 파괴모드에 따른 학교 건물 철골 가새 보강의 효율성

  • Lee, Hee Seop (Hanwool Structural Safety Technology) ;
  • Kim, Taewan (Department of Architectural, Civil, and Environmental Engineering, Kangwon National University)
  • 이희섭 (한울구조안전기술) ;
  • 김태완 (강원대학교 건축토목환경공학부)
  • Received : 2022.10.06
  • Accepted : 2023.01.19
  • Published : 2023.03.01
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Abstract

Steel brace strengthening is the most popular seismic rehabilitation method for school buildings. This is because the design can be conducted by using relatively easy nonlinear pushover analysis and standard modeling in codes. An issue with steel brace strengthening is that the reinforced building should behave elastically to satisfy performance objectives. For this, the size of steel braces should be highly increased, which results in excessive strengthening cost by force concentration on existing members and foundations due to the considerable stiffness and strength of the steel braces. The main reason may be the brittle failure mode of columns, so this study investigated the relationship between the efficiency of steel brace strengthening and column failure modes. The result showed that the efficiency is highly dependent on the shear capacity ratio of columns and structural analysis methods. School buildings reinforced by steel braces do not need to behave elastically when the shear capacity ratio is low, and pushover analysis is used, which means reducing steel material is possible.

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Acknowledgement

이 논문은 2022년도 강원대학교 대학회계의 지원을 받아 수행한 연구임.

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