기둥 파괴모드에 따른 학교 건물 철골 가새 보강의 효율성
The Efficiency of Steel Brace Strengthening of School Buildings according to the Failure Mode of Columns
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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.
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.
참고문헌 (13)
- Ministry of Education, "Seismic performance evaluation and rehabilitation manual for school buildings", ~ (2021)
- Ministry of Land, Infrastructure and Transport, "Korean building code-structural (KDS 41 00 00)", ~ (2019)
- Ministry of Education, "Seismic design code for school buildings", ~ (2020)
- Lee HS, "Comparison of Seismic Performance of Steel Brace Reinforcement in School Buildings according to Analysis method", MS, pp.2022
- MIDAS IT, "MIDAS GEN User's Manual, ver 890", ~ (2020)
- Computers and Structures, Inc, "Perform-3D, Ver. 6.0", ~
- Ministry of the Interior and Safety, "A white paper on Pohang earthquake" (2017)
- 김태완, "조적채움벽 및 허리벽이 학교 건물 내진 성능에 미치는 영향에 대한 해석적 연구", 한국지진공학회논문집, 17(5), pp.197~207 (2013), 한국지진공학회
- ASCE, "Seismic evaluation and retrofit of existing buildings (ASCE", SEI 41-13), 2013
- 김진영, "포항지진의 피해 결과를 반영한 기존 저층 필로티 건물의 지진취약도함수", 한국지진공학회논문집, 25(6), pp.251~259 (2021), 한국지진공학회[DOI]
- 주창혁, "KDS 41 17 00에 따라 설계된 저층 필로티 건물의 지진취약도", 한국지진공학회논문집, 26(2), pp.49~58 (2022), 한국지진공학회[DOI]
- "PEER Ground Motion Database"[URL]
- Ministry of Land, Infrastructure and Transport, "Seismic design code for buildings (KDS 41 17 00)", ~ (2019)