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Title |
Nonlinear Behavior of Seismic-Strengthened Domestic School Building
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Authors |
류승현 ; 윤현도 ; 김선우 ; 이강석 ; 김용철 |
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Keywords |
철근콘크리트 학교 건물 ; 비선형 해석 ; 내진성능 ; 끼움 전단벽 ; 철골 브레이스 Reinforced concrete school building ; Nonlinear analysis ; Seismic performance ; Infill shear wall ; Steel brace |
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Abstract |
This paper describes an analytical study on seismic performance of domestic reinforced concrete (RC) school building not designed by seismic provision. The seismic index and the seismic performance of the building were evaluated through Japanese standard and Midas Gen, respectively. Seismic index (Is) of the RC school buildings in the X-direction is below 0.4. Based on the seismic index, for seismic-strengthening the building, infill shear wall or steel brace with a capacity of 1,300 kN was used. According to nonlinear static analysis results, the contribution of the seismic-strengthening to the shear resistance of the school building was measured to be greater than 30%. However, as expected, shear strength of school building strengthened with infill wall dropt rapidly after peak load and much narrower ductile behavior range was observed compared to steel brace strengthened building. Also, the building strengthened with steel brace showed 30% larger spectral displacement than that strengthened with infill shear wall. In nonlinear dynamic analysis, for the time history analysis, the maximum displacement showed tendency to decrease as amount of reinforcement increased, regardless of strengthening method. It was recommended that variable soil properties and earthquake record should be considered for improving seismic performance of buildings in seismic zone.
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