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Title |
A Study on Brace-height Ratio for Seismic Retrofit of School Building
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Authors |
이화정(Hwa-Jung Lee) ; 변대근(Dae-Kun Byon) ; 윤성기(Sung-Kee Yoon) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.4.10 |
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Keywords |
학교건축물; 내진성능; 철골가새골조; 가새-높이비; 비선형정적해석; 내진보강 school building; seismic performance; steel brace frame; brace-height ratio; nonlinear static analysis; seismic retrofit |
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Abstract |
The recent earthquake in Korea caused large and small damages to many school building. School building is an important building thatis used as a shelter in the event of disaster. Among the seismic retrofit methods, the internal steel braced frame type method is used for its relativelyeasy construction and excellent performance. In this study, the maximum shear force and displacement were compared and examined by applyingthe brace frame to existing concrete school buildings. As a result, we verified the adequacy of the analytical model and compared and examined theeffect of brace-height ratio on the span of the existing school buildings. The adequacy of the maximum shear force and displacement relationship canbe confirmed in the model with a length of 0.3. In addition, seismic frame was applied to the actual non-seismic reinforced concrete school building,and the seismic performance was evaluated by nonlinear static analysis(Push-over analysis) according to the ratio of brace-height. As a result, the increaseof the brace-height according to the brace-height ratio has the effect of increasing the maximum shear force and maximum load at the performancepoint. But the collapse of the braced frame due to the increase in the lateral stiffness occurred, indicating that seismic retrofit according to the properbrace-height is necessary. Therefore, in the seismic retrofit design of brace frame of existing school building, it is necessary to select the properbrace-height after retrofit analysis according to the brace-height ratio.
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