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Journal of the Korean Society of Hazard Mitigation 2011;11(6):39-44.
Published online December 31, 2011.
비내진 설계 내력벽방식 공동주택의 보강기법에 따른 내진성능평가
강종
Seismic Performance Evaluation According to Retrofit Techniques of Nonseismically Designed Shear Wall Type Apartment
Jong Kang
Abstract
The aim of this study was to investigate the security and reliability of structure based on performance objective on the seismic performance evaluation according to the seismic reinforcing formality of reinforced concrete wall-structural apartment building without seismic design. To evaluate the seismic performance, FEMA 356 was selected as guidelines and pushover analysis was conducted with nonlinear static analysis. The maximum story drift ratio before reinforcement of existing structures in 500 recurrence period was 0.66% which exceeded life safety level, but the performance was improved due to decrease of the safety level (0.47%) after internal and external reinforcement. Moreover, the maximum story drift ratio of existing structures in 2400 recurrence period was 1.31% which exceeded life safety level, but the performance was improved because the ratio appears to be below the safety level (0.93%) after internal and external reinforcement.
Key Words: Performance based seismic design; Pushover; Force-based design method; Displacement-based design method
요지
내진설계가 되지 아니한 철근콘크리트 내력벽식 공동주택의 내진보강 형식에 따른 내진성능 평가를 수행함으로써 성능목표를 기초로 한 구조물의 안전성과 신뢰성을 확보하고자 하였다. 내진성능을 평가하기 위해 FEMA 356을 채택하였으며, 비선형 정적해석으로 pushover 해석을 수행하였다. 해석결과, 500년 재현주기에서 기존 건축물의 보강전 최대층간 변위각 비는 0.66%로 기능수행 수준을 상회하고 있으나 내 외부 내력벽 보강을 했을 경우에는 0.47%로 성능이 보다 향상되어지는 것으로 나타났다. 그리고 2400년 재현주기에 있어서 기존 구조물의 최대 층간변위비는 1.31%로 인명안전수준을 초과하였으나 내 외부 보강 후 0.93%로 인명안전수준 이하로 나타나 성능이 향상되었음을 알 수 있었다.
핵심용어: 성능기반 내진설계; 푸쉬오버; 하중기반 설계법; 변위기반 설계법


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