As the structural damage caused by earthquakes has been gradually increasing, estimating the seismic fragility of structures has become essential for earthquake preparation. Seismic fragility curves are widely used as a probabilistic indicator of structural safety against earthquakes, and many researchers have made efforts to develop them in a more accurate and effective manner. However, most of the previous research studies used simplified 2D analytical models when deriving fragility curves,

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... inly to reduce the numerical simulation time; however, in many cases 2D models are inadequate to accurately evaluate the seismic behavior of a structure and its seismic vulnerability. Thus, this study provides a way to derive more accurate, but still effective, seismic fragility curves by using 3D analytical models. In this method, the reliability analysis software, FERUM, is integrated with the structural analysis software, ZEUS-NL, enabling the automatic exchange of data between these two software packages, and the first order reliability method (FORM), which is not a sampling-based method, is utilized to calculate the structural failure probabilities. These tools make it possible to conduct structural reliability analyses effectively even with 3D models. By using the proposed method, this study conducted a seismic vulnerability assessment of RC frame structures with their 3D analytical models. Matlab)[5]과 비선형 동적해석에 특화된 구조해석 소프 트웨어인 ZEUS-NL[6]이 사용되었다. 그리고 이들 소프 트웨어들을 연동시켜 줄 수 있는 인터페이스인 FERUM-ZEUS이 개발되었다. 이들을 이용한 구조신뢰 성 해석 플랫폼의 개요는 Fig. 1과 같다. FERUM-ZEUS 를 통한 두 소프트웨어 사이의 자동적인 데이터 교환은 지진 취약도 곡선을 더욱 효율적으로 구할 수 있게 해준 다[3]. 이를 이용해 본 연구에서는 RC 프레임 구조물의 지진 취약도 곡선을 3차원 해석 모델을 이용하여 도출하 였다.