배율조정 및 스펙트럼 맞춤 입력지반운동 모델에 대한 비선형 단자유도 시스템의 파손확률
Failure Probability of Nonlinear SDOF System Subject to Scaled and Spectrum Matched Input Ground Motion Models
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초록
비선형 구조계의 확률론적 지진해석 방법 중 대표적인 것은 지진 재해도 수준에 해당하는 입력지반운동 모델을 사용한시간이력을 수행하여 그 응답의 확률분포를 예측하는 것이다 이 연구에서는 널리 사용되고 있는 두 가지 입력지반운동 모델에 따른 구조..정 입력지반운동과 설계 응답스펙트럼에 상응하는 인공 지진기록을 사용하는 스펙트럼 맞춤 입력지반운동 두 가지를 고려한다 동일한.지진재해도 수준을 고려한 해석결과 설계 응답스펙트럼에 상응하는 인공 지진기록을 사용한 입력지반운동 모델은 실제 지진기록을 배율조정한 입력지반운동 모델보다 평균적으로 응답을 크게 평가하였고 이로 인해 파손확률 또한 더 큰 것으로 나타났다 이러한 경향은 연약.한 지반에서 더욱 현저한 것으로 나타났다 이러한 입력지반운동 모델에 따른 파손확률의 차이는 스펙트럼 맞춤 입력지반운동의 목표로.만들어졌기 때문인 것으로 나타났다.
Abstract
In probabilistic seismic analysis of nonlinear structural system, dynamic analysis is performed to obtain thedistribution of the response estimate using input ground motion time histories which correspond to a given seismic hazard level.This study investigates the differences in the distribution of tmotion models. Two types of input ground motion models are considered: real earthquake records scaled to specified intensity leveland artificial input ground motion fitted to design response spectrum. Simulation results for a nonlinear SDOF system demonstratethat the spectrum matched input ground motion produces largerfailure probability than those of scaled input ground motion dueto biased responses. Such tendency is more remarkable in the site of soft soil conditions. Analysis results how that such differenceof failure probability is due to the conservamotion.
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