KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Evaluation of Inelastic Seismic Responses of Multi-Degree-of-Freedom Bridge Structures using Capacity Spectrum Method

역량스펙트럼 방법을 이용한 다자유도 교량의 비탄성 지진응답 평가

Song, Jong-Keol
송종걸

  • Published : 2004.05.31

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Abstract

To evaluate inelastic seismic responses of multi-degree-of-freedom (MDOF) bridge structures, the capacity spectrum method (CSM) incorporating the equivalent single-degree-of-freedom (ESDOF) method is presented. Application of the CSM incorporating the ESDOF method is illustrated by example analysis for symmetric and asymmetric bridge structures. To investigate an accuracy of the CSM, the maximum displacements estimated by the CSM are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the CSM provided conservative estimates of the maximum displacements for the symmetric and asymmetric bridge structures, and the trend of conservative estimates of the asymmetric bridge structures was significantly larger than that of the symmetric bridge structure.

다자유도 교량 구조물의 비탄성 지진응답을 평가하기 위하여 등가단자유도 방법을 역량스펙트럼 방법에 결합시킨 방법을 제시하였다. 등가단자유도 방법과 결합된 역량스펙트럼 방법의 비탄성 지진응답평가에 관한 적용성은 대칭 및 비대칭 교량의 예제해석을 통하여 설명하였으며, 정확성은 역량스펙트럼 방법에 의해 산정된 최대변위응답과 인공지진에 대한 비탄성 시간 이력해석으로부터 산정된 최대변위응답과의 비교를 통하여 평가하였다. 예제해석을 통하여 역량스펙트럼 방법은 대칭 및 비대칭 교량에 대하여 보수적인 평가를 함을 알 수 있으며, 비대칭 교량의 경우가 대칭교량에 비하여 보수평가의 경향이 상대적으로 큼을 알 수 있었다.

Keywords

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