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2023 Vol.36, Issue 3 Preview Page

Research Paper

Development of System-level Seismic Fragility Methodology for Probabilistic Seismic Performance Evaluation of Steel Composite Box Girder Bridges

강상자형 합성거더교의 확률론적 내진성능 평가를 위한 시스템-수준 지진취약도 방법의 개발

Sina Kong1
,
Yeeun Kim2
,
Jiho Moon3
,
Jong-Keol Song4*
꽁 씨나1
,
김 예은2
,
문 지호3
,
송 종걸4*
1Graduate Student, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
2Graduate Student, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
3Assistant Professor, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
4Professor, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
1강원대학교 건축･토목･환경공학부 박사과정
2강원대학교 건축･토목･환경공학부 석사과정
3강원대학교 건축･토목･환경공학부 부교수
4강원대학교 건축･토목･환경공학부 교수
*Corresponding Author
30 June 2023. pp. 173-184
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Abstract

Presently, the general seismic fragility evaluation method for a bridge system composed of member elements with different nonlinear behaviors against strong earthquakes has been to evaluate at the element-level. This study aims to develop a system-level seismic fragility evaluation method that represents a structural system. Because the seismic behavior of bridges is generally divided into transverse and longitudinal directions, this study evaluated the system-level seismic fragility in both directions separately. The element-level seismic fragility evaluation in the longitudinal direction was performed for piers, bridge bearings, pounding, abutments, and unseating. Because pounding, abutment, and unseating do not affect the transverse directional damages, the element-level seismic fragility evaluation was limited to piers and bridge bearings. Seismic analysis using nonlinear models of various structural members was performed using the OpenSEES program. System-level seismic fragility was evaluated assuming that damage between element-levels was serially connected. Pier damage was identified to have a dominant effect on system-level seismic fragility than other element-level damages. In other words, the most vulnerable element-level seismic fragility has the most dominant effect on the system-level seismic fragility.

Keywords
pounding
unseating
element-level
system-level
bridge system
seismic fragility

강진에 대한 다양한 비선형 거동을 하는 부재요소들로 이루어진 교량시스템의 현재까지의 일반적인 지진취약도 평가방법은 부재-수준에서 평가하는 것이다. 본 연구의 목적 부재-수준의 지진취약도 평가결과로부터 구조시스템을 대표하는 시스템-수준의 지진취약도 평가방법을 개발하는 것이다. 교량의 지진 거동을 일반적으로 교축방향과 교축직각방향으로 구분하기 때문에 본 연구에서도 시스템-수준 지진취약도를 두 방향에 대하여 구분해 평가하였다. 길이 방향에 대한 부재-수준의 지진취약도평가는 교각, 교량받침, 충돌, 교대, 낙교에 대하여 수행하였다. 교축직각 방향에 대해서는 충돌, 교대, 낙교의 손상이 영향을 주지 않으므로 부재-수준의 지진취약도평가는 교각과 교량받침에 대하여만 수행하였다. 다양한 구조부재의 비선형모델을 이용한 지진해석은 OpenSEES 프로그램을 사용하여 수행하였다. 시스템-수준의 지진취약도는 부재-수준 사이의 손상이 직렬연결이라고 가정하고 평가하였다. 교각의 손상이 다른 부재-수준의 손상보다 시스템-수준의 지진취약도에 지배적인 영향을 주는 것을 알 수 있었다. 다시 말하면 가장 취약한 부재-수준의 지진취약도가 시스템-수준의 지진취약도에 가장 지배적인 영향을 주는 것을 의미한다.

키워드
충돌
낙교
부재-수준
시스템-수준
교량시스템
지진취약도
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 36
  • No :3
  • Pages :173-184
  • Received Date : 2023-03-27
  • Revised Date : 2023-05-02
  • Accepted Date : 2023-05-02
  • DOI :https://doi.org/10.7734/COSEIK.2023.36.3.173
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