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2022 Vol.35, Issue 3 Preview Page

Research Paper

System-Level Seismic Fragility Evaluation of Bridge Considering Aging Effects

노후도를 고려한 교량의 시스템-수준 지진취약도 평가

Sina Kong1
,
Jiho Moon2
,
Jong-Keol Song3*
꽁 씨나1
,
문 지호2
,
송 종걸3*
1Graduate Student, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
2Assistant Professor, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
3Professor, Department of Civil Engineering, Kangwon National University, Chuncheon, 24341, Korea
1강원대학교 건축･토목･환경공학부 석사과정
2강원대학교 건축･토목･환경공학부 조교수
3강원대학교 건축･토목･환경공학부 교수
*Corresponding Author
30 June 2022. pp. 149-158
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Abstract

As a bridge ages, its mechanical properties and structural performance deteriorate, degrading its seismic performance during a strong earthquake. In this study, the aging of piers and bridge bearings was quantified in several stages and reflected in the analysis model, enabling the evaluation of the member-level seismic fragility of these bearings. Moreover, by assuming that the failure mechanism of a bridge system is a series system, a method for evaluating the system-level seismic fragility based on the member-level seismic fragility analysis result is formulated and proposed. For piers with rubber and lead–rubber bearings (members vulnerable to aging effects), five quantitative degrees of aging (0, 5, 10, 25, and 40%) are assumed to evaluate the member-level seismic fragility. Then, based on the result, the system-level seismic fragility evaluation was implemented. The pier rather than the bridge bearing is observed to have a dominant effect on the system-level seismic fragility. This means that the seismic fragility of more vulnerable structural members has a dominant influence on the seismic fragility of the entire bridge system.

Keywords
system-level seismic fragility analysis
aging degree
damage state
bridge system

교량은 사용년한이 증가함에 따라 노후화로 인해 역학적인 성질과 구조적인 성능이 저하되고, 이로 인해서 강진 시에 내진성능이 저하된다. 교각과 교량받침에 대한 노후화를 몇 가지 단계로 정량화하여 해석모델에 반영하였고, 노후화된 교각과 교량받침에 대하여 부재-수준의 지진취약도를 평가하였다. 교량 시스템의 파괴 메카니즘을 직렬시스템으로 가정하여, 부재-수준의 지진취약도 해석 결과로부터 시스템-수준의 지진취약도를 평가하는 방법을 제안하였다. 노후도에 취약한 부재인 교각과 교량받침에 대하여 5가지 정량적인 노후도(0, 5, 10, 25, 40%)를 가정하여 부재-수준의 지진취약도를 평가하였고, 이 결과로부터 시스템-수준의 지진취약도 평가를 수행하였다. 시스템-수준의 지진취약도는 교량받침 보다는 교각이 지배적인 영향을 줌을 알 수 있었다. 이는 보다 취약한 구조부재의 지진취약도가 전체 교량시스템의 지진취약도에 지배적인 영향을 주는 것을 의미한다.

키워드
시스템-수준 지진취약도 해석
노후도
손상상태
교량시스템
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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 : 35
  • No :3
  • Pages :149-158
  • Received Date : 2022-02-09
  • Revised Date : 2022-04-05
  • Accepted Date : 2022-04-07
  • DOI :https://doi.org/10.7734/COSEIK.2022.35.3.149
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