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Research Paper

Seismic Fragility Evaluation of Bridges Considering Rebar Corrosion

철근 부식을 고려한 교량의 지진취약도 평가

Soobong Shin1
,
Sina Kong2
,
Jiho Moon3
,
Jong-Keol Song4*
신 수봉1
,
꽁 씨나2
,
문 지호3
,
송 종걸4*
1Professor, Department of Civil Engineering, Inha University, Inchon, 22201, Korea
2Graduate Student, Department of Civil Engineering, Kangwon National University, Chuncheon, 24375, Korea
3Assistant Professor, Department of Civil Engineering, Kangwon National University, Chuncheon, 24375, Korea
4Professor, Department of Civil Engineering, Kangwon National University, Chuncheon, 24375, Korea
1인하대학교 사회인프라공학과 교수
2강원대학교 건축·토목·환경공학부 석사과정
3강원대학교 건축·토목·환경공학부 조교수
4강원대학교 건축·토목·환경공학부 교수
*Corresponding Author
31 August 2021. pp. 231-241
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Abstract

Although the deterioration of bridges may occur due to various causes, one of the representative causes is that the chloride used for deicing in the winter penetrates bridge members and results in corrosion. This study aims to quantify the ageing degree resulting from the corrosion of a bridge, apply it to the inelastic dynamic analysis model of the bridge, perform a seismic fragility analysis, and evaluate the relationship between the ageing degree and the seismic fragility curve. It is important to appropriately define the threshold values for each damage state in seismic fragility analyses considering the ageing degree. The damage state was defined using the results of existing experimental studies on the characteristics of the deterioration in the displacement ductility capacity of the pier, according to the ageing degree. Based on the seismic fragility analyses of six types of bridges divided by three types of bearing devices and two pier heights, it was found that the seismic vulnerability tends to increase with the ageing degree. The difference in seismic vulnerability with respect to the ageing degree exhibits a tendency to increase as the damage state progresses from slight to moderate, severe, and collapse.

Keywords
seismic fragility analysis
ageing degree
damage state
corrosion

교량의 노후화는 다양한 원인에 기인하겠지만 겨울철에 제설용으로 살포하는 염화칼슘이 교량부재에 침투하여 부식을 유발하는 것이 대표적인 교량 노후화 원인중 하나라고 할 수 있다. 본 연구의 목적은 교량의 부식에 의한 노후화 정도를 정량화하고 이를 교량의 해석모델에 적용하여 노후화 정도에 따른 지진취약도 해석을 수행하고 노후화 정도와 지진취약도 곡선의 관계를 평가하는 것이다. 노후화 정도를 고려한 지진취약도 해석에 각 손상상태별로 한계값을 적절히 정의하는 것이 중요하다. 본 연구에서는 손상정도에 따른 변위 연성도 능력의 저하 특성에 관한 기존 연구결과를 활용하여 손상상태를 정의하였다. 세 가지 교량받침과 두 가지 교각 높이에 따른 예제 교량들의 지진취약도 해석으로부터 노후화 정도가 증가할수록 지진취약도가 증가하는 경향이 나타냄을 알 수 있다. 이러한 노후화 정도에 따른 지진취약도의 차이는 손상상태가 경미, 보통, 심각, 붕괴의 상태로 갈수록 증가하는 경향을 나타낸다.

키워드
지진취약도 해석
노후도
손상상태
부식
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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 : 34
  • No :4
  • Pages :231-241
  • Received Date : 2021-06-29
  • Revised Date : 2021-07-12
  • Accepted Date : 2021-07-13
  • DOI :https://doi.org/10.7734/COSEIK.2021.34.4.231
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