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2025 Vol.38, Issue 5 Preview Page

Research Paper

Seismic Fragility Assessment of Steel Composite Box Girder Bridges Employing Incremental Dynamic Analysis and Probabilistic Seismic Demand Model

강합성 상자형 거더교에 대한 증분동적해석과 확률론적 지진요구도 모델을 이용한 지진취약도 평가

Sinith Kung1
,
Sina Kong2
,
Souear Leng1
,
Jiho Moon3
,
Jong-Keol Song4*
꽁 씨닛1
,
꽁 씨나2
,
렝 수이어1
,
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 석사과정
2강원대학교 건축･토목･환경공학부 박사과정
3강원대학교 건축･토목･환경공학부 부교수
4강원대학교 건축･토목･환경공학부 교수
*Corresponding Author
31 October 2025. pp. 297-308
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Abstract

Bridge structures exhibit complex nonlinear behaviors among their components during strong seismic events. The incremental dynamic analysis (IDA) method, which can effectively capture dynamic nonlinear behavior, is advantageous for evaluating seismic performance. Seismic response for two example bridges equipped with lead-rubber and elastomeric bearings was evaluated employing IDA for 40 near-field and 40 far-field earthquakes, respectively. The relationship between the seismic intensities and drift ratio of the bridge piers was derived from the IDA results. The relationship curve was utilized to generate a histogram of seismic responses corresponding to the intersection points of 42 seismic intensities. The seismic fragility was evaluated by calculating the exceedance probability of each damage state threshold. The final seismic fragility function was evaluated by introducing a method to evaluate the seismic fragility of 42 points with a single median and logarithmic standard deviation function. The seismic fragility was evaluated under the same analysis conditions employing the probabilistic seismic demand model (PSDM), which is the most representative and widely used seismic fragility analysis method. The fragility function derived from the PSDM was compared with that obtained from the IDA method. The trend of the seismic fragility function obtained from the IDA exhibits a generally similar trend to that derived from the PSDM.

Keywords
incremental dynamic analysis
probabilistic seismic demand model
near fault earthquake
far-filed earthquake
seismic fragility

교량 구조물은 강진 발생 시에 구성요소들간에 복잡한 비선형 거동을 보이기 때문에 내진성능평가를 위해서는 동적 비선형 거동을 효과적으로 반영할 수 있는 증분동적해석(IDA)방법이 유리하다. 납-고무받침(LRB)과 탄성받침(RB)을 가진 두 가지 예제교량에 대하여 근거리 및 원거리 지진 각각 40개씩을 사용하여 0.01g~5.0g 범위에 지진세기에 대하여 증분동적해석을 수행하여 지진응답을 평가하였다. IDA 방법에 의해 40개의 지진세기와 교각의 변위비 사이의 관계곡선을 구하였다. 이 관계곡선에서 총 40개 지진세기의 교차점에 해당하는 지진응답들의 분포를 히스토그램으로 전환하여 손상상태 한계값의 초과확률을 구하여 지진취약도 평가하였다. 40개 점들의 지진취약도로부터 하나의 중앙값과 대수표준편차 함수로 평가하는 방법을 제시하여 최종적인 지진취약도 함수를 평가하였다. 지진취약도 해석방법 중에서 가장 대표적으로 많이 사용되는 확률론적 지진요구도 모델(PSDM)을 이용하여 동일한 해석조건에 대하여 지진취약도를 평가하였고, 이를 IDA방법에 의한 지진취약도 함수와 비교한 결과 유사한 경향을 나타냄을 알 수 있었다.

키워드
증분동적해석
확률론적 지진요구도모델
근거리 지진
원거리 지진
지진취약도
References
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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 : 38
  • No :5
  • Pages :297-308
  • Received Date : 2025-06-09
  • Revised Date : 2025-07-22
  • Accepted Date : 2025-07-23
  • DOI :https://doi.org/10.7734/COSEIK.2025.38.5.297
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