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2024 Vol.37, Issue 3

Research Paper

Influence of Incidence Direction of Seismic Wave on the Probabilistic Seismic Fragility Assessment of Bridges

교량의 확률론적 지진취약도에 대한 지진파의 입사방향성의 영향

Sina Kong1
,
Yeeun Kim2
,
Sinith Kung2
,
Jiho Moon3
,
Jong-Keol Song4*
꽁 씨나1
,
김 예은2
,
꽁 씨닛2
,
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 2024. pp. 152-162
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Abstract

As the incidence direction of ground motion (or seismic wave) changes, the seismic response of the structure will also change according to that direction. In order to analyze the effect of the seismic response of the example bridge according to the direction of incidence of ground motion, the acceleration response spectra (Sa-T1) corresponding to the 1-second period obtained for various angles of incidence were obtained. Using Sa-T1, 40 sets of orthogonal pairs of horizontal component seismic waves corresponding to 5 types of percentiles were generated. Seismic vulnerability analysis of the bridge piers was performed by obtaining the seismic response of an example bridge according to the direction of incidence of ground motion. By analyzing the seismic vulnerability analysis of seismic waves corresponding to five types of percentiles, it was found that the median value of the seismic vulnerability curve differs by about 1.2 to 2.6 times depending on the incident direction of the seismic wave. In other words, depending on the incidence direction of seismic waves, the degree of damage to the bridge structure can vary by about 1.2 to 2.6 times.

Keywords
incidence direction
pier
seismic fragility
acceleration response spectra
damage state

지반운동의 입사방향 변화에 따라 구조물의 지진응답도 그 방향에 따라 변화할 것이다. 지반운동의 입사되는 방향에 따른 예제교량의 지진응답의 영향을 분석하기 위하여 다양한 입사각에 대하여 구한 1초 주기에 대응하는 가속도응답스펙트럼을 구하였다. 이를 이용하여 5가지 종류의 백분위수에 해당하는 1쌍의 직교하는 수평성분 지진파를 40세트 생성하였다. 지반운동의 입사방향에 따른 예제교량의 지진응답을 구하여 교각에 대한 지진취약도 해석을 수행하였다. 5가지 종류의 백분위수에 대응하는 지진파에 대한 지진취약도 해석을 분석하여 지진파의 입사방향에 따라서 지진취약도 곡선의 중앙값이 약 1.2~2.6배 정도 차이가 남을 알 수 있었다. 다시 말하면 지진파의 입사방향에 따라서 교량 구조물의 손상정도가 약 1.2~2.6배 정도 차이가 날 수 있음을 의미한다.

키워드
입사방향
교각
지진취약도
가속도 응답스펙트럼
손상상태
References
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Boore, D.M. (2010) Orientation-Independent, Nongeometric-Mean Measures of Seismic Intensity from Two Horizontal Components of Motion, Bull. Seismol. Soc. Am., 100(4), pp.1830~1835.

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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 : 37
  • No :3
  • Pages :152-162
  • Received Date : 2024-03-07
  • Revised Date : 2024-04-28
  • Accepted Date : 2024-05-14
  • DOI :https://doi.org/10.7734/COSEIK.2024.37.3.151
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