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Research Paper

Effect of Pulse-like Ground Motions with Various Pulse Indicators on the Seismic Fragility of Bridges

교량의 지진취약도에 대한 다양한 펄스지표를 가지는 펄스형 지진의 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, 24341, Korea
2Graduate Student, Department of Civil Engineering, Kangwon National University, 24341, Korea
3Assistant Professor, Department of Civil Engineering, Kangwon National University, 24341, Korea
4Professor, Department of Civil Engineering, Kangwon National University, 24341, Korea
1강원대학교 건축･토목･환경공학부 박사과정
2강원대학교 건축･토목･환경공학부 석사과정
3강원대학교 건축･토목･환경공학부 부교수
4강원대학교 건축･토목･환경공학부 교수
*Corresponding Author
31 October 2024. pp. 327-335
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Abstract

Pulse-like ground motions cause significant damage to structures. The presence and intensity of velocity pulses in seismic acceleration records can be evaluated by calculating the pulse indicator (PI). The PI values ​​for the same earthquake differ by approximately 20 depending on the change in the incidence angle. In this study, PIs were evaluated according to changes in the incidence direction of seismic waves, and the seismic response and seismic fragility of bridge structures were evaluated using a pair of 40 seismic waves according to five PI percentiles (0, 25, 50, 75, and 100). The results show that as the PI of ground motion increases, the acceleration response spectrum also tends to increase proportionally. It was observed that the seismic response of the bridge increased with the PI of the seismic wave, which increased the seismic fragility. For seismic acceleration records with the maximum PI, the seismic fragility of piers tended to increase by approximately 25-27% on average compared to the case of seismic acceleration records with the minimum PI.

Keywords
velocity pulse
pulse indicator
incidence direction
bridge
seismic fragility++

펄스형 지진은 구조물에 손상을 크게 유발한다. 펄스지표의 계산에 의해 지진 가속도 기록에 대한 속도펄스의 존재 유무와 그 세기의 평가가 가능하다. 입사각의 변화에 따른 펄스지표 값이 동일 지진에 대하여 대략 20 정도 차이가 난다. 지진파의 입사각의 변화에 따른 펄스지표를 평가하고, 5가지 펄스지표 백분위수(0, 25, 50, 75, 100 백분위수)에 따른 한 쌍의 40개 지진파를 사용하여 교량구조물의 지진응답과 지진취약도 평가를 수행하였다. 펄스지표가 큰 지진파일수록 가속도응답스펙트럼 또한 이에 비례하여 증가하는 경향을 나타냄을 알 수 있다. 지진파의 펄스지표(PI)가 증가할수록 교량의 지진응답을 증가시켜 지진취약도를 증가시키는 경향을 나타냄을 알 수 있다. 최대 펄스지표의 지진파의 경우가 최소 펄스지표의 지진파의 경우에 비하여 교각의 지진취약도를 대략 평균적으로 25~27% 정도 증가시키는 경향이 있다.

키워드
속도펄스
펄스지표
입사 방향성
교량
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 : 37
  • No :5
  • Pages :327-335
  • Received Date : 2024-07-01
  • Revised Date : 2024-08-14
  • Accepted Date : 2024-08-22
  • DOI :https://doi.org/10.7734/COSEIK.2024.37.5.327
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