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Title |
Seismic Response and Vulnerable Cable Identification of Steel-composite Cable-Stayed Bridges Based on Measured Buan Earthquake Ground Motions
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Authors |
박원주(Won-Joo Park) ; 이덕근(Deok-Keun Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.4.43 |
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Keywords |
부안지진; 강합성 사장교; 응답스펙트럼해석; 시간이력해석; 지진응답 Buan earthquake; Steel-concrete composite cable-stayed bridge; Response spectrum analysis; Time history analysis; Seismic response |
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Abstract |
In this study, an artificial ground motion was generated by scaling the magnitude 4.8 earthquake that occurred on June 12, 2024, in Buan-gun, Jeollabuk-do, to the design-level spectrum. Using the artificial ground motion reflecting the frequency characteristics of the Buan earthquake, response spectrum analysis (RSA) and time history analysis (THA) were conducted on an in-service offshore steel-concrete composite cable-stayed bridge. Seismic responses of the pylon, stiffening girder, and stay cables were investigated. For validation of the numerical model used in dynamic seismic analysis, measured natural frequencies of the bridge were compared, and the average error up to the sixth vertical mode was 3.72 %, confirming the adequacy of the model. Nonlinear time history analysis was performed to evaluate the variation in cable tension and stress, as well as safety factors for individual cables, and the optimal locations for installing cable force sensors were discussed.
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