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Title |
Seismic Fragility Analysis by Key Components of a Two-pylon Concrete Cable- stayed Bridge
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Authors |
신연우(Yeon-Woo Shin) ; 홍기남(Ki-Nam Hong) ; 권용민(Yong-Min Kwon) ; 연영모(Yeong-Mo Yeon) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.4.26 |
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Keywords |
취약도 곡선; 손상등급; 사장교; 비탄성 시간이력해석 Fragility curve; Damage state; Cable-stayed; Nonlinear time history analysis |
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Abstract |
This study intends to present a fragility analysis method suitable for concrete cable-stayed bridges by performing an analysis reflectingdesign criteria and material characteristics from the results of inelastic time-history analysis. In order to obtain the fragility curve of the cable-stayedbridge, the limit state of the main component of the cable-stayed bridge is determined, and the damage state is classified by comparing it with theresponse value based on inelastic time history analysis. The seismic fragility curve of the cable-stayed bridge was made by obtaining the probabilityof damage to PGA that the dynamic response of the vulnerable parts to input ground motion would exceed the limit state of each structural member. According to the pylon's fragility curve, the probability of moderate damage at 0.5g is 32% for the longitudinal direction, while 7% for the transversaldirection, indicating that the probability of damage in the longitudinal direction is higher in the same PGA than in the transversal direction. The seismicfragility curve of the connections showed a very high probability of damage, meaning that damage to the connections caused by earthquakes is verysensitive compared to damage to the pylon and cables. The cable's seismic fragility curve also showed that the probability of complete damage stateafter moderate damage state gradually decreased, resulting in less than 30% probability of complete damage at 2.0g.
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