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Title |
Seismic Fragility Analysis by Boundary Conditions of a Two-pylon Concrete Cable-stayed Bridge
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Authors |
신연우(Yeon-Woo Shin) ; 홍기남(Ki-Nam Hong) ; 연영모(Yeong-Mo Yeon) ; 지상원(Sang-Won Ji) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.5.77 |
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Keywords |
취약도 곡선; 손상등급; 사장교; 비선형 시간이력해석 Fragility curve; Damage state; Cable-stayed; Nonlinear time history analysis |
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Abstract |
In this study, the seismic fragility curve according to the boundary conditions is created for a two-pylon concrete cable-stayed bridge, and the effect of the boundary conditions on the seismic fragility of the target bridge is evaluated. An analysis model for the target bridge is constructed using Midas Civil, and a nonlinear time history analysis is performed by applying the fiber element, concrete and rebar material models. The boundary conditions between the pylon and the stiffened girder are classified into four types: rigid, unconstrained, pot bearing, and seismic isolation bearing, and the seismic fragility curves are created for each boundary condition. The plastic hinge section of the pylon, the connection part, and the cable are selected as weak members, and the earthquake vulnerability curve is created for them. As a result of the analysis, it is found that the seismic isolation bearing model shows the lowest damage probability in the pylon and the connection part, and the seismic fragility of the cable is less affected by the boundary conditions than other members.
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