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Probabilistic Risk Assessment of a Steel Composite Hybrid Cable-Stayed Bridge Based on the Optimal Reliabilities  

Yoon, Jung Hyun (한양대학교 토목환경공학과)
Cho, Hyo Nam (한양대학교 토목환경공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.19, no.4, 2007 , pp. 395-402 More about this Journal
Abstract
Probabilistic risk assessment was conducted on a hybrid cable-stayed bridge consisting of a steel-composite plate girder and a concrete girder with a long span, designed using the working stress design and strength design methods. The component reliabilities of the bridge's cables, pylons, girders, and steel-concrete conjunction were evaluated using the AFOSM(Advanced First Order Second Moment) algorithm and the simulation technique at the critical sections, based on the maximum axial force, shear, and positive and negative moments of the selected sections. For the analysis of system reliability, the hybrid cable-stayed bridge consisting of cables, pylons, and plate girders was modeled into combined failure modes, and for system reliability, the probabilities of failure and reliability index of the structural system were evaluated. Based on the results of this study, the critical failure modes of the hybrid cable-stayed bridge based on the bridge's structural characteristics are suggested, and the efficiency of the partial ETA technique for use in the risk assessment method was confirmed.
Keywords
Hybrid Cable Stayed Bridge; Risk Assessment; System Reliability; AFOSM; Partial ETA technique;
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