000009667 001__ 9667
000009667 005__ 20141205153142.0
000009667 04107 $$aeng
000009667 046__ $$k2008-10-12
000009667 100__ $$aChang, Dyi-Wei
000009667 24500 $$aPushover Analysis of Curved Steel Bridges for Evaluating Seismic Performance and Unseating Prevention

000009667 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009667 260__ $$b
000009667 506__ $$arestricted
000009667 520__ $$2eng$$aDemand on existing bridges for seismic capacity evaluation becomes more crucial and imperative. On the other hand, the performance-based philosophy has been accepted as a more reasonable design concept for engineering structures. For this purpose, capacity evaluation, as a result, and demand prediction procedures for civil engineering structures under earthquake excitations are of great significance. This paper describes a displacement-based seismic performance verification procedure including capacity and seismic unseating predictions for curved steel bridges and investigates its applicability. Prevailing pushover analyses procedure is employed as a primary tool to investigate the bridge’s behaviors under seismic input. A failure criterion for steel members incorporated with the effect of local buckling is considered in the analytical model and an equivalent single-degree-of-freedom system with a simplified bilinear hysteretic model formulated using pushover analyses results is introduced to estimate the displacement capacity and maximum potential unseating mechanism of curved steel bridges under major earthquakes. To check the accuracy of the proposed method, seismic capacities and demands from multi-degree-of-freedom time-history analyses with artificial design earthquake inputs modeling major earthquakes are used as benchmarks for comparison. By a case study, it is clarified that the proposed prediction procedure can give accurate estimations of displacement capacities and demands of the curved steel bridge in the transverse direction, while insufficient tally with for the longitudinal direction, which confirms the conclusion drawn in other structure types about the applicability of pushover analyses.

000009667 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009667 653__ $$aseismic evaluation procedure, seismic performance, curved steel bridge, seismic capacity, pushover analyses

000009667 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009667 720__ $$aChang, Dyi-Wei$$iLin, Yew-Tsang$$iDzeng, Dzong-Chwang$$iLin, Cheng-Wei
000009667 8560_ $$ffischerc@itam.cas.cz
000009667 8564_ $$s206519$$uhttps://invenio.itam.cas.cz/record/9667/files/05-02-0118.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 05-02-0118.
000009667 962__ $$r9324
000009667 980__ $$aPAPER