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• W2269486995 abstract "Earthquakes are a natural calamity, feared by most andcause great destruction in and around the seismic zone where theyoccur. Bridges, being an important component of the transportationsystem, are therefore required to be designed such that they canwithstand these large impacts and remain functional post-earthquakeevent. The present study is focused on conducting a parametricstudy and evaluating the performance of skewed bridges underseismic activities by considering the orthogonal effects innonlinear time history analysis, wherein, two seismic waves, in theform of time histories, act simultaneously at the structure atright angles to each other. Such a set of waves is known as theorthogonal set of time histories. Any one of the two seismic wavescan be assumed to be acting in a principal direction, i.e. alongthe direction of the ground motion. The other seismic wave, thus,acts in a direction perpendicular to it. Responses of the bridgeare obtained in the directions along the length of the bridge(longitudinal) and perpendicular to it (transverse). Theseresponses are statistically independent of each other. Forconducting the analysis, Painter Street Overpass located in RioDell, CA is modeled as a dual-beam stick bridge using OpenSees.After validating the analytical model, the bridge is subjected to asuite of orthogonal set of time histories developed for theCalifornia region. The angle formed by the seismic wave actingalong the principal direction, with the central axis of the bridge,in the longitudinal is called as the angle of incidence. This angleis made to rotate from 00 to 1800 with a step of 150. Skew angle ofthe bridge is defined as the angle made by the bents or abutmentswith the axis along the transverse direction of the bridge. Theabove procedure is repeated for different skew angles of the bridgevarying from 00 to 500 with a step of 100. The effect of thevariation of these two parameters on the response of the structureis analyzed to determine the critical angle of incidence for aground motion on the bridge. It is concluded that angle ofincidence, by itself cannot determine the critical response of thestructure, as critical angle of incidence, which generated thecritical response in the structure, varied for different groundmotions used for analysis. It is suggested to include a seismicparameter like peak ground acceleration (PGA) to the parametricstudy, to determine the combination that produces a criticalresponse. Fragility curves are developed in order to provideinsight into the vulnerability of the bridge to different seismicloading conditions. The effect of change in skew angle and angle ofincidence is studied on the fragility plots for different damagestates of the bridge, as described by HAZUS-MH, thus linking thevariation in PGA to the parametric study. It is derived thatinclusion of PGA in probabilistic terms results in obtaining arange of critical incident angle and skew angle, for which thecritical response can be generated in the structure. A study…" @default.
• W2269486995 created "2016-06-24" @default.
• W2269486995 creator A5018013411 @default.
• W2269486995 date "2013-04-05" @default.
• W2269486995 modified "2023-09-23" @default.
• W2269486995 title "Seismic Performance of Skewed Bridges under Orthogonal Ground Motion Components" @default.
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