Abstract
In the US, bridges classified as critical and irregular (in select seismic zones) are required to be designed for seismic loadings using time-history analysis. To promote use of time-history analysis in designs across wider ranges of bridge configurations and seismic site classifications, design-oriented tools are being developed. In this study, a multiple-support excitation algorithm was used in conjunction with the beam on nonlinear Winkler foundation model to compare piled substructure responses from an in-service integral abutment bridge, which was subjected to a parametric set of ground motions. The effects of spatially varying (versus non-spatially varying) ground motions on design-relevant response quantities were assessed, and the merits of conducting analyses with and without considerations for spatial variability in ground motions were emphasized. Based on the results presented, conditions were identified under which simplifying assumptions may be warranted in conducting nonlinear dynamic analysis for bridge seismic design.
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