Fragility Curves for Typical Multispan Simply Supported Bridge Classes in Moderate Seismic Zones: Pre- and Post-Seismic Design Considerations

Abstract eng:
Multispan simply supported concrete and steel girder bridges are common bridge types in Central and Southeastern United States. Probabilistic seismic risk assessment of these bridge classes is essential due to an increased awareness of the seismic hazard in the region. This study focuses on developing and comparing fragility curves for seismically and non-seismically designed bridges that are common in the region. Detailed three dimensional nonlinear analytical models, which account for the nonlinear behavior of the columns, girders and abutments, are developed in OpenSEES platform. Unlike most previous studies, the fragility curves are developed considering a wide range of material and geometric uncertainties in the stochastic analyses coupled with considerations of vulnerability of multiple components in defining bridge system performance. The results provide insight into the level of uncertainty introduced in the analysis of fragility curves for portfolios of bridges with the use of three dimensional analytical models and nonlinear time history analyses. Component and system fragility curves are obtained and are compared for the case of non-seismically and seismically designed bridge classes and with those currently used in HAZUS-MH.

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