Probabilistic performance-based optimum seismic design with application to the California High-speed Rail prototype bridge Li, Yong; Conte, Joel P.
Seismic isolation provides a potentially promising strategy to mitigate the seismic risk to California High-speed Rail (CHSR) bridge structures. Notably, a proper selection of the seismic isolator properties must be carried out to strike a trade-off between the beneficial and detrimental effects of seismic isolation while accounting for the uncertainties associated with the seismic loading. Building upon a three-dimensional detailed nonlinear finite element (FE) model of a California Highspeed Rail (CHSR) prototype bridge, including soil-foundation-structure interaction (modeled using the dynamic p-y approach) and rail-structure interaction, a comprehensive parametric probabilistic seismic demand hazard analysis was performed for this bridge located at San Jose, California. A proposed next-generation approach, i.e., Probabilistic Performance-based Optimum Seismic Design (PPOSD) framework, is applied to the CHSR Prototype Bridge, within the context of the Performance-Based Earthquake Engineering (PBEE) methodology developed at the Pacific Earthquake Engineering Research (PEER) center. Through the application of the PPOSD framework to the CHSR Prototype Bridge, a well-posed optimization problem is proposed for the optimal seismic isolator parameters and solved through grid-based brute-force approach.
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