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Development of Performance-Based Seismic Design of Ordinary Standard Bridges
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2018-12-01
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[PDF-40.29 MB]
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Edition:Final Report, 5/1/2016-4/30/2018
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Abstract:Driven by the necessity to meet changing public expectations in the wake of natural disasters, such as earthquakes, the structural engineering community is moving towards more rational, risk-informed, and transparent approaches to structural design, amidst which probabilistic performance-based seismic design (PBSD) has emerged as the most scientific and promising one. However, performance-based earthquake engineering (PBEE), owing to its esoteric nature, has faced issues of impeded implementation in seismic design practice, especially in the area of bridge engineering. The main objective of this research is to lay the groundwork for the formulation of a simplified, yet rigorous, framework for risk-targeted PBSD of Ordinary Standard Bridges (OSBs) in California. Rooted in the formulation of this design framework is the PBEE assessment methodology, developed at the Pacific Earthquake Engineering Research (PEER) Center, integrating site-specific seismic hazard analysis, structural demand analysis, and damage analysis in a comprehensive and consistent probabilistic framework. Following an implementation of the PEER PBEE methodology, incorporating various improvements from the state-of-the-art literature related to its various steps, and an application of it for the damage hazard assessment of four distinct OSBs in California, a parametric full-blown probabilistic seismic performance assessment of the testbed bridges is carried out to investigate the effects of varying key, or primary, structural design parameters on the estimated damage hazard. The parametric study indicates irregular levels of conservativeness exhibited by the as-designed testbed bridges and illustrates the need for a PBSD framework for OSBs such that explicitly stated risk-targeted performance objectives are consistently satisfied by the population of OSBs in California. Finally, a simplified risk-targeted PBSD methodology is distilled out of this project which can be used to: (i) locate a feasible design point in the primary design parameter space of a bridge being designed for multiple risk-based performance objectives; and (ii) delineate a feasible design domain containing other acceptable design options in the primary design parameter space thereby facilitating risk-informed design decisions/adjustments. It is believed that the adoption of the proposed PBSD methodology, although nontraditional in its format, will be extremely beneficial in the medium and long-term. This initial venture will also prove to be crucial in supporting and fostering future research work and innovative technological developments in bridge infrastructure engineering.
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