Statistical and Mechanistic Fragility Analysis of Concrete Bridges

This report represents dynamic progressive failure modes that are defined and used for interpreting fragility characteristics of typical Caltrans’ bridges of various dimensions and configurations. To investigate the effect of ground motion intensity on the variation of bridge response behavior, a model bridge is analyzed under ground acceleration time histories at different levels of annual exceedance probability. The bridge is analyzed as a system with the aid of finite element method integrating appropriate nonlinear elements to represent plastic hinge formation at the column ends, pounding at the expansion joints and restrainer failures. The analysis shows that the dynamic progressive failure represents important progression of bridge failures.

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