Seismic Fragility of Existing Conventional Reinforced Concrete Highway Bridges

摘要

Seismic fragility is estimated for an existing conventional reinforced-concretehighway bridge using nonlinear-dynamic finite element analysis. The bridge selected for analysis is the Meloland Road Overcrossing located near El Centro, California. It is representative of a large class of two-span continuous bridges in California and other locations in the United States. The column supporting the deck is assumed to govern the damage state for the entire bridge. The column is about 20 ft high and has an outside diamter of 5 ft. Flexure is assumed to be the critical damage mode for the column. The fundamental response modes of the bridge affecting this damage mode involve a three-dimensional interaction between deck flexure/torsion and column flexure.