The analytical model for collapse analysis is taken into account for the effect of post-peak behavior due to reinforcement buckling and concrete spalling is developed based on the Applied Element Method (AEM). A multi-span bridge was simulated using the proposed model.  The analysis result shows a bridge pier designed according to 1964 Japan’s seismic design code has brittle shear failure mode and suffer much damage if it is subjected to the level 2 earthquake ground motion specified in Japan’s current seismic design code. In addition, the bridge pier designed according to current seismic design code does not collapse, although it is subjected to an extremely high seismic earthquake ground motion. However, a large relative displacement between a pier and deck results in deck falling

T. Kuroda, K. Meguro. “Numerical Study of Collapse Behavior of RC Bridges due to Extremely High Seismic Load Considering Post-Peak Behavior” BULLETIN OF EARTHQUAKE RESISTANT STRUCTURE RESEARCH CENTER, INSTITUTE OF INDUSTRIAL SCIENCE, NO. 37, (MARCH 2004).