PROGRESSIVE DAMAGE SIMULATION OF FOUNDATION PILE OF THE SHOWA BRIDGE CAUSED BY LATERAL SPREADING DURING THE 1964 NIIGATA EARTHQUAKE

摘要

The authors analyze a progressive pile damage of the Showa-bridge caused by post-liquefaction phenomena during the 1964 Niigata earthquake. In the analysis, using time histories of ground displacement and excess pore water pressure calculated, the authors conduct an elasto-plastic analysis of a pile subjected to external force from ground displacement. Simulation results provide a reasonable explanation not only of the observed plastic deformation of the pile, but also the progressive damage of the pile.