Liquefaction Effects on Lateral Pile Behavior for Bridges
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A coupled pile-soil-structure interaction (SPSI) analysis method is presented to study the liquefaction effects on lateral pile behavior of the highway bridges. Pile-soil interaction is simulated by the dynamic nonlinear p-y method including the effect of liquefaction. The liquefaction effects to the pile-soil interaction are taken into account by introducing a degradation multiplier to the p-y curve. The degradation multiplier is related to the excess pore water pressure buildup at the pile-soil interface. The SPSI analysis method is implemented into a Missouri highway bridge site near the New Madrid Seismic Zone (NMSZ) rift complex for future earthquake scenarios of Mw 7.0. Synthetic motions at rock base were developed to the bridge foundation level for SPSI analyses. Results from analysis indicate that the degradation of p-y curve due to the excess pore water pressure significantly increases displacement of superstructure and moment of pile foundation.