Abstract
Computed on the ABAQUS finite element software, took the large group piles foundation of the Changjiang river road bridge as the research project, based on the Morison equation, using the added water mass method to consider the effects of hydrodynamic pressure, selecting three earthquake wave with different spectrum, considering dynamic nonlinear characteristics of soils and concrete, building the finite element model of the bridge group piles foundation earthquake hydrodynamic pressure effect, analyzing the hydrodynamic pressure effect of the large group piles foundation for bridge on deep overburden layers. The results show that hydrodynamic pressure effect changes the seismic responses characters of the group piles foundation; it has the impact on the acceleration, displacement and inner force of the pile more or less. It is much more comply with the actual situation considering the hydrodynamic pressure effect in the seismic design of large bridge foundation.
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