Abstract：Based on the fluid-structure coupling of ice-water-bridge pier，the paper establishes the ice-water- bridge pier fluid-structure interaction dynamic equation of different ice thicknesses under earthquakes，and studies the effect of ice thickness on dynamic response and hydrodynamic pressure with a rectangular pier as the research object. The result shows that，under the seismic loading，the larger the ice thickness，the greater the bending moment and shear farce at the bottom，the greater the hydrodynamic pressure at the side of the pier. When the ice thickness is more than 0.5 m，ice thickness of pier has more remarkable effect on bending moment and shear farce of the bottom，and the rate of bending moment and shear fore at the bottom are 88.71% and 98.15%，respectively，but has nearly no effect on the hydrodynamic pressure in the side of the pier. At the same time，the larger the ice thickness，the greater the displacement and acceleration along the pier. Therefore，the bridge seismic design in the ice water should consider the seismic response of structure influence when the ice thickness is more than 0.5 m.
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2014, Vol. 33 
