Based on the Potential flow theory,three dimensional finite element model of roundended hollow piers in deep water and considering pier-water interaction was established.The effects of dynamic water pressure on the natural frequency and dynamic response of bridge piers under different water levels were analyzed,when the bridge pier considering inner water,outland water and the inner water and outland water are considered at the same time.The influencing rules of seismic response of bridge piers were discussed,when the piers with different thickness and under the action of the inner water,outland water or the inner water and outland water are considered at the same time.Research has shown that the natural frequency of bridge pier is decreased and the dynamic response of bridge pier and the pier top displacement are obviously increased when the hydrodynamic effect is considered.The thinner the wall thickness,the influence of seismic response of bridge pier will be increased,and the effect of wall thickness on seismic response of hollow bridge piers is the biggest when the inner water is considered.The influence of inner water on seismic response of bridge piers can not be ignored,and suggested that the inner water and outland water should be considered at the same time in the calculation.%基于势流体理论建立考虑墩-水相互作用的深水圆端型空心桥墩三维有限元模型.分析桥墩考虑内域水、外域水及同时计入内、外域水时,不同水位下的动水效应对桥墩自振频率及动力响应的影响,并讨论桥墩壁厚不同时,内域水、外域水及同时考虑内、外域水作用对桥墩地震响应的影响规律.研究表明:动水效应使桥墩的自振频率下降,桥墩的动力响应和墩顶位移明显增大,且同时计入内、外域水的影响最大;桥墩的壁厚越薄,内域水和外域水及同时考虑内、外域水对桥墩地震响应的影响均会增大,三者相比,壁厚对考虑内域水作用的空心桥墩地震响应的影响最大;内域水对桥墩地震响应的影响不可忽略,建议在计算中同时计入内外域水的影响.
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