关键词: 连续刚构桥, 地震响应分析, 非一致激励, 动水, 桩土耦合

Abstract: The non-uniform seismic response of long-span continuous rigid-frame bridge with high-rise pier in deep water is discussed.Based on the characteristics of high-rise pier in deep water,a formula applicable to calculating seismic hydrodynamic pressure of deep water pier is worked out.And the added mass method is adopted in the finite element model to evaluate the effect of hydrodynamic pressure during earthquakes.The non-uniform excitation and pile-soil interaction are also taken into account during the analysis.Aided by general finite element software ANSYS,a non-uniform excitation time-history response analysis on certain continuous rigid-frame bridge is taken as an example to verify the proposed method.The two analytical results are compared in the cases of hydrodynamic pressure and without hydrodynamic pressure.It shows that the internal force and displacement of seismic response are bigger when considering the hydrodynamic pressure than that in the case without considering the hydrodynamic pressure.This can provide reference to the seismic design of continuous rigidframe bridge.

Key words: long-span continuous rigid-frame bridge, seismic response, non-uniform excitation, dynamic water, pile-soil interaction