动水及桩-土-结构相互作用对跨江大桥稳定性的地震影响分析

为了得到更为符合实际情况的跨江大桥动力稳定性的地震反应分析,在桥梁抗震研究中必须综合考虑动水及桩–土–结构的相互作用。基于此,根据Poisson方程,利用Trefftz函数和微波理论建立求解地震中桥墩表面动水压力的计算方程;由线性化的Morison公式,给出计算地震中动水能量对桩体的波浪推力方程;同时,引入改进的Penzien模型,对桩–土–结构的地震效应进行分析。采用该方法对国内某跨江大桥进行动力反应时程分析,计算结果显示,该方法简单有效,且具有较高的计算精度。

SEISMIC RESPONSE ANALYSIS OF HYDRODYNAMIC AND PILE-SOIL-STRUCTURE INTERACTION FOR RIVER-SPANNING BRIDGE

In order to achieve the better response analysis of river-spanning bridge,the dynamic water and pile-soil-structure interaction are considered.Based on the Poisson equation,Trefftz functions and wavelet theory are used to form the equation to hydrodynamic pressure on pier which is induced by earthquake.Using the linear Morison equation,the formulas to study hydrodynamic energy of the wave forces on piles are proposed.Simultaneity,using the modified Penzien model,the seismic effect on pile-soil-structure was analyzed.Simulation of seismic response for a river-spanning bridge was analyzed with the given theory;and the simulated results show that this approach is simple and effective.