考虑动水压力影响的单柱式桥墩地震反应分析

在Morison方程的基础上,用附加水质量法考虑动水压力对桥墩的影响,以单柱式桥墩为研究对象,以ABAQUS有限元软件为计算平台,建立了考虑桩-土动力相互作用的单柱式桥墩地震反应分析模型,考虑土体和桥墩混凝土的动力非线性特征,分析了地震动作用下动水压力对单柱式桥墩的墩顶相对墩底位移、加速度、剪力和弯矩反应的影响,并探讨了水位对单柱式桥墩地震反应特性的影响。结果表明:动水压力改变桥墩的地震反应特性,增大了桥墩顶部相对底部的位移、墩顶绝对加速度和墩底的内力,水位变化影响桥墩的地震反应特性。对于深水桥墩抗震设计计算,考虑动水压力效应、水位变化是有必要的。

Seismic responses of single-column pier considering the effects of hydrodynamic pressure

On the basis of the Morison equation, using the additional mass method of water to consider the effects of hydrodynamic pressure on the bridge pier,taking the single-column pier as the research project,with the help of the ABAQUS finite element software,the authors established the seismic response analysis model of the soil-column pier considering the pile-soil dynamic interaction,and the dynamic nonlinear characteristics of soils and concrete.They analyzed the effect of hydrodynamic pressure on the relative displacement,acceleration,shear force,moment of the single-column pier under earthquake ground motion,and discussed the effect of water level on the earthquake response characteristics of single-column pier.The results show that the hydrodynamic pressure effect changes the seismic responses characters of the pier and increases the relative displacement and acceleration of pier top and also increases the internal force of pier bottom.It is necessary to consider the hydrodynamic pressure effect in the seismic design of pier.