深水桥墩地震动水压力对大桥地震响应的影响分析

针对现行规范中桥墩总动水压力计算公式存在的不足,提出了考虑动水压力后桥墩随水深分布的计算公式,并在有限元计算模型中采用附加质量方法来考虑地震动水压力的影响,计算了某连续钢构桥的地震时程响应,比较了不考虑、考虑动水压力两种情况下桥梁地震响应的计算结果。结果表明,无论从位移还是内力来说,考虑动水压力后的地震响应均有较大增幅,因此在深水桥墩计算中必须考虑地震动水压力。

Study of Hydrodynamic Pressure for Bridge Pier in Deep Water and Its Effect on Seismic Response of Bridge

On the basis of the calculation method for the total hydrodynamic pressure of pier based on design code, a calculation formula for the distributional hydrodynamic pressure along with water depth was established. And then the additional mass method was used to consider the influence of distributional hydrodynamic pressure in finite element method. The seismic time history response of continuous rigid-frame bridge was analyzed. At the same time, the analytical results are compared in the cases of considering hydrodynamic pressure and without considering hydrodynamic pressure. The results show that the internal force and displacement of seismic response are larger when considering the hydrodynamic pressure. So, the influence of seismic water pressure in deep water pier must be considered.