一、前言众所周知,位于水中或与水接触的结构比它在空气里显示不同的动力响应。因此在水中结构的抗震设计中,考虑地震时作用在结构上的动水压力是很重要的。关于坝-水库体系的动水压力荷载已有许多研究课题。它开始于威斯特嘎特(Westergaard)的经典工作,假定坝为刚性和无限长的,且地面是谐波运动。其动水压力假定和地面加速度反向并且等于和坝一 I. INTRODUCTION It is well known that structures that are in water or in contact with water show different dynamic responses than they do in air. Therefore, in the seismic design of underwater structures, it is important to consider the hydrodynamic pressure acting on the structure during an earthquake. There are many research topics on the hydrodynamic pressure load of the dam-reservoir system. It began with the classical work of Westergaard, assuming that the dam was rigid and infinitely long, and that the ground was a harmonic movement. The hydrodynamic pressure is assumed to be inverse to the ground acceleration and is equal to