采用模态分析和反应谱分析的方法，研究坝段两种工况下的自振特性、地震动位移和地震动应力响应的分布规律。
Modal analysis and spectrum analysis are applied to research the dynamic characteristics, and the distribution laws of seismic displacements and stress of water retaining section are analyzed.
关于地震动速度脉冲对结构的影响虽已有若干研究结果，但还没有应用到实际工程中，而关于地震动位移峰值对结构的影响则还没有见到相关研究成果的介绍。
Even if there are some conclusions about the effects of velocity pulse on structures, but it hasn't been applied in practice yet, and the effect of PGD on structures is barely on research.
地震动使海底倾斜土层软化、液化并产生永久变形和位移。
Soil softening and liquefaction due to earthquake cause permanent deformations and displacements of submerged slope.
从多维地震动输入下的结构三维振动方程出发，给出了结构多维随机振动的振型位移法和振型加速度法。
From the equation of three-dimensional vibration of structures, the methods of multi-dimensional random mode displacement and mode acceleration have been put forward.
研究结果表明：在简谐地面加速度作用下，高频地震动也可以引起长周期结构产生很大的位移反应，且最大位移反应出现在结构的瞬态自由振动阶段。
It is concluded that the transient response to a high frequency harmonic ground motion can increase greatly the displacement response of structures, particularly for the long period structures.
第二部分为地震动结束后到液化土中孔压消散时间所产生的地面位移。
Another is the ground displacement taking place after earthquake, which lasts from the end of earthquake to the period of excess pore pressures in sandy soil diffused out.
本文针对场地对地面震动影响的问题系统地论述了场地土对地震剪切波的影响及瑞雷波的位移方程；
This paper systematically treated consequence of Site Soil to earthquake shear wave for problem of consequence of site to earthquake shock of ground and displacement equation of Rayleigh wave;
本文针对场地对地面震动影响的问题系统地论述了场地土对地震剪切波的影响及瑞雷波的位移方程；
This paper systematically treated consequence of Site Soil to earthquake shear wave for problem of consequence of site to earthquake shock of ground and displacement equation of Rayleigh wave;
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