【摘要】 研究了近场地震动场估计中高、低频地震动叠加过程中的4个问题,分别是高频地震动位移和速度时程的计算方法、滤波与微分或积分的顺序、叠加与微分或积分的顺序以及传递函数与叠加的顺序问题。最后,基于这4个问题的分析研究,提出了一个适合大型工程场地地震动估计的高、低频合成方案,该方案能在确保结算结果精度的同时最大程度地节省工作量。更多还原

【Abstract】 Four issues in the superposition of ground motions of low and high frequencies in near-field ground motion prediction were studied:(1)the method to calculate the displacement and velocity time histories in high frequencies;(2)the sequence of filtering,integration or differentiation;(3)the sequence of superposition,integration or differentiation;(4)the sequence of superposition and multiplying transfer function.Finally,a detailed scheme of superposition for the ground motion prediction of a large-scale engineering project was proposed based on the analysis of the four issues,which could save the computing time as well as ensure the precision of result.更多还原