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近场地震动估计中高、低频地震动的叠加
Superposition of ground motions of low and high frequencies in near-field ground motion prediction
【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。
【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.
【Key words】 superposition of ground motion; filtering; differentiation; integration;
- 【文献出处】 自然灾害学报 ,Journal of Natural Disasters , 编辑部邮箱 ,2011年04期
- 【分类号】TU311.3
- 【被引频次】2
- 【下载频次】121