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地震动持续时间定义中的几个问题 总被引：1，自引：0，他引：1
1.引言人们在分析强震资料时,首先研究的是地震动的峰值,其次是频谱特性,随着震害经验的积累,人们逐渐认识到了地震动持续时间对震害的影响。由于地震动的振幅和频谱的定义较明确,因而研究得较多,可持时的定义不统一,因而持时的研究处于众说纷纭的阶段。 2.持时研究的现状 相似文献
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本文在系统地总结了前人关于地震烈度衰减关系研究的基础上,将长轴烈度衰减关系变为短轴仍采用常规形式,对长短轴分别回归,并给出了西北地区的回归结果。经过这样处理后的烈度衰减关系具有如下特征:在震中,长短轴烈度相等,在远场,长短轴烈度曲线相交,即椭圆等震线变成了圆,而且不同震级的等震线在蜕化成圆时所对应的震中距也不同。将该烈度衰减关系用于甘肃某市的地震危险性计算,并与国家地震局危险性程序所得结果相比较,产生了如下差异:中等烈度值所对应的概率增大,高烈度所对应的概率略有降低。 相似文献
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Liquefaction testing at a saturated loess site was performed under the simulated earthquake ground motion induced by artificial
explosions with micro-time intervals. The time histories of ground acceleration, pore water pressure and the ultimate value
of residual strain were recorded and measured. The modified FEQdrain computation software was used to analyze the liquefaction.
Both the test and the analysis confirm the objective occurrence of loess liquefaction. Furthermore, the reliability of the
method of the loess liquefaction analysis based on FEQdrain and the model of pore water pressure development of saturated
loess are examined.
Supported by: China Ministry of Science and Technology (Granted No.2000-35), Registration No.for Publications of Lanzhou Institute
of Seismology, CSB:LC2002-001. 相似文献
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