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空间相关多点多维地震动的模拟

DOI: 10.13197/j.eeev.2014.04.64.lizx.009, PP. 64-72

Keywords: 地震动,空间相关,场地效应,多点多维,功率谱密度,数值模拟

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Abstract:

对大跨度结构的地震响应分析应考虑地震动的空间效应。采用合理的功率谱、相干函数和传递函数模型,基于原型谱表示法,得到基岩和地表处的空间相关多点多维人工地震动模拟方法,并通过实例验证模拟方法的可行性。结果表明局部场地条件对入射波产生放大和过滤效应,导致其振幅和频率成分明显改变,在特定的场地条件下,其影响远大于行波效应和相干效应;在对大跨度结构进行地震响应分析时,采用合理考虑局部场地效应的空间相关多点多维地震动模型作为激励输入是非常必要的;在采用数值方法模拟人工地震动时,由于相干函数存在临界值,可以将多维多点地震动简化为三个单维多点地震动的模拟。该模拟方法可以作为实际工程中大跨度结构的地震响应分析获得地震输入的一种有效途径。

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