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工程力学  2012 

基于位移目标的性态谱

DOI: 10.6052/j.issn.1000-4750.2011.03.0107, PP. 75-81

Keywords: 抗震设计,性态谱,地震需求,位移目标,弹塑性,预测,抗震性能评估

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Abstract:

达到位移目标时确定结构的地震需求,是性能抗震设计的一个重要课题。研究了结构位移目标,确定了位移性能目标参数,推导了单自由度结构体系的位移性能目标与周期的关系。将1085条地震波,输入到不同周期的单自由度弹塑性动力微分方程,调整地震动,反复迭代,达到位移目标,获得地震需求与周期、位移目标之间的函数关系,建立了具有统计意义的三维坐标下的性态谱,并拟合了性态谱的计算公式。研究表明:性态谱是反映不同位移目标下结构地震需求的一种有效方法。性态谱曲线随着结构周期的增大明显减小,并随着位移目标的增大,逐渐增大。性态谱曲线已无平台段,与场地的共振效应消失,场地对性态谱的影响总体不明显。性态谱可快速地、简便易行地预测达到不同性能目标时结构的地震需求,拟合的性态谱计算公式可进行结构抗震性能评估。

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