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损伤谱在结构抗震性能评估中的应用

, PP. 40-46

Keywords: 非线性损伤谱,模态推覆分析,能力谱法,延性

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Abstract:

改进能力谱法可以较好地评估结构抗震性能,在工程中得到了广泛的应用。本文在此基础上指出,由改进能力谱方法求得的延性是结构的延性需求,并不是结构的实际延性能力,不能以此代表结构在罕遇地震作用下的实际抗震能力。其次,基于弹塑性损伤反应谱(简称"RD谱"),结合模态Pushover分析,提出了基于RD谱的能力谱分析方法,通过RD谱分析所得的延性是结构的实际延性能力,从而可进行结构的抗震能力验算,并给出结构延性富余度的概念,即可明确结构经历某一级地震作用后体系所含的延性富余度。模态Pushover分析可有效地考虑结构高振型的影响,提高了结果的分析精度。最后,通过例题分析,说明了本文方法的方便性和可行性,文中分析结果反映了结构抗倒塌能力,通过与改进能力谱法的所得延性需求或位移需求进行比较,可求出结构体系所含的延性富余度。

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