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工程力学  2014 

不同CMR的RC框架结构地震损失分析

DOI: 10.6052/j.issn.1000-4750.2013.09.0881, PP. 155-163

Keywords: 倒塌安全储备系数,地震损失,易损性,增量动力分析,倒塌概率

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Abstract:

为研究结构抗倒塌储备能力对减小结构地震损失的作用,提出基于结构抗倒塌能力储备系数(CMR)的钢筋混凝土框架结构地震损失分析方法。利用IDA方法,确定结构在连续地震强度下的易损性,根据结构的破坏概率及易损性曲线计算地震经济损失。将结构抗倒塌能力指标CMR与结构在给定地震强度下的经济损失相结合,建立基于CMR的地震损失模型。对脆性及延性结构的倒塌特性和地震损失进行了系统地对比分析。通过四个RC框架结构分析,结果表明:地震损失评估与结构的CMR具有密切关系。在给定地震强度作用下,结构地震损失随CMR的增大而减小;CMR较小的结构随地震强度的增大损失增加较快,而CMR较大的结构则随地震强度的增大损失增加相对较平缓。所提出基于结构CMR地震损失评估思想可以作为量化地震损失评估较有前景的改进方法。

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