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ASSESSMENT ON ASEISMIC PERFORMANCE OF REGULAR STRUCTURES BY IMPROVED CAPACITY SPECTRUM METHOD
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摘要: 通常结构抗震性能评估的能力谱方法只能考虑结构的第一振型,不能考虑高振型对结构反应的影响,因而得到的结果具有一定的误差。通过引入等效振型和等效振型参与系数,建立一种可以考虑高振型影响的等效单自由度体系,利用结构抗震性能评估的能力谱方法对结构进行抗震性能评估。这种方法可以避免对结构进行复杂的非线性动力时程分析,而且能够得到比动力时程分析更多的结构抗震信息。实例分析表明,在结构的弹性反应阶段高振型对结构位移反应的影响并不显著,但是在非弹性反应阶段,高振型对结构位移反应有较大的影响;通常能力谱方法得到的评估结果比结构的实际反应要小,偏向于不安全的一面,建议的方法能够得到比较合理的结果。Abstract: The usual capacity spectrum method of structural seismic performance evaluation can only consider the first response mode of structures,and the influence of high modes can not be taken into account,so the error is introduced.A new type of equivalent single-degree-of-freedom(SDOF) is set up using the equivalent mode and equivalent mode participation coefficient.Then the capacity spectrum method is used to evaluate the seismic performance of structures.The method can avoid the nonlinear dynamic time-history analysis,and can get more seismic information on structures comparing with the latter.The example analysis shows that the high modes have little influence on the structural response in the elastic stage but have major influence in the inelastic stage,and the example also shows that the response obtained using the usual capacity method is smaller than the actual response of structures,so it biases toward the insecurity,while the rational result can be got by the improved capacity spectrum method aseismic.
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