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在计算能力谱方法需求曲线时,考虑了基于结构等效阻尼比和R--μT关系2种对弹性反应谱的折减方式,并对结构进行非线性时程分析作为比较依据.结果表明,采用能力谱评价方法对多层结构进行抗震能力分析是可行的,在弹性范围,2种折减方式所得结果基本一致,进入塑性后,有较大差别.传统能力谱法考虑等效阻尼比低估了结构的变形,有较大误差,主要原因是等效阻尼比的计算假设和实际阻尼表现不符,由于R-μ-T关系的改进能力谱法和时程分析结果基本吻合,在对结构进行抗震能力评价时,采用考虑R--μT关系的改进方法可有效地提高精度,满足工程需要.
In the calculation of demand curve of energy spectrum method, two ways to reduce the elastic response spectrum based on the structure equivalent damping ratio and R - μT relationship are considered, and the nonlinear time history analysis of the structure is taken as a comparison basis. It is feasible to use seismic profiling method to evaluate the seismic capacity of multi-story structures. In the elastic range, the results obtained by the two kinds of reduction methods are basically the same, and there are great differences after entering the plasticity. The traditional ability spectrum method considers the equivalent damping ratio underestimated The main reason is that the calculation assumption of equivalent damping ratio is not consistent with the actual damping performance. Because the improvement of R-μ-T relationship between the ability spectrum method and the time-history analysis results is basically consistent, In the evaluation of seismic capacity, the improved method considering the relationship of R - μT can effectively improve the accuracy and meet the engineering needs.