一种基于谱加速度均值的新型地震动强度指标的提出及应用

Proposal and application of a new type of Intensity Measure based on the mean of spectral acceleration

为了提高地震作用下地震动强度指标(IM)与结构损指标(DM)的相关性,本文提出一种基于谱加速度均值的新型地震动强度指标。通过弹塑性反应谱对IM参数进行修正,并通过应用于一榀框架的增量动力分析来判断修正效果。结果表明:在地震作用下,新型指标与结构响应相关性更强。本文研究成果可为提高结构抗震性能分析及倒塌概率评估结果可靠性提供一定的借鉴与参考。

In order to improve the correlation between Intensity Measure(IM)and structural damage index(DM)under the action of earthquake,a new type of vibration intensity indicator based on the mean of spectral acceleration is proposed.IM parameters are modified by elastic-plastic response spectrum,and the effect of modification is judged by incremental dynamic analysis of single frame.The results show that,under the action of earthquake,the new index has stronger correlation compared with structural response.The results can provide a certain reference for improving the reliability of the structural seismic performance analysis and collapse probability evaluation results.