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选择2008年5月12日汶川地震四川台站中峰值加速度值大于200Gal的18组水平地震动记录,对周期为1.0s、阻尼比为5%的双线性SDOF体系,利用时程分析方法分别计算其有代表性的地震响应指标,如加速度、速度和位移,利用统计分析方法研究不同地震动强度指标,如峰值加速度、累积绝对速度、Arias强度、速度谱强度、加速度谱强度、均方根加速度、特征强度及Housner强度等与线性、非线性响应最大值的相关性。结果表明,不同地震动强度指标与SDOF体系最大响应的相关性差别很大,其中速度谱强度、Housner强度与SDOF体系最大响应的相关性较好,而加速度谱强度、峰值加速度与SDOF体系最大响应的相关性较差。另外,速度谱强度和Housner强度对SDOF体系非线性最大响应的相关性明显好于其对于线性体系最大响应的相关性。因此,对传统的基于峰值加速度选择和调整时程分析输入地震动记录的合理性及可靠性需进一步探讨。
18 groups of horizontal ground motion records with peak acceleration of more than 200Gal in Wenchuan earthquake on May 12, 2008 were selected. For the bilinear SDOF system with period of 1.0s and damping ratio of 5%, time-history analysis Calculate the representative seismic response indexes such as acceleration, velocity and displacement, and use statistical analysis methods to study different ground motion strength indexes such as peak acceleration, cumulative absolute velocity, Arias intensity, velocity spectrum intensity, acceleration spectrum intensity, root mean square Acceleration, characteristic intensity and Housner intensity and the linear and non-linear response maximum correlation. The results show that the correlation between different ground motion strength indexes and the maximum response of SDOF system is quite different. The correlation between velocity spectrum strength and Housner strength is the best, while the acceleration of acceleration spectrum, peak acceleration and SDOF system maximum response The relevance is poor. In addition, the correlation of velocity spectrum intensity and Housner intensity to the nonlinear maximum response of the SDOF system is significantly better than that of the maximum response to the linear system. Therefore, the rationality and reliability of traditional ground motion records based on peak acceleration selection and adjustment of time-history analysis need to be further explored.