基础隔震结构等效线性化方法研究

比较了8种基于非退化双线性模型的等效线性化方法,评价它们的等效周期、阻尼比、对位移反应的估计精度以及估计精度对模型参数的敏感性。结果表明,各种方法的估计精度受模型参数的影响明显,结合基础隔震结构的特征,建议在其反应谱分析方法中采用JPWRI法或Hwang法。另外,本文提出割线刚度-平均阻尼法和考虑初始周期影响的修正割线刚度-平均阻尼法,从而实现在更广的模型参数范围内给出更高的估计精度。

Research on Equivalent Linearization Methods for Base-isolated Structures

Eight equivalent linearization methods based on the non-degenerate bilinear model are compared in this paper.The equivalent periods,damping ratios,displacement response estimation accuracy and parameter sensitivity are evaluated.It is found that model parameters have significant effects on the estimation accuracy of each method.The JPWRI method and Hwang method are recommended in the response spectrum analysis method of base-isolated structures.The Secant Stiffness-Average Damping method and Modified Secant Stiffness-Average Damping method are proposed in order to provide more accurate estimation in the wider range of model parameters.