摩擦承压比对并联复合隔震体系隔震性能的影响研究

EFFECT OF FRICTION BEARING RATIO ON SEISMIC ISOLATION PERFORMANCE OF PARALLEL COMPOSITE ISOLATION SYSTEM

为了解摩擦承压比对并联复合隔震体系隔震性能的影响,采用时程分析方法开展不同地震动加速度峰值下不同摩擦承压比的并联复合隔震体系地震响应的数值模拟研究,深入分析并讨论并联复合隔震体系的不同摩擦承压比对基底最大剪力系数、基底最大位移、隔震层滞回特性以及并联复合隔震体系非线性性能的影响。计算和分析结果表明:摩擦承压比是影响并联复合隔震体系隔震性能的关键因素,可根据摩擦承压比的不同,设计出不同参数的并联复合隔震体系,在合理的摩擦承压比取值范围内并联复合隔震体系具有良好的隔震性能。此外,并联复合隔震体系的基底最大剪力系数与摩擦承压比之间存在一个最优关系,并联复合隔震体系的非线性特性与摩擦承压比的大小及地震动加速度峰值大小有关。

In order to investigate how the friction bearing ratio affects the seismic isolation performance of parallel composite isolation system, the numerical simulation was carried out by the time-history analysis method, in which the seismic responses were calculated for parallel composite isolation systems with different friction bearing ratios under different seismic acceleration peak values. Then, the effects of different friction bearing ratios on the maximum base shear coefficients and the maximum base displacements, the hysteretic characteristics and nonlinear properties were analyzed and discussed. The results show that the friction bearing ratio is a key factor affecting the isolation performance;different parallel composite isolation systems can be designed according to friction bearing ratios and thus provide good isolation performance within reasonable range of friction bearing ratios. Moreover, there is an optimal relation between the maximum base shear coefficient and the friction bearing ratio, and the nonlinear properties are closely related to the friction bearing ratio and seismic acceleration peak value.