并联复合隔震结构的地震响应和滞回特性分析

在建立并联复合隔震结构运动微分方程的基础上,通过数值模拟,计算并研究了不同加速度峰值下,给定摩擦承压比的多自由度并联复合隔震结构的自振周期、最大基底剪力、最大基底剪力系数、最大层间位移、层间速度、层间加速度等地震响应以及隔震层的滞回特性,并与普通抗震结构、夹层橡胶垫隔震结构、摩擦滑移结构进行了全面对比分析和讨论。结果表明:并联复合隔震结构由于充分利用了复合隔震支座的优点,能够显著降低结构的地震响应,并且具有优良的滞回耗能特性。

SEISMIC RESPONSE AND HYSTERETIC PERFORMANCE ANALYSIS OF PARALLEL COMPOSITE ISOLATED STRUCTURE

The differential equation of motion for parallel composite isolation structure was formulated firstly. Then, taking the multi-degree of freedoms parallel isolated structure with a given friction bearing ratio for an illustrative example,the seismic responses under different acceleration peak values,such as natural period of vibration,the maximum base shear,the maximum base shear coefficient,the maximum displacement,velocity and acceleration, and the hysteretic performance were calculated and studied by numerical simulation method. And the calculation results were compared with those of ordinary aseismic structure,isolated structure with laminated rubber bearings and isolated structure with friction sliding bearings comprehensively and discussed in detail. Finally,some conclusions were made that the isolation effect of parallel composite isolated structure could reduce the seismic response dramatically due to the full use of the merits of composite isolated bearings,and the hysteretic energy dissipation performance was also excellent.