基于改进型SMA-三重摩擦摆隔震支座的层间隔震结构地震响应分析

摘要

基于三重摩擦摆隔震支座的优缺点以及SMA螺旋弹簧的特性,提出了一种改进型SMA-三重摩擦摆隔震支座,介绍了改进型SMA-三重摩擦摆隔震支座的构造特点和力学原理,并以大底盘单塔结构为例,利用SAP 2000软件分别建立了普通抗震结构、层间隔震结构两种结构模型,通过在罕遇地震作用下的动力时程分析,得出两种结构在地震作用下的不同响应(层间位移、楼层加速度、层间剪力、能量耗散),并对结果进行了对比分析.结果表明,改进型SMA-三重摩擦摆隔震支座具有良好的隔震效果.本文为这类工程的实际应用提出了可行性建议.%Based on the advantages and disadvantages of the triple friction pendulum isolation bearings and the characteristics of SMA spring,the modified SMA-triple friction pendulum isolation bearing was proposed.Its constructional characteristics and mechanics principle were described.Taking single tower frame structure with a large podium as an example,the two models of a common structure and a story isolation structure were established based on SAP 2000 program.According to earthquake time-history analysis,the response of interlayer displacement,acceleration,interlayer shear force and energy dissipation of the two type structures were given and the numerical results of the two type structures were compared in order to assess the damping effect of these structure.It shows that the story isolation structure with modified SMA-triple friction pendulum isolation bearing can improve the damping effect of the structure.The feasible suggestions are given on the application of projects.