SMA-橡胶支座恢复力的实用模拟

Numerical simulation for restoring force of a SMA-rubber bearing

SMA-橡胶支座是一种可利用记忆合金超弹性滞回进行耗能的隔震装置。在概念设计的基础上,进行了SMA-橡胶支座的拟静力试验,证实了这一支座具有良好的隔震耗能特性。为了使SMA-橡胶支座的性能特点便于结构工程师所掌握,将线性最小二乘数据拟合技术和结构分析软件中常见的微分型恢复力模型用于模拟其水平力,数值计算所得到的恢复力-位移滞回曲线及支座性能参数值与试验结果吻合良好。可见,引入上述实用模拟方法有助于利用现有结构分析软件建立SMA-橡胶支座隔震单元,从而促进了这种隔震支座在实际工程中的应用。

SMA-rubber bearing is a type of seismic isolation device dissipating energy with hysteretic effect of superelastieity of shape memory alloy （SMA） material. Based on an isolator＇s concept design, a series of pseudo-static tests for a SMA-rubber bearing were conducted and its excellent seismic isolation and energy dissipation performances were verified with the test results. For structural engineers to gain the mastery of seismic isolation characteristics of SMA-rubber bearings , the linear least square data fitting technique and the differential restoring force model commonly known in structural analysis software were used to simulate horizontal force of an isolator. Then, its restoring force-displacement hysteresis loop and performance parameters were compared with those of the test data. It was found that the test results match closely with those obtained from the above-mentioned simulation. Thererfore, the proposed simulation method was helpful for establishing an SMA-rubber isolator element with the existing structural analysis software and application of SMA-based isolation bearings in engineering structures.