SMA-橡胶复合支座在空间网壳结构中的隔震研究

Seismic Isolation of SMA-rubber Bearings in Spatial Lattice Shells

为了减轻大跨屋盖地震灾害,在综合普通橡胶支座与形状记忆合金(SMA)特点的基础上,提出并设计了一种SMA-橡胶复合隔震支座,给出了隔震支座的力学模型.将设计的复合支座应用于空间网壳结构,探讨了其隔震控制理论,建立了隔震网壳结构的运动方程.通过对一单层柱面网壳的隔震分析表明,SMA-橡胶复合支座可有效减小网壳结构的地震响应,并且比普通橡胶支座具有更好的隔震效果.

In order to reduce the seismic damages of long span roofs, the seismic isolation bearings are used. A new type of SMA-rubber bearing is designed by incorporating shape memory alloy (SMA) with ordinary laminated rubber pads. A mechanical model of the bearing is set up. Then, the new bearing is applied to lattice shell structures to investigate its seismic isolation performance for spatial structures. Seismic isolation equations for spatial lattice shells are derived. Through analyses on a single-layer cylindrical lattice shell, it is shown that seismic responses of lattice shell structures can be effectively reduced by using SMA-rubber bearings. The study also indicates that the developed SMA-rubber bearing provides superior performance than ordinary rubber bearing.