超弹性滑动隔震系统在单层球面网壳结构中的减震性能研究

Study on seismic mitigation performance of superelastic-sliding isolation system in a singlelayer spherical lattice shell structure

为了改善球面摩擦隔震支座(spherical friction isolation bearing,SFIB)缺乏多道抗震防线以及在强震作用下易出现损伤的不足,使用形状记忆合金(shape memory alloy,SMA)改善SFIB的抗震性能,提出了一种超弹性-滑动摩擦隔震支座(superelastic-spherical friction isolation bearing,SSFIB)。对SSFIB的滞回性能开展了精细化有限元模拟,模拟结果体现出SSFIB较SFIB具备更优的耗能与控制能力。进而,将SSFIB系统用于周边支承单层球面网壳结构的高位隔震,同时,在该网壳结构中设置传统的SFIB,以进行对比分析。通过数值模拟对受控结构进行了非线性地震时程分析。研究结果表明,SSFIB系统在网壳结构中具有优良的减震性能。

Spherical friction isolation bearing(SFIB)lacks multi-defense for seismic resistance,it is easy to appear the isolation devices failure under strong earthquake.To overcome such drawbacks,shape memory alloy(SMA)is employed to improve the performance of the traditional isolator,and thus a new superelastic-spherical friction isolation bearing(SSFIB)is presented by combining the SFIB and SMA cables.The hysteretic behavior of the SSFIB is investigated through refined finite element simulation.The obtained cyclic response indicates that the SSFIB has better energy dissipation performance and control ability compared with the SFIB.Furthermore,the SSFIB system was applied to the high-isolation of a single-layer spherical lattice shells with surrounding columns.Meanwhile,the SFIB is used to the identical lattice shell structure for comparison study.The nonlinear seismic time-history analyses of the controlled structures are carried out via numerical simulation.The results show that the SSFIB system can be effective for seismic response mitigation of lattice shell structures.