含初始转角的隔震支座在双层柱面网壳结构中的隔震性能

为了研究大跨度空间结构中存在支座转动问题，通过含初始转角的橡胶隔震支座的双层柱面网壳结构研究了水平方向上结构水平地震反应。结合通过实验得出的经验公式对橡胶隔震支座水平性能进行修正，并通过SAP2000应用动力时程分析法，在考虑下部支承结构的情况，对含初始转角的橡胶隔震支座进行了参数分析。结果表明：水平地震作用下，较小转角的隔震支座的支座底部剪力峰值与加速度峰值会下降；随着转角增加，柱顶加速度峰值、隔震支座底部剪力峰值等迅速增加；而跨高比大的网壳结构会放大初始转角对结构的影响，加大结构整体的加速度峰值和结构柱的位移峰值，但限制上层网壳结构的位移峰值。因此在考虑初始转角的情况下，若需要限制网壳结构加速度或位移，设计时需要将网壳结构跨高比的放大效应纳入考虑范围。

Isolation performance of isolation bearing with initial rotation angle in double-layer cylindrical reticulated shell structure

In order to study the problem of bearing rotation in large span spatial structures, the horizontal seismic response analysis of double-layer cylindrical reticulated shell structure with rubber isolation bearing with initial rotation angle is carried out in the horizontal direction. The horizontal performance of the rubber isolation bearing was modified by combining the empirical formula obtained from the experiment, and the dynamic time-history analysis method was applied by SAP2000 to analyze the parameters of the rubber isolation bearing with the initial rotation angle considering the situation of the lower supporting structure. The results show that the peak shear force and peak acceleration at the bottom of the base isolation bearing with small corners will decrease under the action of horizontal earthquake. As the angle of rotation increases, the peak acceleration at the top of the column and the peak shear force at the bottom of the isolation bearing rapidly increase. However, the reticulated shell structure with large span height ratio will amplify the influence of the initial rotation angle on the structure, increase the peak acceleration of the whole structure and the peak displacement of the structural column, but limit the peak displacement of the upper reticulated shell structure. Therefore, when the initial rotation angle is considered, the amplification effect of the span-height ratio of the lattice structure should be taken into consideration when the acceleration or displacement of the lattice structure needs to be limited.