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为了研究湿陷性黄土地区基础隔震结构不均匀沉降对其减震性能的影响情况,对比分析了不同区域沉降时对隔震层及上部结构造成的改变,并在此基础上通过动力时程分析计算了地震动作用下结构橡胶隔震支座和层间变形的响应。研究结果表明:不均匀沉降发生后,沉降区域及相邻区域支座的变形和内力均会出现较大变化,并使隔震层及上部结构的梁、柱内力重分布,造成部分构件隐性损伤甚至失效;对于发生不均匀沉降的基础隔震结构,地震作用会导致上部结构的层间位移产生不同程度的增大,进而导致上部结构提前进入下一个能力水平范围。
In order to study the influence of uneven settlement of base isolation structure on its shock absorption performance in collapsible loess area, the changes of isolation structure and superstructure caused by different areas during settlement are comparatively analyzed. Based on this, The response of the structural rubber bearing and the deformation between layers under earthquake action is analyzed and calculated. The results show that after the occurrence of uneven settlement, the deformation and internal forces of the abutment in the settlement area and the adjacent area will change greatly, and the beam and column internal forces in the isolation structure and superstructure are redistributed, resulting in the recession of some components Damage or even failure. For the base-isolated structure with uneven settlement, the seismic action will lead to varying degrees of interlayer displacement in the superstructure, leading to the advancement of the superstructure into the next level of capability.