高层结构考虑土与地下室相互作用的振动台试验和理论分析

采用振动台试验研究了土与地下室相互作用对带多层地下室高层错位转换结构地震反应的影响。在7度小震阶段对比研究了其地下室周围有土及砂等介质约束和无约束情况下的动力特性和动力反应。在7度中震及大震阶段,土与地下室相互碰撞现象被发现。采用有限元方法非线性模拟了土与地下室相互碰撞对高层结构反应的影响。试验及分析表明,水平地震作用下土与地下室相互碰撞会对高层结构,特别是在±0.000附近部位产生不利反应,大震作用下并能造成一定程度的破坏。

Shaking table test and FEM analysis for interaction between soil and basement of a high-rise building

A high-rise building with multistory basement and stagger transfer structure is tested on a shaking table.At the stage of minor earthquake of intensity 7,the dynamic characteristic and response of high story structure with soil-sand around the basement is compared with that without soil-sand around the basement.At the stage of moderate and major earthquake of intensity 7,the pounding phenomenon between the soil and the basement is found.The method of nonlinear FEM is adapted.The pounding between the soil and the basement is considered.The FEM analysis result and test research show that the pounding between the soil and the basement will cause disadvantage effects on the dynamic response of the high-rise building,especially near the elevation 0.000,and it will cause damage at the stage of major earthquake.