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建立了双塔楼大底盘土—结构动力相互作用的三维有限元分析模型,采用地震时程反应分析方法确定作用于多塔楼大底盘结构地下建筑的地震土压力。通过改变地下室周边框架结构的外挑跨数和塔楼间裙房部分的框架跨数,计算了不同地下室平面布置和刚度分布对地震土压力分布特征的影响。结果表明地下结构地震土压力在地表处具有最大值,且远大于其他埋深处的地震土压力数值,地下室外挑跨数和塔楼间裙房跨数对地下结构抗侧力刚度及地震土压力分布均有影响。最后,给出了一些结论和建议。
The three-dimensional finite element analysis model of soil-structure dynamic interaction of large chassis with two turrets was established. The seismic earth pressure acting on the underground structure of multi-tower large chassis structure was determined by seismic time-history analysis method. The influence of different basement floor layout and stiffness distribution on the distribution of seismic earth pressure was calculated by changing the number of external pick-up spans of the frame structure around the basement and the span of the podium part of the tower. The results show that the earth pressure of underground structure has the maximum value at the surface and much larger than the values of the earth pressure at other depths, the number of stubs in the underground and the span of the podium between towers, Distribution has an impact. Finally, some conclusions and suggestions are given.