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为了分析岩溶区土的弹性模量对共同作用体系的影响,建立岩溶地基—桩筏基础—钢框架核心筒结构三维有限元模型,对比分析桩间土弹性模量变化时,上部结构的动力响应情况。结果表明:桩间土弹性模量的变化对共同作用体系的动力响应有一定的影响,随着桩间土弹性模量的增加,上部结构加速度峰值、位移峰值、层间位移角峰值整体上有减小的趋势,位移峰值变化率最大为12.76%,加速度峰值和层间位移角峰值变化率都在10%以内;基础的弯矩和剪力减小。分析其原因是桩间土弹性模量的增大,增大了地基的刚度,使地基土在地震作用下的变形减小,对桩筏基础的约束增大,从而使上部结构的动力响应和基础的内力减小。
In order to analyze the influence of elastic modulus of soil on the interaction system in karst area, a three-dimensional finite element model of karst foundation-piled raft foundation-steel frame core tube structure was established. When the elastic modulus of soil between piles changed, the dynamic response of superstructure Happening. The results show that the change of soil elastic modulus has some influence on the dynamic response of the interaction system. With the increase of elastic modulus of the pile, the acceleration peak, the displacement peak and the drift peak of the superstructure as a whole have The maximum rate of change of displacement peak is 12.76%, the peak change rate of acceleration peak and inter-layer displacement angle is within 10%, and the base moment and shear force decrease. The reason is that the elastic modulus of soil increases, the stiffness of foundation increases, the deformation of foundation soil decreases under the action of earthquake and the restraint of piled raft foundation increases, so that the dynamic response of the superstructure and Reduced internal forces.