桩筏基础-差异上部结构相互作用的特征

竖向荷载相差较大的上部结构与筏板基础及桩土之间涉及复杂的相互作用问题.依据子结构法,通过将差异上部结构刚度矩阵和荷载向量向筏板基础顶面的凝聚,分析筏板基础子结构的平衡条件和桩-土支承体系内部的相互作用特征,建立了桩筏基础-差异上部结构相互作用的分析方法.以位于桩筏基础之上的某15层框剪结构体系为算例,进行了桩筏基础-差异上部结构相互作用特征的有限元分析,揭示了满堂均匀布桩条件下,筏板基底反力和沉降的分布特征,以及差异上部结构和筏板基础共同参与调整基底不均匀沉降过程中,荷载与内力的转移规律.

Behavior of interaction between piled raft foundation and structure with different vertical load

There is a complex interaction between piles-soil-raft foundation-structure with different vertical load.Condensating the stiffness matrix and the load vector of the structure with different vertical load onto the roof of the raft foundation,analyzing the equilibrium condition of the raft foundation and the behavior on the interaction in the pile-soil system,analysis method is established about the interaction between the piled raft foundation and structure with different vertical load by substructure method.A numerical example of fifteen-story frame-shear structure with different vertical load on the piled raft foundation is given.The result shows preliminarily the distributed behavior of contact pressure and settlement along the bottom of the piled raft foundation,as well as the transfer regularity of the load and internal force of the structure and the raft foundation in the process of their regulating the uneven settlement of the bottom along the foundation.