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筏板基础的受力性能较为复杂,同时学术界对筏基的探究相对缺乏,使得在实践过程中针对筏板的计算理论和分析方法并不全面和可靠.采用断开式分析方法的筏板基础造价费用相对较高,建筑材料浪费较大.为了探究上部建筑结构和基础共同作用,运用有限元设计程序对框剪结构-筏板基础-地基共同作用体系创建了三维有限元分析模型,比较分析了两种状态下上部结构轴力和弯矩的变化以及基础沉降.结果表明,考虑共同作用能够让筏板的差异沉降得以减小,上部结构的轴力和弯矩产生了重分布.同时,因建筑结构上部刚度的作用,筏板内力降低,钢筋使用量也相对减少.
The mechanical behavior of raft foundation is more complex, and the relative lack of research on raft in academia makes the calculation theory and analysis method for raft in practice not comprehensive and reliable.The raft In order to explore the interaction between the superstructure and the foundation, a three-dimensional finite element analysis model was established for the frame-shear structure-raft foundation-foundation interaction system by using the finite element programming procedure, comparing with the comparatively high cost of basic construction and the waste of construction materials. The change of the axial force and moment and the settlement of the foundation under two states are analyzed.The results show that the differential settlement of the raft can be reduced by considering the interaction and the axial force and bending moment of the superstructure are redistributed, , Due to the rigidity of the upper part of the building structure, the internal force of the raft is reduced and the amount of steel used is relatively reduced.