上部结构、梁板式矩形筏基和地基共同作用解析分析

ANALYTICAL ANALYSIS OF INTERACTION OF SUPERSTRUCTURE-STIFFENED AND RECTANGULAR RAFT-SOIL

将弹性地基上的梁板式矩形筏基视为十字交叉梁与平板组合体系,上部结构刚度简化为等效刚度板,采用半数值、半解析方法,通过梁、板、柱以及地基之间力与位移平衡协调分析,可得到考虑上部结构刚度时梁板式筏基与地基共同作用的半数值、半解析解。该方法收敛性较好,未知量少,便于实际应用。算例结果表明,上部结构刚度对梁板式筏基的变形和内力影响显著。工程实例表明,该方法具有较好的适应性,特别是对于常规的岩土工程勘察资料,可采用插值的方法进行地基沉降系数计算。

Considering the stiffened plate as a composite system of grillage beams and slab, the superstructure as an equivalent rigidity plate, a semi-analytical and semi-numerical method, which makes use of compatible analysis of force and displacement among beams and slabs and columns and ground, is developed to analyze interaction between stiffened raft foundation and subsoil considering the rigidity of superstructure. The method has good preciseness and less unknown variables and it is convenient to be used in practice. Numerical examples and practical engineering case both show that superstructure rigidity has an important influence on deformation and interal force of stiffened raft foundation and practical engineering proves that the presented method has good preciseness and practicality. Especially, it is convenient to calculate the coefficient of subsoil settlement with the data of geotechnical engineering investigation.