不规则平面桩-筏基础优化的一种简化方法

A simplified method for optimization of foundation with irregular planar pile raft

基于桩 筏基础荷载传递的局部化特性 ,提出了一种简化分析方法 ,即采用悬臂梁比拟筏板与柱周围各桩之间的联系 ,进行桩顶沉降计算 ,再用差分法计算筏板弯矩 .建立了同时考虑桩的弹性支承性质和桩间土参与共同工作的不规则桩 筏基础优化设计数学模型 ,并采用变容差主动约束可行方向法对一实际工程进行优化设计 .

A simplified analysis method based on that the transmission of the load in pile raft foundation is characterized by a sort of its localization. In this method, the connection between the raft slabs and the piles around the column is simulated by a cantilever beam to calculate the settlement of the pile top and, further, the bending moment of the raft slabs with finite difference method. A mathematical model of optimization design of the irregular pile raft foundation is established by considering simulta neously both the elastic supporting of the pile and the contribution of the soil around the pile. A pile raft foundation for an actual engineering project is optimized by using feasible direction method defined by active constraints with variable tolerance.