桩筏基础的系统模拟法优化设计研究

System simulation method for optimum design of piled rafts

针对桩筏基础复杂的大系统问题,提出了系统模拟法优化设计思想。首先应用正交试验设计优化系统输入,其次采用桩筏基础有限元分析程序计算系统输出响应,最后运用多目标决策技术优化系统输出响应并确定桩筏基础优化设计均衡解。该方法实现了人机交互的优化设计,可确保优化结果可行性。

An optimal design method combining the system simulation technology and the multi-object decision technology, which can be used for optimum design of piled rafts, is presented. The objective function for the optimization is defined as the volume of materials of piled rafts, while the variables are raft thickness, pile length, pile spacing and pile location. First using orthogonal test to optimize system input scheme, then applying 3DFEM to calculate system output, at last the multi-object decision technology is adopted to evaluate output and acquire optimal solution. The validity and effectiveness of the proposed method is examined by a numerical example.