黄土边坡框架预应力锚杆支挡结构的优化设计

Optimum design of grillage supporting structure with pre-stressed anchor bars on loess slope

在以前开展的有关框架预应力锚杆支挡结构的设计计算基础上,采用整体优化和局部优化相结合的方法对其进行了优化分析设计。文中以单位宽度内主要材料工程总造价为目标函数,以锚杆布置位置、构件截面尺寸、纵向钢筋和箍筋为设计变量,以现行规程的设计计算规定和构造要求为约束条件,建立了框架预应力锚杆支挡结构的优化设计数学模型,并采用复形法求优。实例计算证明,优化设计可获得造价最为经济的最佳设计方案。文中所采用的优化设计思想可为类似支挡结构的优化设计参考。

Based on the existing design and calculation about grillage supporting structure with pre-stressed anchor bars, the author applies the integral optimization and the local optimization for its optimization and analysis design. In this paper, by taking the unit project cost of main materials of unit length in the supporting structure as the objective function, the setting position of anchor bar, the section dimensions of members, bars and stirrups as the design variables ,and design and detailing requirements in the present code as the constraints,a optimum mathematical model about the grillage supporting structure with pre-stressed anchor bar is established. Then the complex method is adopted to search the optimum design. The numerical example shows that the proposed method can obtain the most economical optimal plan and this design approach may be used as reference for the similar supporting structure.