千米级斜拉桥空间非线性合理恒载索力分析

Spatial Nonlinear Analysis of the Reasonable Cable Tension for a Thousand-meter Scale Cable-stayed Bridge Under Permanent Loads

建立了斜拉桥索力调整的空间非线性有限元分析模型 ,以斜拉桥主梁和索塔的弯曲应变能为目标函数、结构应力及索力为约束条件 ,采用一阶最优化计算方法进行求解 ,用以确定成桥合理状态的索力。应用该法分析了某千米级斜拉桥的合理成桥状态 ,计算结果表明 ,该方法简单、有效。

In this paper, a model for spatial nonlinear optimization programming to obtain the prestresses of cables in the cable-stayed bridge is established, in which the bending strain energy of the beams for the bridge and the cable tower is the objective function, and structural stresses and the cable forces are the constraint conditions. In order to determine the prestresses of the cables of the bridge, the first order optimization method is used to solve the program. This method is used to obtain set of optimal cable tensions of a thousand-meter scale cable-stayed bridge under permanent loads, and the result of analysis showed that the method is easy to apply and effective.