Abstract: There were some defects in the optimization algorithm , when ANSYS software was applied in the optimization of initial cable forces of cable-stayed bridges under dead loads. Based on the condition mentioned above , a new optimization method of initial cable forces of cable-stayed bridges , which combined MATLAB with ANSYS , was proposed. Genetic algorithm in MATLAB optimization toolbox was used as the main optimization program to make ANSYS carry out the optimization calculation , which could improve the defects of ANSYS in the optimization of initial cable forces of cable-stayed bridges under dead loads. Eventually , the proposed method was applied to the optimization of initial cable forces of one cable-stayed bridge. Comparing the results with those of ANSYS first-order optimization method , the results show that the proposed method is effective and practical.

Key words: cable-stayed bridge, cable force adjustment, penalty function method, genetic algorithm

摘要： 针对应用ANSYS进行斜拉桥恒载索力优化时，其优化算法所存在的不足，提出了一种MATLAB联合ANSYS 斜拉桥恒载索力优化方法。将MATLAB优化工具箱中的遗传算法作为主要优化程序调用ANSYS进行索力优化计 算，以改进ANSYS在斜拉桥恒载索力优化中的不足;应用此优化方法对一个密索斜拉桥算例进行恒载索力优化。 与ANSYS1阶优化结果相对比，该方法更有效、更实用。

关键词: 斜拉桥, 索力调整, 惩罚函数, 遗传算法