基于粒子群优化算法的独塔斜拉桥成桥索力优化  

Optimization of Stay Cable Tension of Completed Bridge of Single-Pylon Cable-Stayed Bridge Based on Particle Swarm Optimization Algorithm

作　　者：陈志军[1] 刘洋[1] 杨立飞[1] 张晟斌[2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430057

出　　处：《桥梁建设》2016年第3期40-44,共5页Bridge Construction

基　　金：贵州省交通厅科技项目(2015-122-051)~~

摘　　要：为使独塔斜拉桥受力合理均匀,满足合理成桥状态,采用粒子群优化算法联合有限元软件ANSYS进行独塔斜拉桥成桥索力优化。利用MATLAB平台作为主控程序,调用ANSYS软件建立空间有限元模型进行结构分析,根据计算结果构建目标函数,并通过罚函数法将其转化为适用于粒子群优化算法(PSO)的无约束优化问题,利用PSO算法寻找无约束目标函数的全局最优适应度值,以求解独塔斜拉桥最优成桥索力值。结果表明,优化后主梁竖向位移和弯矩明显减小,主梁线形更加合理,主梁弯矩图更加平顺,索力分布更加均匀。To make the structural forces of the single-pylon cable-stayed bridge reasonable,well-distributed and meet the requirements of the reasonable completed bridge state,the combined way of the particle swarm optimization（PSO）algorithm and the finite element software ANSYS was used to optimize the stay cable tension of the completed bridge of the bridge.The MATLAB platform was taken as the master control program,the ANSYS was called to establish the spatial finite element model and the structural analysis was carried out.In accordance with the calculations,the objective function was created and by the penalty function method,the function was converted to the unconstrained optimization issue that could adapt to the PSO algorithm.The PSO algorithm was then used to find the global optimal adaptation degree value of the unconstrained objective function so that the optimal stay cable tension value of the single-pylon cable-stayed bridge could be solved.The results show that after the optimization of the stay cable tension of the completed bridge,the vertical displacement and bending moment of the main girder are significantly reduced,the geometric shapes of the girder are more reasonable,the bending moment of the girder is smoother and the stay cable tension is more well-distributed.

关 键 词：独塔斜拉桥 索力优化 粒子群优化算法 有限元法 目标函数 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] TU311.4[交通运输工程—道路与铁道工程]