矮塔斜拉桥斜拉索设计参数优化分析  

Optimization Analysis of Design Parameters of Cable-stayed Bridges with Low Pylon

作　　者：农升伟 NONG Shengwei(Guangxi Zhuang Autonomous Region West Guangxi Highway Development Center,Nanning,Guangxi 530007,China)

机构地区：[1]广西壮族自治区桂西公路发展中心,广西南宁530007

出　　处：《黑龙江交通科技》2024年第6期88-91,共4页Communications Science and Technology Heilongjiang

摘　　要：为分析矮塔斜拉桥的受力性能,以太原河汾大跨度矮塔斜拉桥为工程案例,针对斜拉索设计参数,选择斜拉索面积,斜拉索间距以及无索区长度作为分析参数,分别选取受力性能最差的斜拉索应力、主梁跨中挠度以及主梁截面最不利应力三个指标作为目标函数,定义结构综合目标函数W。根据正交试验方法的参数分析,确定了矮塔斜拉桥斜拉索最优参数组合,同时采用极差分析法对结构综合目标W进行分析,获得斜拉索设计参数对矮塔斜拉桥受力性能的敏感性及显著性。结果表明,矮塔斜拉桥斜拉索设计参数最优组合为:斜拉索面积为原设计的1.2倍、斜拉索间距4.0 m、无索区长度30 m,较原设计方案主梁应力减小了9.9%,主梁挠度减小了3.0%,斜拉索应力减小了7.4%;综合结构主要力学指标来看,参数敏感性程度由强到弱依次为斜拉索间距、斜拉索面积以及无索区长度。In order to analyze the mechanical performance of a long-span cable-stayed bridge,the Taiyuan Hefen large-span cable-stayed bridge was taken as an engineering case.According to the design parameters of the cable-stayed cable,the area of the cable-stayed cable,the distance between the cable-stayed cable and the length of the cable-free zone were selected as the analysis parameters,and the three indexes of the cable-stayed cable stress with the worst mechanical performance,the mid-span deflection of the main beam and the most unfavorable stress of the main beam section were selected as the objective function.Define the structure synthesis objective function W.According to the parameter analysis of orthogonal test method,the optimal parameter combination of the cable-stayed bridge is determined.Meanwhile,the comprehensive objective W of the structure is analyzed by using range analysis and variance analysis,and the sensitivity and significance of the design parameters of the cable-stayed bridge on the mechanical performance of the cable-stayed bridge are obtained.The results show that the optimal combination of cable-stayed bridge design parameters is as follows:the area of the cable-stayed cable is 1.2 times of the original design,the distance of the cable-stayed cable is 4.0 m,and the length of the cable-free zone is 30 m.Compared with the original design scheme,the stress of the main beam is reduced by 9.9%,the deflection of the main beam is reduced by 3.0%,and the stress of the cable is reduced by 7.4%.According to the mechanical index of the structure,the sensitivity degree of the parameters is the distance of the cable,the area of the cable and the length of the cable-free zone in order from strong to weak.

关 键 词：矮塔斜拉桥 斜拉索 正交试验 参数优化分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]