矮塔斜拉桥塔高优化分析  

Analysis of Pylon Height Optimization for Dwarf Pylon Cable-stayed Bridge

作　　者：刘文会[1] 李雁[1] 田鹏[1] 李腾飞[1] 

机构地区：[1]吉林建筑工程学院,吉林长春130021

出　　处：《公路交通科技》2009年第10期82-86,共5页Journal of Highway and Transportation Research and Development

基　　金：吉林建筑工程学院博士基金资助项目

摘　　要：通过大型通用有限元分析软件Midas/Civil建立模型,在索力影响矩阵的基础上,以斜拉索初张力为目标,建立矮塔斜拉桥塔高优化模型,分析了塔高变化对主梁内力产生的影响,并对兰州小西湖黄河大桥塔高进行了优化计算分析。结果表明,在不增加斜拉索总面积和基本不改变配索量的前提下,通过合理调整斜拉索的初张力可以达到优化塔高的目的,其优化效果非常明显。矮塔斜拉桥的塔高降低且斜拉索初张力采用优化值后,全梁的挠度图、弯矩图更平顺,可以改善矮塔斜拉桥主梁的受力性能。对于PC矮塔斜拉桥而言,塔跨比在0.08～0.125之间,结构整体受力合理,在0.11时,斜拉索在其容许应力范围内利用率最高。Aimed at the target function of stay-cable initial tension and based on cable force influencing matrix, an optimal model of pylon height of dwarf pylon cable-stayed bridge was built by using finite element analysis software Midas/Civil. The influence of pylon height change on the interior force in main beam was analyzed, and the optimal pylon height of Lanzhou Xiaoxihu Yellow River Bridge was calculated. The result indicates that （1） the pylon height can be optimized through reasonable adjustment of the cable initial tension without increasing the total area of stay cables and keeping the cable matching basically and the optimization effect is obvious; （2） the beam＇s deflection diagram and bending moment diagram are more smooth and the main beam＇ s stress performance can be improved after reducing the pylon height and adopting the optimized cable initial tension; （3） the overall structural stress of PC dwarf pylon cable-stayed bridge is reasonable when the pylon height-span ratio H/L equals 0.08 -0. 125; （4） the rate of cable utilization reaches the highest in its range of allowable stress when H/L equals 0.11.

关 键 词：桥梁工程 优化 影响矩阵 塔高 矮塔斜拉桥 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]