基于最优化理论的特大跨悬臂浇筑拱桥施工阶段拱圈节段浇筑长度分析  

Length Analysis of Sectional Casting of Extra Large Cantilever Casting Arch Bridge Based on Optimization Theory

作　　者：郑浪 田仲初 张祖军 ZHENG Lang;TIAN Zhongchu;ZHANG Zujun(Hunan Communications Vocational and Technical College,Changsha,Hunan 410004,China;Changsha University of Science and Technology,School of Civil Engineering,Changsha,Hunan 410015,China)

机构地区：[1]湖南交通职业技术学院,湖南长沙410004 [2]长沙理工大学土木工程学院,湖南长沙410015

出　　处：《公路工程》2020年第4期36-40,共5页Highway Engineering

基　　金：国家重点基础研究计划(九七三计划)项目(2015CB057701);国家自然科学基金项目(51478049)。

摘　　要：基于最优化理论,以某拱桥悬臂浇筑节段长度为优化目标,建立了优化数学模型,并通过有限元软件ANSYS得到了最优数值解。计算结果表明:拱圈节段浇筑长度变化对索力峰值有较大影响,优化后索力最大增幅40.8%;同时,优化节段浇筑长度可有效降低施工过程中截面拉应力峰值,最大降幅15.34%,成拱后拱圈应力线更逼近于"一次成拱"状态。Based on the optimization theory, this paper establishes an optimization mathematical model based on the length of the cantilever casting section of an arch bridge, and obtains the optimal numerical solution through the finite element software ANSYS. The calculation results show that the change of the length of the arch ring section has a great influence on the peak of the cable force. The maximum cable strength after optimization is 40.8%. At the same time, optimizing the length of the section casting can effectively reduce the peak tensile stress during the construction process, the maximum drop is 15.34. %, the stress line of the arch ring after arching is closer to the "one arching" state.

关 键 词：最优化理论 悬臂浇筑节段长度 索力峰值 截面拉应力 一次成拱 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]