银洲湖特大桥主梁优化设计分析  

Analysis on Optimization Design of Main Girder of Yinzhou Lake Bridge

作　　者：汤明 谢石 杨凯 段树坤 樊健生[2] 刘宇飞[2] TANG Ming;XIE Shi;YANG Kai;DUAN Shu-kun;FAN Jian-sheng;LIU Yu-fei(Power China Roadbridge Group Co.Ltd.,Beijing 100044,China;Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]中电建路桥集团有限公司,北京市100044 [2]清华大学土木工程安全与耐久教育部重点实验室,北京市100084

出　　处：《公路》2021年第11期126-132,共7页Highway

基　　金：国家自然科学基金项目,项目编号51725803。

摘　　要：混合梁斜拉桥的边跨混凝土梁多采用支架现浇,并在边跨设置多个辅助墩,辅助墩压重设计需求高。以银洲湖大桥为研究背景,将原设计"边跨少支架现浇+中跨单悬臂"施工方案优化为双悬臂施工方案,取消近塔侧辅助墩,并对混凝土箱梁进行构造优化,方便施工,提高了工程经济效益。采用有限元模型对比分析了优化前后桥梁结构受力状态,计算结果表明,优化后主梁受力状态与原设计相近,满足结构设计要求,主跨组合梁及主塔结构可维持原方案设计;取消近塔侧辅助墩可简化结构压重设计。In the side span of hybrid girder cable-stayed Bridges,concrete beams are usually cast-inplace with supports,and multiple auxiliary piers are set on the side spans,which makes the counterweight design of auxiliary piers difficult.The Yinzhou Lake Bridge is taken as the background of the study,the original construction design of cast-in-place with few supports at the side span and single-cantilever construction at the middle span is optimized into a double-cantilever construction design,the auxiliary pier near the tower is removed,and the structure of the concrete box girder is optimized,which is convenient for construction and improves the economic benefits of the project.The finite element model is used to compare and analyze the stress state of the bridge structure before and after optimization.The results show that the stress state of the main girder after optimization is similar to the original design and meets the structural design requirements.The main span composite beam and main tower structure can maintain the original design.The removal of the auxiliary pier near the tower can simplify the structural counterweight design.

关 键 词：斜拉桥 混合梁 施工方案 结构优化 有限元 

分 类 号：U442.52[建筑科学—桥梁与隧道工程]