摘要
针对洞庭湖铁路斜拉桥的结构特点,提出先箱后桁两步拼装的新方法,并对该法提出2个施工方案并进行有限元模拟和对比分析,定量研究箱、桁由于施工不同步引起的变形不协调问题。根据计算结果推荐方案2,该方案能将箱、桁变形的不协调控制在螺栓与螺栓孔间隙的可调范围内,而且可以在桥面上多点分段拼装主桁杆件以加快施工进度。该方案已被成功应用于该桥的施工并取得了很好的效果。
According to the structure characteristics of Dongting Lake railway cable-stayed bridge,a new method of two-step construction was proposed,in which the box girder was fabricated first and then the steel trusses were installed on the box girder deck.This method not only overcomes the shortages of separate installation,such as too many components and too heavy aerial work on the site,but also overcomes the shortcomings of segment installation such as large size and large weight of the segment,too many splice joints,and difficulties of installation,hoisting and transfer of the segment.Two plans of the new method were presented,and their construction processes were simulated.The nonconforming deformation of the box girder and the truss bars were studied quantitatively using finite element method.According to the results,plan 2 was recommended,which can control the nonconforming deformation of the box girder and the truss bars within the adjustable range of the gap between the bolt and the bolt hole.Furthermore,the installation of the truss bars upon the box girder can be divided into many parts along the length of the bridge.In these parts,the truss bars can be installed at the same time to speed up the construction process.Plan 2 has been recommended and successfully used in the construction of the bridge and obtained excellent results.
作者
张晔芝
杨毅
易伦雄
ZHANG Yezhi;YANG Yi;YI Lunxiong(School of Civil Engineering,Central South University,Changsha 410075,China;China Zhongtie Major Bridge Reconnaissance&Design Institute Co.,Ltd,Wuhan 430050,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第10期2557-2564,共8页
Journal of Railway Science and Engineering
基金
中国铁路总公司科技研究开发计划项目(2013G001-B)
关键词
三塔铁路斜拉桥
箱.桁组合结构
先箱后桁两步拼装法
箱、桁变形不协调
有限元
triple-tower railway cable-stayed bridge
box-truss composite structure
two step construction method of installing box girder first and then installing trusses
nonconforming deformation of box girder and steel truss
finite element
