悬吊支架法施工钢混组合梁的力学行为研究  

Study on Mechanical Behavior of Steel-concrete Composite Girders Constructed by Suspension Bracing Method

作　　者：管弦 唐国华 GUAN Xuan;TANG Guo-hua(Beijing Huahong Engineering Consultants Co.,Ltd.,Beijing 101101,China;Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]北京华宏工程咨询有限公司,北京101101 [2]重庆交通大学,重庆400074

出　　处：《公路交通科技》2022年第10期84-90,共7页Journal of Highway and Transportation Research and Development

摘　　要：通过三维有限元模型采用悬吊支架法进行了钢混组合梁施工过程的仿真模拟,分析了悬吊支架自重、风荷载、悬吊点纵向间距、混凝土桥面板厚度、桥面混凝土浇注过程及悬吊支架拆除等多因素对钢主梁及其组合梁力学性能的影响,揭示了钢混组合梁在悬吊支架法施工过程中的力学行为。结果表明:钢主梁的正应力和位移均随着悬吊支架的重量增加而增加且对增幅影响都相对较大;施工过程中的风荷载会对钢主梁产生较大的横向位移,应在荷载组合分析中考虑横风荷载且采取必要措施来限制桥面板浇注过程中钢主梁的横向位移;钢主梁的位移和应力会随着悬吊点的纵向距离的变化而呈现出抛物线形变化,故悬吊点纵向距离的最佳取值推荐为4 m;钢主梁的跨中最大位移和应力值随着桥面板板厚的增大而增大,且桥面板的质量在整个系统受力中占据了主要的地位;悬吊支架法浇注桥面板过程中钢主梁的应力和变形都随着桥面板混凝土施工阶段的进行而增加,为确保桥梁的各阶段线形和理论相符,应在施工过程中根据在每个浇注阶段施工后引起的钢主梁竖向位移变形对各个截面的设计标高进行预抬高。另外,钢混组合梁预拱度设置时必须充分考虑由于悬吊支架拆除而引起的钢主梁向上回弹因素。The construction process of steel-concrete composite girders is simulated by using 3 D finite element model and suspension bracing method. The influences of multiple factors such as self-weight of suspension bracket, wind load, longitudinal spacing of suspension points, concrete deck slab thickness, concrete casting process and suspension bracket removal on the mechanical properties of the main steel girder and the composite girder are analyzed. The mechanical behavior of the steel-concrete composite girders during the construction process by suspension bracing method is revealed. The result shows that(1) The normal stress and displacement of the steel girder increase with the increase of the weight of the suspension bracket and they have relatively large impact on the increase.(2) The wind load during construction process will produce large transverse displacement of the main steel girder, the transverse wind load should be considered in the load combination analysis and necessary measures should be taken to limit the transverse displacement of the main steel girder during the deck casting process.(3) The displacement and stress of the main steel girder will show a parabolic change with the change of the longitudinal spacing of the suspension points, so the optimal value of the longitudinal spacing of the suspension points is recommended to be 4 m.(4) The maximum mid-span displacement and stress of the main steel girder increase with the increase of the deck slab thickness, and the weight of the deck slab occupies the main position in the whole system force.(5) In the process of casting deck slabs with the suspension bracing method, the stress and deformation of the main steel girder increase with the concrete construction stage of the deck slabs. In order to ensure that the geometric shape of the bridge at each stage is consistent with the theory result, the design elevation of each section should be pre-raised during the construction process according to the vertical displacement and deformation of the main st

关 键 词：桥梁工程 悬吊支架 钢混组合梁 力学行为 有限元分析 

分 类 号：U445.46[建筑科学—桥梁与隧道工程]