大跨度上承式梁拱结合刚构桥合理成桥状态设计方法  

Design Method for Reasonable Bridge Formation State of Long-span Upper Bearing Girder-arch Combined Rigid-frame Bridge

作　　者：闫福成 赖亚平 乔云强 陈培新 YAN Fucheng;LAI Yaping;QIAO Yunqiang;CHEN Peixin(T.Y.Lin International Engineering Consulting(China)Co.,Ltd.,Chongqing 401121)

机构地区：[1]林同棪国际工程咨询(中国)有限公司,重庆401121

出　　处：《公路交通技术》2025年第2期62-69,共8页Technology of Highway and Transport

基　　金：重庆市技术创新与应用示范项目(CSTC2018jscx-mszd0430)。

摘　　要：为寻求大跨度上承式梁拱结合刚构桥最优合理成桥状态,基于该桥型结构组成、结构参数、力学特征及施工方法等方面的研究,提出5点关键指标控制迭代法用于合理成桥状态设计。该方法选取了大跨度上承式梁拱结合刚构桥的墩梁固结点、拱梁固结点、主跨跨中点、拱墩固结点、主墩墩底点为5个关键控制点,以关键强度、刚度及线形参数为评价指标并拟定目标限值,通过桥梁设计边界条件为不变量,拟定可变量以及可变量的初值、步长和终值,采用有限元数值模拟手段进行施工阶段正装迭代分析求解合理成桥状态,得到可变量最优解。该方法在重庆礼嘉嘉陵江大桥的工程案例中进行了成功应用,丰富了上承式梁拱结合刚构桥合理成桥目标状态理论研究,为该桥型合理成桥状态的良好控制提供了方法论。To find the optimal rational bridge state for long-span upper girder-arch combined rigid-frame bridge,based on the research of the structure composition,structural parameters,mechanical characteristics and construction methods of the bridge,the 5-point index control iteration method is proposed for the rational bridge state design.The method selects pier-girder consolidation node,arch-girder confluence node,main span mid-span node,arch-pier combination node and main pier bottom node as five key control points of long-span upper girder-arch combined rigid-frame bridge,uses key strength,stiffness and linear shape parameters as evaluation index and formulates target limits,uses bridge design boundary conditions as invariant,and formulates variable and variable initial,step and final values.By means of numerical simulation of finite element,the optimal solution of the variable is obtained by iterative analysis of the forward loading as a rational bridge state solution.The method has been applied and practiced in the engineering case of Lijia Jialing river bridge in Chongqing,which enriches the theoretical study of the rational bridge state of the upper girder-arch combined rigid-frame bridge,and provides a reference for control of the rational bridge state of similar bridges.

关 键 词：梁拱结合 合理成桥状态 关键控制点 关键参数 评价指标 目标状态 双层临时斜拉扣挂法 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]