大跨CFST拱桥施工索力调整简便计算方法  

Simplified calculation method for long-span CFST arch bridge cable force adjustment

作　　者：吴月星 张劲泉[2,3] 周建庭[2] 王新忠[1] 徐智超 WU Yuexing;ZHANG Jinquan;ZHOU Jianting;WANG Xinzhong;XU Zhichao(School of Civil Engineering,Hunan City University,Yiyang,Hunan 413000,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074 [3]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2025年第3期182-194,共13页Journal of Highway and Transportation Research and Development

基　　金：湖南省自然科学基金项目(2024JJ7077);湖南省教育厅优秀青年项目(23B0732)。

摘　　要：【目标】提出了一种基于“未闭合配合力”思想的简便计算方法,旨在解决大跨钢管混凝土拱桥在斜拉扣挂法施工中索力调整复杂、拱肋线形控制难度大的技术难题。【方法】以一座主跨220 m的钢管混凝土拱桥为研究对象,借鉴斜拉桥施工索力计算方法,结合分阶段正装计算,对结构施工全过程的关键效应参数演化规律进行深入分析,并通过与传统计算方法的对比,验证新方法的可行性和优越性。【数据】研究表明,在施工过程中,通过控制塔偏、拱肋悬臂端竖向位移、封铰前铰点转角位移及合龙口无应力参数,施工完成后的拱桥松索成拱线形与目标值的最大误差仅为1.0 mm,符合规范要求,验证了计算方法的高精度。【结果】在拱脚封铰前阶段,调整铰点转角位移较调整拱肋悬臂端竖向位移的控制效果更为显著;在扣(背)索力调整过程中,无需对塔-索-拱耦合体系进行解耦,仅通过一次张拉即可实现拱桥施工全过程的最优控制目标。【结论】该简便计算方法显著简化了施工期索力调整过程,提高了施工效率,同时确保了拱桥线形的精确控制,具有计算精度高、操作性强、适用性广的优势。[Objective]Based on the concept of no-closure cooperating force,a simplified calculation method was proposed to address the technical challenges of complex cable force adjustments and the difficulty in controlling arch rib alignment during long-span CFST arch bridge construction by using the cable-stayed buckle method.[Method]Taking a CFST arch bridge with 220 m main-span as the study object,the cable force calculation method used in cable-stayed bridge construction was referenced.By integrating the staged forward calculations,the key effect parameters evolution rule throughout whole construction process was thoroughly analyzed.The comparative analysis with traditional methods was conducted to verify the feasibility and superiority of proposed method.[Data]During construction,the pylon deviation,arch rib cantilever-end vertical displacement,hinge point rotation displacement before hinge closure,and final closure unstressed parameters were controlled.The maximum alignment deviation between final arching alignment and target design was only 1.0 mm,fully meeting the specification requirements.[Result]Before the stage of hinge sealing at the arch foot,adjusting the hinge point rotation displacement demonstrates the superior control effectiveness compared with adjusting the cantilever-end vertical displacement of arch rib.During the buckle cable force adjustment process,the pylon-cable-arch coupling system decoupling is unnecessary.A single tensioning of buckle cables can achieve the whole-process optimization control for the arch bridge.[Conclusion]The proposed method can significantly simplify the cable force adjustment process during construction,enhance the construction efficiency,and ensure the precise control of arch rib alignment.It is with high calculation accuracy,strong operability,and broad applicability.

关 键 词：桥梁工程 线形控制 未闭合配合力 钢管混凝土拱桥 无应力参数 松索成拱 封铰 全过程最优 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]