钢管混凝土拱桥斜拉扣挂施工的无应力状态控制法  

Unstressed state control method for cable-stayed construction of concretefilled steel tube arch bridges

作　　者：吴学伟 周倩 刘睿 杜春林 WU Xuewei;ZHOU Qian;LIU Rui;DU Chunlin(Hubei Communications Investment Group Co.,Ltd.,Wuhan 430050,China;Chongqing Jianzhu College,Chongqing 400072,China;Chongqing Housing and Urban Rural Construction Administrative Approval Service Center,Chongqing 400014,China;Chongqing Design Group Co.,Ltd.Municipal Design Research Institute branch company,Chongqing 401120,China)

机构地区：[1]湖北交通投资集团有限公司,湖北武汉430050 [2]重庆建筑工程职业学院,重庆400072 [3]重庆市住房和城乡建设行政审批服务中心,重庆400014 [4]重庆设计集团有限公司市政设计研究院分公司,重庆401120

出　　处：《长沙理工大学学报（自然科学版）》2024年第4期131-139,共9页Journal of Changsha University of Science & Technology:Natural Science

基　　金：重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0661);重庆市建设科技计划项目(城科字2023第1-10号);重庆市教委科学技术研究项目(KJQN202304301)。

摘　　要：【目的】避免钢管混凝土拱桥施工过程温度、临时荷载等因素变化对索力的影响,实现大跨拱桥拱肋斜拉扣挂节段拼装施工的精准高效调控。【方法】提出以扣索无应力长度代替索力调整拱桥过程状态的控制方法,推导考虑垂度效应和扣塔偏位的扣索无应力长度计算公式,研究索力增量与扣索无应力长度变化的关系。【结果】工程算例结果表明,基于无应力状态法的索力最大误差为5%左右,高程最大偏差3.7cm,计算精度满足要求,实现了精准高效的施工调控。【结论】该方法可消除温度和临时荷载变化对索力的影响,减小施工中间状态的计算工作量,可为大跨度钢管混凝土拱肋节段拼装提供技术支持。[Purposes]This article aims to avoid the influence of temperature,temporary loads,and other factors on the cable force during the construction process of concrete-filled steel tube arch bridges and achieve precise and efficient control of the large-span arch bridges constructed by assembling cable-stayed buckles and hanging segments.[Methods]A control method is proposed to adjust the process state of arch bridges by replacing the the cable force with the unstressed length of the cable.The calculation formula for the unstressed length of the cable considering the sag effect and the tower deviation is derived,and the relationship between the increment of the cable force and the change of the unstressed length of the cable is studied.[Findings]The engineering calculation results show that the maximum error of cable force based on the unstressed state method is about 5%,and the maximum elevation deviation is 3.7 cm.The calculation accuracy meets the requirements,achieving precise and efficient construction control.[Conclusions]This method can eliminate the influence of temperature and temporary load changes on cable force,reduce the calculation workload of intermediate state of construction,and provide technical support for the assembly of large-span concrete-filled steel tube arch rib segments.

关 键 词：钢管混凝土拱桥 无应力状态法 无应力长度 扣塔偏位 垂度效应 

分 类 号：U448.222[建筑科学—桥梁与隧道工程]