摘要
为解决钢绞线斜拉索无应力长度缺失带来的施工控制难题,提高大跨度斜拉桥施工控制的高效性,将单根索内钢绞线视为整体,基于无应力状态基本原理,根据拉索张拉前结构状态与拉索目标无应力长度,提出了求解斜拉桥合理施工阶段索力的索长迭代法,并基于北盘江大桥实际施工流程,分别采用索长迭代法和索力控制法进行了正装分析。结果表明:在实际施工流程计算中,索长迭代法可很好地自适应施工工序和临时荷载的改变,通过索长迭代法得到的标高、索力与目标状态的最大差值分别为20.3mm、25.2kN,状态差值均较小且随着悬臂长度的增加状态差值最终都得以收敛;而采用索力控制时,成桥状态的偏差均较大,与目标线形、索力的最大差值达到了523.9mm、380.7kN,体现了索长迭代的实用性、优越性。
In order to solve the problem of construction control precision caused by the absence of non-stress length of strand stay cable,make construction control efficient in long-span cable-stayed bridges,treat the strands in single cable as whole,based on the basic principle of zero-stress length,according to the actual state of structure before cable tensioning and the target zero-stress length of cable,the cable-length-iteration method for solving cable force in reasonable construction stage in cable-stayed bridges is proposed,then based on the actual construction process in Beipan River Bridge,using cable-length-iterative method and cable-force-control method for forward analysis respectively.The results show that in the analysis of the actual construction process,cable-length-iterative method can be well adapted to construction process and temporary load changes,the maximum difference in elevation and cable force between the calculated state and the target state is 20.3 mm and 25.2 kN respectively,the state difference is small and it is finally converged with cantilever length increasing.On the other hand,there is a great difference between the completion state and the target state while using cable-force-control method,the maximum difference in elevation and cable force between the calculated state and the target state reaches 523.9 mm and 380.7 kN respectively,the practicality and superiority of cable-length-iterative method is reflected.
作者
王晟
宁平华
颜东煌
潘权
WANG Sheng;NING Pinghua;YAN Donghuang;PAN Quan(Guangzhou Municipal Engineering Design and Research Institute Co.,Ltd.,Guangzhou,Guangdong 510060,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,Guangdong 510641,China;School of Civil Engineering,Changsha University of Science & Technology,Changsha,Hunan 410114,China)
出处
《公路工程》
北大核心
2019年第3期6-10,32,共6页
Highway Engineering
基金
国家973项目(2015CB057706)
国家自科基金项目(51178059,51678068)
广州市政总院研究课题(KY-2017-023)
关键词
桥梁工程
斜拉桥
合理施工阶段
索长迭代
施工控制
bridge engineering
cable-stayed bridge
rational construction state
cable-length-iteration method
construction control
