期刊论文

中文

公路工程

1674-0610

2019

44

3

6-10,32

10.19782/j.cnki.1674-0610.2019.03.002

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).

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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. 3 mm、25. 2 kN,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...

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,us...