悬索桥钢丝绳空间主缆扭转性能试验  

Experimental on torsion performance of spatial main cables of wire rope in suspension bridges

作　　者：李传习[1] 李游[1] 高辰 曾宇环 吴湛 叶龙祥 LI Chuan-xi;LI You;GAO Chen;ZENG Yu-huan;WU Zhan;YE Long-xiang(Key Laboratory of Safety Control for Bridge Engineering of the Ministry of Education,Changsha University of Science&Technology,Changsha 410114,Hunan,China)

机构地区：[1]长沙理工大学桥梁工程安全控制教育部重点实验室

出　　处：《长安大学学报（自然科学版）》2019年第6期67-77,共11页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51778069,51708047,51378080);桥梁工程安全控制教育部重点实验室开放基金项目(16BCX12);国家重点基础研究发展计划(“九七三”计划)项目(2015CB057701,2015CB057702);广东省交通运输厅科技项目(201602010);湖南省研究生科研创新项目(CX20190635)

摘　　要：针对空间主缆自锚式悬索桥体系转换过程中主缆易产生扭转、错位、鼓丝等问题,以杭州江东大桥为研究背景,采用钢丝绳主缆替换平行钢丝主缆,进行几何缩尺比为1∶15的模型试验,设计二合一多功能索夹、吊索张拉锚固系统、主缆锚固装置、吊杆力测试装置、缆索位形测量装置等,进行不同形式索夹、不同吊索索夹预偏角、不同吊杆张拉力的模型试验,研究了钢丝绳空间主缆截面的扭转性能。研究结果表明:设计的二合一多功能索夹与张拉锚固系统能方便地实现不同形式索夹、不同吊索索夹预偏角、不同吊杆张拉力的模型试验;给索夹设置准确的初始预偏角可有效减小体系转换过程中主缆的扭转角;当吊杆横桥向倾角相同时,所有索夹固定为0°且均可自由转动情况下,主缆各测点的扭转角相差很小,绕主缆自由转动形式的索夹对主缆扭转角改善并不明显;当索夹均未设置初始横向预偏角时,随吊杆横向桥倾角的增大,主缆扭转角逐渐增大。与平行钢丝主缆相比,钢丝绳主缆在吊杆张拉过程中产生的扭转角更小,在空间悬索桥中扭转性能更好,适用性更强;主缆产生横向变形过程中也会发生扭转,这与弯桥的弯扭耦合类似,吊索力偏心仅引起局部扭矩,由主缆整体横向变形导致的扭转角有待进一步研究。Aimed at the problem that the spatial main cable of self-anchored suspension bridge will be torsion,misalignment,drums and so on in the process of system conversion.The Hangzhou Jiangdong Bridge was taken as the research background,the main cable of the steel wire rope was used instead of the main cable of the parallel steel wire,and a model test was conducted with a geometric scale ratio of 1∶15.The two-in-one multi-functional cable clamps,hanger tensioning and anchoring systems,main cable anchoring devices,hanger force testing devices,and cable position measuring devices were designed.The model tests of different types of cable clamps,different pre-deflected angles of cable clamps and hangers,and different tensioning forces of the hangers were carried out.The characteristics and effects of torsion of the wire rope space main cable section were studied,the local torsion mechanism of the spatial main cable and the influence of various parameters on the torsion angle of the main cable were effectively reveals.The results show that the designed two-in-one multi-functional cable clamp and tensioning and anchoring system can easily achieve the model tests of different types of cable clamps,different pre-deflected angles of cable clamps and hangers,and different tensioning forces of the hangers.The accurate initial pre-deflected angle for the cable clamp can effectively reduce the twist angle of the main cable in the system conversion process.If the inclination of the cross-boom direction of the hanger is the same,the twist angles of the measurement points of the main cable have a small difference when all the cable clamps are fixed at 0 degrees,and all the cable clamps can be freely installed.When the initial lateral pre-deflection angle is not set in the cable clamp,the torsion angle of the main cable gradually increases as the inclination angle of the transverse bridge of the hanger increases.Compared with the parallel cable main cable,the twisted angle generated by the main cable of the steel wire rope is smalle

关 键 词：桥梁工程 空间主缆 全桥模型试验 钢丝绳主缆 索夹横向预偏角 扭转性能 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]