%0 Journal Article %T 双塔单跨悬索桥空间主缆扭转性能数值分析<br>Numerical analysis of torsional property about spatial cable of twin towers single span suspension bridge %A 李游 %A 李传习 %A 曹水东 %A 曾宇环 %A 高辰 %J 北京交通大学学报 %D 2018 %R 10.11860/j.issn.1673-0291.2018.04.004 %X 摘要 针对空间缆索悬索桥体系转换过程中主缆发生扭转，而扭转刚度为多因素影响的变量，数值模拟中难以准确考虑，从而无法精确计算主缆扭转角及确定索夹预偏角的难题，以杭州江东大桥为工程背景，揭示了吊索张拉过程中主缆的扭转机理，从理论上分析了钢丝层间摩擦力对主缆扭转刚度的影响，并将拉-扭耦合效应及钢丝层间摩擦力在数值模拟中加以考虑，有效提高了计算精度，并通过改变抗扭刚度系数、吊杆张拉力、索夹预偏角等参数，确定主缆扭转特性与扭转效应，揭示了其正反扭原理.研究结果表明：体系转换过程中主缆扭转变化历程在数值模拟中需通过非线性迭代实现；随吊杆张力增大，主缆抗扭刚度从最小值逐步增加，改变主缆的抗扭刚度系数对主缆最终扭转角的影响不大；改变某索夹横向预偏角，主缆扭转现象存在“弱相干性原理”和“相邻影响原理”；索夹预偏角小于（或大于）吊杆力与铅垂线夹角，主缆将跟随索夹发生正向（或反向）扭转，当吊杆力方向通过主缆形心时，扭转角不再改变.<br>Abstract：The main cable will be twisted during construction of space cable suspension bridges. The torsional stiffness is a variable affected by many factors, so it is difficult to accurately consider the torsional stiffness in numerical simulation. Therefore, it is impossible to accurately calculate the torsion angle of the main cable and determine the pre-deflected angle of the cable clamp. Hangzhou Jiangdong Bridge is taken as the engineering background, the torsion mechanism of the main cable is revealed during tensioning process of hanger, and the influence of the friction between steel layers on the torsional stiffness of the main cable is analyzed, and the tension-torsion coupling effect and the friction between the steel wires are considered in the numerical simulation, which effectively improves the calculation accuracy. The torsion characteristics and effects of the main cable are studied by changing the torsional rigidity coefficient, the hanger force and the pre-deflected angle of cable clamp. The torsion principal of the positive and reverse direction of the main cable section is revealed. The research results show that the torsional change course of the main cable in the process of system conversion needs to be achieved through nonlinear iteration in numerical simulation. With the increase of the hanger force, the torsional rigidity of the main cable increases gradually from the minimum value. Changing the torsional stiffness coefficient of the main cable has little effect on the final twist angle of the main cable. If the lateral pre-deflected angle of a cable clamp is changed, the twisting of the main cable has the phenomenon of "weak coherence principle" and "adjacent influence principle". When the pre-deflected angle of the cable clamp is less than (or greater than) the angle between the hanger force and the vertical line, the cable clamp will drive the main cable cross-section to torsion in the positive (or reverse) direction. when the direction of hanger force passes through the center of main cable, the twist angle of main cable no longer be changed. %K 空间主缆 %K 扭转刚度 %K 数值模拟 %K 索夹横向预偏角 %K 扭转效应< %K br> %K spatial cable %K torsional rigidity %K numerical simulation %K horizontal pre-deflected angle of cable clamp %K torsion effect %U http://jdxb.bjtu.edu.cn/CN/abstract/abstract3395.shtml