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由于钢丝集束体组成主缆的扭转刚度是受多因素影响的变量,目前空间主缆的扭转还没有可靠的计算方法。分析了影响空间主缆扭转刚度的主要因素,建立了主缆集束体考虑拉扭耦合效应的解析计算模型,推导了拉扭耦合引起的抗扭力矩的计算公式。在此基础上,讨论了主缆半径、主缆张力及扭转角对主缆扭转刚度的影响规律。从施工控制的角度分析了扭转刚度、索夹刚臂、吊索张拉次序及索夹预偏角对主缆扭转角的影响。研究结果表明:由于拉扭耦合效应的影响,在体系转换过程中随着主缆张力和扭转角的增大主缆扭转刚度呈明显的非线性增长;在施工控制中,为减小主缆的扭转变形,可在索夹安装时设置与成桥时索夹扭转方向相同的预偏角,利用吊索力通过索夹刚臂给主缆施加反向扭矩来实现对主缆扭转的主动控制,以抵消或减小主缆的扭转变形。
Since the torsional stiffness of the main cable composed of steel wire bundles is a variable affected by many factors, there is no reliable calculation method for the torsion of the main cable in the space at present. The main factors affecting the torsional stiffness of the main cable are analyzed. An analytical model considering the coupling effect of the torsion and torsion of the main cable is established, and the formula for calculating the torsional moment caused by the torsional-torsional coupling is deduced. On this basis, the influence of the main cable radius, main cable tension and torsion angle on the torsional stiffness of the main cable is discussed. From the perspective of construction control, the influences of torsional stiffness, rigid arm of cable clamp, sling tension order and cable pre-skew on the torsion angle of main cable are analyzed. The results show that due to the influence of the torsional-torsional coupling effect, the torsional stiffness of the main cable shows a significant nonlinear increase with the increase of the main cable tension and torsional angle during the system conversion. In the construction control, The torsional deformation can be set at the same pre-deflection angle when the cable clamp is installed as the cable clamp in the bridge when it is completed. The cable torque is applied to the main cable by the cable force to exert reverse torque on the main cable to realize the active control of the main cable twist, To offset or reduce the main cable torsional deformation.