多点支撑转体斜拉桥转动牵引力影响因素试验研究

Experimental Study on Influence Factors of Rotational Traction Force of Multi-Point Supported Rotating Cable-Stayed Bridge

为研究多点支撑转体斜拉桥转动牵引力的影响因素,以实际项目为工程背景,设计制作缩尺比为1∶10的转体模型,测试承力支腿结构形式、承力支腿数量、转体速度、轨道不平顺四个影响因素对转动牵引力的影响。研究结果表明:采用单独橡胶垫结构形式时,牵引力波动幅度相对较小,梁体转动更为平稳,牵引力更容易控制;减少承力支腿数量后,各驱动装置扭矩波动幅度增大,桥梁转体稳定性明显降低;转动速度增大一定程度上放大了轨道不平顺、齿轮咬合等问题,牵引力波动幅值显著增大;轨道不平顺度越大,牵引力波动幅度越明显,桥梁转体稳定性越差。

To investigate the influence factors of rotational traction of multi-point supported rotating cable-stayed bridge, this paper designs and makes a rotating model with a scale of 1∶10 against the actual project background, and tests the influence of four influencing factors on rotational traction: structural form of supporting legs, number of supporting legs, rotating speed and track irregularity. The results show that the fluctuation range of traction force is relatively small, the bridge rotation is relatively more stable, and the traction force is easier to control when using the structure of rubber pad alone. When the number of supporting legs is reduced, the torque fluctuation of each driving device will increase, and the stability of bridge rotation will decrease obviously. With the increase of rotation speed, the problems of track irregularity and gear bite are magnified to a certain extent, and the amplitude of traction fluctuation increases significantly. The greater the track irregularity is, the more obvious the traction fluctuation is and the worse the bridge stability is.