【摘要】 大跨度斜拉桥拉索的风雨振现象越来越引起人们的重视,应用磁流变阻尼器进行拉索振动控制是一种新的探索。本文采用模态坐标表示的拉索运动方程和Bingham模型,对磁流变阻尼器-拉索系统的阻尼特性进行了全面仿真模拟,得到了阻尼器安装位置、外部激励大小及阻尼器输入电压等参数对系统前三阶模态阻尼比的影响规律,介绍了在洞庭湖大桥应用磁流变阻尼器进行拉索振动控制的试验研究情况,试验与仿真结果具有很好的一致性,表明仿真计算模型和方法是正确的和可行的。对磁流变阻尼器减振效果的仿真计算表明,该阻尼器具有很好的减振性能。在实际风雨振发生时实测的加速度响应进一步印证了仿真结果,表明应用磁流变阻尼器能很好地抑制拉索风雨振现象,磁流变阻尼器将是抑制拉索风雨振一种非常有效的手段。这些对于应用磁流变阻尼器进行拉索振动控制具有重要的指导意义。更多还原

【Abstract】 Phenomenon about wind-rain-induced vibration on cable-stayed bridges has attracted more attention worldwide in recent decade, and mitigating stay cables vibration by means of magneto-rheological (MR) damper is taken as a new exploration. In this paper, numerical simulations of a full-scale stay cable incorporated with MR damper are performed with Bingham model, and relationships of modal damping ratio versus attachment location of damper, ambient exciting force and voltage input to damper are acquired. A full-scale test of mitigating vibration using MR damper on Dongting Lake Bridge of Hunan province in China is reported, and test data are in good agreement with numerical results, indicating that the numerical model and the simulation method are reliable and effective. Mitigating vibration performance of MR damper is also simulated, and the results show that MR damper has a good mitigating effect. This has been verified by the acceleration responses measured when wind-rain induced vibration occurs. The present work will supply a guidance on the use of MR damper in cable-stayed bridges.更多还原