摩擦型阻尼器的斜拉索减振试验研究

通过人工激振后测自由振动衰减，得到了拉索一摩擦型阻尼器系统的对数衰减率．试验结果表明，安装摩擦型阻尼器后拉索阻尼有了很大的提高；试验测得的对数衰减率值与拉索的最大振幅及模态均相关；实测所得到的对数衰减率一振幅及模态关系和Main提出的理论计算结果，在拉索所能获得的对数衰减率最大值及对数衰减率值随振幅及模态的变化趋势相吻合，然而在振幅的幅值对应上存在较大的差异；对于非线性较强的摩擦型阻尼器，Main提出的理论仍需进行修正方能在阻尼器优化设计中应用．

A Full-Scale Experimental Study on Cable Vibration Mitigation with Friction Damper

A full-scale free vibration test of stay cable with attached friction damper near cable anchorage was carried out. The logarithmic decrement of the cable-damper system was measured. Experiment results show that the logarithmic decrement of the cable-damper system can be greatly increased when compared to the free cable. The measured logarithmic decrement varies with cable vibration mode number and amplitude. The maximum attainable logarithmic decrement measured from the experiment is the same as the analytical result; and the changing trend of logarithmic decrement with am- plitude and mode number of cable vibration is also consistent with the analytical results. On the other hand, the frequency difference was also found between the experimental results and the analytical results, which indicates that the analytical method proposed by wain should be revised for optimum design of strongly nonlinear damper, such as the friction damper.