粘滞剪切型阻尼器试验及其拉索减振的工程应用

Test of viscous shear damper and application in cable damping engineering

为验证某新型粘滞剪切型阻尼器在斜拉桥拉索中的减振效果,对阻尼器进行了试验研究,得到了该阻尼器的力学性能。对装有该阻尼器某大型斜拉桥进行减震对比测试,得出斜拉索的对数衰减率面内为0.0639,面外为0.0607,大于0.03的规定值。建立了拉索减振仿真模型,显示减振效率有效值在19.99%以上,减振效果明显。研究表明利用粘滞剪切型阻尼器对桥梁拉索进行减振设计具有良好减振作用且更加经济,有较大的工程意义。当斜拉索振幅较小时,粘滞阻尼器实际应用减振效果与理论差别较大,仍需研究和完善。

To verify the damping effect of a new viscous shear damper in the cable of cable-stayed bridges,an study was performed to get the mechanical properties.To test a large cable-stayed bridge equipped with the damper,to have obtained the acceleration time-history attenuation curve and frequency spectrum comparison curve of the stayed cable.The logarithmic decay rate of stay cables is 0.0639 in plane and 0.0607 out of plane,which is greater than the specified value of 0.03.The simulation model of the stayed cable vibration reduction was established,and the results were obtained under pulsating wind results of cable vibration response.The effective value of vibration reduction efficiency is above 19.99%,and the vibration reduction effect is obvious.The research shows that the viscous shear damper has superior and stable vibration damping performance in the application of cable damping engineering,and further proves that the viscous damper vibration damping theory is correct.It is also found that when the amplitude of the stay cable is small,the application of the viscous damper in damping the engineering effect is quite different from the theory,which needs to be studied and improved.