Abstract:Cable vibration is a critical issue threatening the safety and serviceability of cable supported bridges. Dampers are often attached to cables for vibration control. Traditionally, the damper coefficients are regularly considered to be constant in cable-damper system analyses. However, existing theories and experiments show that dampers can behave differently when under forced displacements with varying frequency, which have not been investigated thoroughly for cable vibration control. Furthermore, for long cables, vibration control has to consider a number of cable modes, meaning that damper performance in a wide range of frequency is of interest. This study thus investigates frequency-dependent properties of cable dampers and their effects on multimode cable damping. The widely used viscous shear damper (VSD) is chosen for study. First, a VSD is manufactured and tested in laboratory under sinusoidal displacements with different frequencies. It is found that when the amplitude of the displacement is fixed, the stiffness of the damper increases with respect to frequency while the damping coefficient of the damper decreases along with frequency. The relations between the damper properties and the frequency can be described using exponential functions. Second, formulas for solving complex frequency of a shallow cable attached with a damper with intrinsic stiffness are derived. Third, the manufactured damper is attached to the real cable for field testing, and the measured damping ratios are found to be consistent with theoretical predictions considering the frequency-dependent cable properties. This study has demonstrated the importance of taking the frequency-dependent damper properties into account in cable damper design. The method based on laboratory testing of the damper and complex modal analysis of the cable-damper system is accurate and practical for practical design.
收稿日期: 2022-10-22
出版日期: 2022-05-28
引用本文:
孙利民1,2,孙浚杰1,陈林1. 黏性剪切阻尼器性能频率依存性对斜拉索索多模态阻尼影响研究[J]. 振动与冲击, 2022, 41(10): 124-132.
SUN Limin1,2,SUN Junjie1,CHEN Lin1. Theoretical and experimental studies on multimode cable damping effects provided by a viscous-shear damper with frequency-dependent properties. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(10): 124-132.
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