Abstract
Stay cables are one of the vital components of a cable-stayed bridge. Due to their flexible nature, stay cables are vulnerable to external excitation and often vibrate with large amplitude under wind action which leads to the fatigue failure of the cables. To suppress such kind of large amplitude vibration by improving the damping ratio of the cable various dampers such as magnetorheological damper, friction damper; oil damper; or high damping rubber (HDR) damper are utilized and gained popularity over time. This paper focuses on improving the damping ratio of stay cables using a combination of two HDR dampers. First, the theoretical model is formulated considering cable bending stiffness to evaluate the damping effect of cable-HDR dampers system. Then, the impact of various design parameters of HDR dampers on cable damping considering the cable stiffness is performed. The comparative analysis of results shows that the considered parameters such as loss factor, spring factor, and installation location of dampers have much effect on the stay cables damping ratio. Finally, the optimal parameters of the two HDR dampers are proposed for damper design.
Highlights
Stay cables have low mass, low frequencies, and low damping ratio, so they are vulnerable to external excitation
Y., and Nam H. [7] proposed the formulas for calculating the cable damping ratios of stay cable with a single high damping rubber (HDR)-damper
The modal damping ratios do not depend much on the vibration modes for the stay cable installed HDR damper without rotational constraint at cable ends [7,10]
Summary
Stay cables have low mass, low frequencies, and low damping ratio, so they are vulnerable to external excitation. [7] proposed the formulas for calculating the cable damping ratios of stay cable with a single HDR-damper. It is difficult to obtain an expected damping level using a single damper for very long-stay cables [4] In this regard, the use of two dampers at different locations can provide a possible countermeasure to suppress the cable vibration by increasing the total damping [10]. The model for estimating the cable damping ratio of two HDR dampers considering the cable bending stiffness has been not studied yet and their effect is not fully understood. The theoretical model is proposed to evaluate damping effect of the cable with two HDR dampers considering its bending stiffness. An optimization study for two HDR dampers is carried out and discussed in detail
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