Abstract
As an essential component of offshore bridges, stay cables are prone to vibrations due to their low inherent damping characteristics. Various dampers have been used for cable vibration control; however, the experimental research and theoretical study of inertial dampers on real cables have not been conducted sufficiently. This study aims to investigate the damping performance of a novel viscous inertial damper (VID) and focuses on the frequency-dependent and displacement amplification phenomena of a cable-damper system. Tests were first conducted to verify the energy consumption capacity of a prototype damper. A shallow cable-VID system was established. Theoretically, complex-valued modes were analyzed to determine the influence of the inertial and viscous coefficients on the cable’s frequency and mode damping ratio. The test results and numerical analysis show that the VID has a good damping effect on the shallow cable. Considering multiple adjacent cable modes, the inertial and viscous coefficients can be optimized. After optimizing, the VID can simultaneously maximize both adjacent symmetric and antisymmetric modes’ damping ratios. The two frequencies are almost the same. The displacement amplification of the VID shows that a VID can overcome the shortcomings of displacement loss caused by traditional oil dampers. The implications of these findings of the VID on shallow cable are discussed, which will guide future research and applications of the VID or other inerter dampers.
Highlights
As an essential component of the offshore cable-stayed bridge, cables have high flexibility and low inherent damping
E rotation of the damping disc in the damping fluid plays the role of shearing the fluid, since the disc has certain inertia. It plays a role in providing negative stiffness
We conducted normalized complex-valued modes analysis and experimental research on a novel viscous inertial damper. e numerical and experimental results agree well, demonstrating the accuracy of the proposed method for cable vibration control. e mechanical properties of the cable-VID system were analyzed in detail. e main conclusions of this study are summarized as follows: (1) e novel viscous inertial damper constructed in this study can effectively suppress cable vibration, improve the cable’s mode damping ratio, and more quickly attenuate cable vibration
Summary
As an essential component of the offshore cable-stayed bridge, cables have high flexibility and low inherent damping. E additional external viscous damper can directly increase the cable’s mode damping ratio, which is the most common cable vibration control method. Passive viscous dampers solve the vibration problem of cables to some extent, but the installation location restricts the damper’s damping effect. E installation location does not exceed 5% of the cable length [17, 18], so the additional damping ratio provided may be limited. Parameters such as the sag, bending stiffness, damper support stiffness, internal stiffness, and the coupled vibration between the cable and the beam will reduce the damping effect [15, 19]. Many factors dramatically limit the viscous damper’s damping effect
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