Damping of Full-Scale Stay Cable with Viscous Damper: Experiment and Analysis

Zhou, Huidi; Sun, Lijun; Xing, Feng

doi:10.1260/1369-4332.17.2.265

Cited by 43 publications

(29 citation statements)

References 18 publications

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“…for instance, when τ = 0, the optimum damper design to suppress cable motion dominated respectively by modes i , j , or k is denoted in figure a by points i , j ′ , and k . this approach is similar to the common practice for optimizing conventional positive stiffness damper (psd) or zero stiffness damper (zsd) in controlling single‐mode cable vibration . in general, for the n th mode, this optimum design point can be determined by identifying the peak point on the y n − x curve, that is, dy n / dx = 0, where y n is given in equation .…”

Section: Formulation Of Nsd Design Approach To Suppress Multimode Cabmentioning

confidence: 99%

“…The utilization of energy‐dissipating devices, especially viscous dampers, has been a popular cable vibration control solution in the design of new cable‐stayed bridges and/or rehabilitation of existing ones . The amount of damping provided by a transverse viscous damper installed near the cable anchorage has been evaluated analytically, numerically, and experimentally . Practical design formula have been proposed to determine the damper size corresponding to the maximum achievable damping ratio .…”

Section: Introductionmentioning

confidence: 99%

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Multimode vibration control of stay cables using optimized negative stiffness damper

Javanbakht

Cheng

Ghrib

2020

Struct Control Health Monit

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Summary Due to their low inherent damping and high lateral flexibility, stay cables are prone to large amplitude vibrations governed by either a single or multiple cable modes. Among the practical measures, the installation of transverse passive dampers near the cable‐deck anchorage is a popular choice. Compared to conventional positive stiffness and zero stiffness dampers, negative stiffness damper (NSD) manifests superior performance in mitigating cable vibrations, especially in the case of long cables. In this study, a novel design approach is proposed to optimize NSD for multimode cable vibration control. Two design scenarios are considered. In the former, the damper size is optimized for a predetermined negative damper stiffness; whereas in the latter, the size and negative stiffness of the NSD are both optimized to achieve a required damping ratio for the dominant modes. The applicability of the proposed NSD optimum design approach is validated using 15 sample real stay cables. A numerical example is presented, of which a NSD is designed based on the proposed approach to optimize wind‐induced multimode vibration control of a 460‐m stay cable, and the performance is compared with that of a linear‐quadratic regulator (LQR) control. Results show that the selected NSD can effectively suppress the dominant modes and has a controlling effect comparable with an active control using LQR. In addition, it is found that when there exist more than two dominant modes in vibration, designing NSD for the lowest and the highest dominant modes would also adequately control the mid‐range modes.

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Section: Formulation Of Nsd Design Approach To Suppress Multimode Cabmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multimode vibration control of stay cables using optimized negative stiffness damper

Javanbakht

Cheng

Ghrib

2020

Struct Control Health Monit

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“…u r (t) (m/s) (being t the time variable (s)). The damping force generated by a viscous damper may be defined as follows [33,34]: Figure 1a shows the viscous damper-cable interaction model considered herein. The element COMBIN14 has been selected to simulate numerically the behavior of this damper.…”

Section: Numerical Modelling Of the Damper-cable Interaction Modelmentioning

confidence: 99%

Motion-Based Design of Passive Damping Devices to Mitigate Wind-Induced Vibrations in Stay Cables

et al. 2018

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Wind action can induce large amplitude vibrations in the stay cables of bridges. To reduce the vibration level of these structural elements, different types of passive damping devices are usually installed. In this paper, a motion-based design method is proposed and implemented in order to achieve the optimum design of different passive damping devices for stay cables under wind action. According to this method, the design problem is transformed into an optimization problem. Thus, its main aim is to minimize the different terms of a multi-objective function, considering as design variables the characteristic parameters of each considered passive damping device. The multi-objective function is defined in terms of the scaled characteristic parameters, one single-function for each parameter, and an additional function that checks the compliance of the considered design criterion. Genetic algorithms are considered as a global optimization method. Three passive damping devices have been studied herein: viscous, elastomeric and friction dampers. As a benchmark structure, the Alamillo bridge (Seville, Spain), is considered in order to validate the performance of the proposed method. Finally, the parameters of the damping devices designed according to this proposal are successfully compared with the results provided by a conventional design method.

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“…Main and Jones focused on small variation of the complex frequency and derived the same approximate solutions as that by Krenk; they also first discussed the damping and frequency of the cable–damper system when the damper is located at arbitrary location. Further, full‐scale cable test and studies showed the adverse effects of damper stiffness and damper supporter flexibility; the damper efficiency factor was proposed to considering these nonideal factors for easy of engineering application.…”

Section: Introductionmentioning

confidence: 99%

Free vibration of two taut cables interconnected by a damper

Zhou

Yao

et al. 2019

Struct Control Health Monit

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Summary Connecting cables together to form a cable net could mitigate cable vibration. However, because most of the studies and practices use secondary cables as cross‐ties, little attention has been paid on the connection by dampers. In this paper, a system of two parallel taut cables with an interconnected damper is proposed to mitigate cable vibration. The characteristic equation of the system is derived by applying the transfer matrix method. The analytical special limit solutions, which are corresponding to special kinds of vibration mode, are given for the case when the parameter of the system tends to specific limiting values. Analytical solutions to twin taut cable system, two taut cables with different mass–tension ratios, whereas other cable parameters are the same were also discussed. Parameter studies were further addressed to study effects of cable length ratio and frequency ratio on the third and fourth mode behaviors for two cables system. Different solution regimes with different kinds of modes are discussed as damper interconnected at arbitrary point of cables. Multimode damping optimization method was proposed with the concept of maximizing the average of damping ratio while minimizing the variation for the considered multimodes. The case study for two length cables of a harp system was carried out. It was found that connecting two cables with a properly designed damper could significantly increase multimode damping ratio while slightly increase vibration frequency.

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Damping of Full-Scale Stay Cable with Viscous Damper: Experiment and Analysis

Cited by 43 publications

References 18 publications

Multimode vibration control of stay cables using optimized negative stiffness damper

Multimode vibration control of stay cables using optimized negative stiffness damper

Motion-Based Design of Passive Damping Devices to Mitigate Wind-Induced Vibrations in Stay Cables

Free vibration of two taut cables interconnected by a damper

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