Research on Cable Vibration Control Using Negative Stiffness Dampers with Flexible Supports
Cable-stayed bridges is a common form of large-span bridges,with stayed cables playing a crucial role as load-bearing components.However,these cables often suffer vibration issues.Negative stiffness dampers exhibit excellent energy dissipation capabilities,providing a novel option for cable vibration mitigation.As the length of the cables increases,the required support height also increases,potentially introducing some flexibility.Firstly,based on an actual cable-stayed bridge,a numerical model of the support-negative stiffness damper system is established and validated through model experiments.A numerical model of the cable control system is then developed.Subsequently,considering the flexibility of the support,the method for determining the design parameters of the control scheme is investigated,and numerical simulations are conducted to identify additional modal damping ratios.The research findings indicate a good agreement between the established numerical model of the support-negative stiffness damper system and experimental results,allowing for accurate predictions of the system's mechanical behavior.The use of flexible support enables the adoption of smaller damping coefficients and negative stiffness levels,achieving equivalent vibration reduction effects and thus facilitating an economically efficient design of negative stiffness dampers.
bridge engineeringstayed cablesnegative stiffnessdampersflexible supportvibration control
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