Suspension Bridge Cable Vibration Control Method Based on Tube Damper
Due to the problem of suspension bridge cable vibration,a tube damper vibration control method was proposed,aiming to reduce the cable amplitude,accelerate the vibration attenuation,prolong the cable life,and improve the bridge safety and durability performance.First,the motion characteristic equations of cable structure installed with tube damper were derived to determine the main parameters affecting vibration.The parameters were used as the control variables for subsequent analysis,comparison and screening.Second,the finite element model was established.The damping ratio was used as the vibration damping performance evaluation indicator to analyze the influence of each main parameter on cable-tube damper damping ratio by means of numerical simulation.Subsequently,the response surface method was adopted to realize the optimized vibration damping design with multi-parameter coupling.The interaction test analysis was carried out on the tube stiffness,mass ratio,rubber damping material,and cable-tube gap to obtain the optimal parameter combinations.Finally,the same excitation was applied to a single cable and a cable with tube damper under the assumption of fixed constraints at both ends to carry out the quantitative analysis.The variations of damping performance under different excitation loads were studied.Compare with the cable dynamic response after damper installation,so as to validate the rationality of design.The result indicates that the tube damper can effectively reduce the cable vibration displacement amplitude.When the cable is subjected to a specific frequency of external excitation load resonance,the tube damper will effectively avoid the resonance phenomenon caused by the occurrence of large displacement deformation phenomenon,reducing the structural fatigue damage risk.
bridge engineeringcable damperfinite element analysisvibration controlcable
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