Monitoring and Mitigation of Stay-Cable Vibrations on the Fred Hartman and Veterans Memorial Bridges, Texas

2005 ◽  
Vol 11s ◽  
pp. 547-555 ◽  
Author(s):  
Keith Ramsey
Keyword(s):  
Stay Cable ◽  
Cable Vibrations

scholarly journals Full-Scale Measurements and System Identification on Sutong Cable-Stayed Bridge during Typhoon Fung-Wong

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Hao Wang ◽  
Tianyou Tao ◽  
Tong Guo ◽  
Jian Li ◽  
Aiqun Li
Keyword(s):  
Damping Ratio ◽  
Wind Tunnel Test ◽  
Full Scale ◽  
Structural Vibration ◽  
Stay Cable ◽  
Characteristic Analysis ◽  
Random Decrement Technique ◽  
Cable Stayed Bridge ◽  
Vibration Responses ◽  
Cable Vibrations

The structural health monitoring system (SHMS) provides an effective tool to conduct full-scale measurements on existing bridges for essential research on bridge wind engineering. In July 2008, Typhoon Fung-Wong lashed China and hit Sutong cable-stayed bridge (SCB) in China. During typhoon period, full-scale measurements were conducted to record the wind data and the structural vibration responses were collected by the SHMS installed on SCB. Based on the statistical method and the spectral analysis technique, the measured data are analyzed to obtain the typical parameters and characteristics. Furthermore, this paper analyzed the measured structural vibration responses and indicated the vibration characteristics of the stay cable and the deck, the relationship between structural vibrations and wind speed, the comparison of upstream and downstream cable vibrations, the effectiveness of cable dampers, and so forth. Considering the significance of damping ratio in vibration mitigation, the modal damping ratios of the SCB are identified based on the Hilbert-Huang transform (HHT) combined with the random decrement technique (RDT). The analysis results can be used to validate the current dynamic characteristic analysis methods, buffeting calculation methods, and wind tunnel test results of the long-span cable-stayed bridges.

Optimal Design of Dampers for Multi-Mode Cable Vibration Control Based on Genetic Algorithm

2021 ◽  
pp. 2150058
Author(s):  
Fangdian Di ◽  
Lin Chen ◽  
Limin Sun
Keyword(s):  
Genetic Algorithm ◽  
Vibration Control ◽  
Performance Optimization ◽  
Negative Stiffness ◽  
Stay Cable ◽  
Control Effect ◽  
Cable Vibration ◽  
Cable Vibrations ◽  
Damper Design ◽  
Multi Mode

Cables in cable-stayed bridges are subjected to the problem of multi-mode vibrations. Particularly, the first ten modes of long cables can have a frequency less than 3[Formula: see text]Hz and hence are vulnerable to wind-rain induced vibrations. In practice, mechanical dampers are widely used to mitigate such cable vibrations and thus they have to be designed to provide sufficient damping for all the concerned vibration modes. Meanwhile, the behaviors of practical dampers are complicated and better to be described by mechanical models with many parameters. Furthermore, additional mechanical components such as inerters and negative stiffness devices have been proposed to enhance the damper performance on cables. Therefore, it is increasingly difficult to optimize the damper parameters for suppressing multi-mode cable vibrations. To address this issue, this study proposes a novel damper design method based on the genetic algorithm (GA). The procedure of the method is first introduced where the damper performance optimization is formulated as a single-objective multi-parameter optimization problem. The effectiveness of the method is then verified by considering a viscous damper on a stay cable. Subsequently, the method is applied to optimize three typical dampers for cable vibration control, i.e. the positive stiffness damper, the negative stiffness damper, and the viscous inertial mass damper. The results show that the GA-based method is effective and efficient for cable damper design to achieve best multi-mode control effect and it is particularly useful for dampers with more parameters.

scholarly journals The use of Classical Rolling Pendulum Bearings (CRPB) for vibration control of stay-cables

2018 ◽  
Vol 148 ◽  
pp. 02002
Author(s):  
Georgia Papastergiou ◽  
Ioannis Raftoyiannis
Keyword(s):  
Suspension Bridges ◽  
Geometrical Parameters ◽  
Structural Elements ◽  
Stay Cable ◽  
Stay Cables ◽  
Taut String ◽  
Integral Differential Equations ◽  
Cable Vibrations ◽  
Cable Stayed Bridges

Cables are efficient structural elements that are used in cable-stayed bridges, suspension bridges and other cable structures. A significant problem which arose from the praxis is the cables’ rain-wind induced vibrations as these cables are subjected to environmental excitations. Rain-wind induced stay-cable vibrations may occur at different cable eigenfrequencies. Large amplitude Rain-Wind-Induced-Vibrations (RWIV) of stay cables are a challenging problem in the design of cable-stayed bridges. Several methods, including aerodynamic or structural means, have been investigated in order to control the vibrations of bridge’s stay-cables. The present research focuses on the effectiveness of a movable anchorage system with a Classical Rolling Pendulum Bearing (CRPB) device. An analytical model of cable-damper system is developed based on the taut string representation of the cable. The gathered integral-differential equations are solved through the use of the Lagrange transformation. . Finally, a case study with realistic geometrical parameters is also presented to establish the validity of the proposed system.

scholarly journals Observations of bridge stay cable vibrations in dry and wet conditions: A case study

2021 ◽  
pp. 116106
Author(s):  
Nicolò Daniotti ◽  
Jasna Bogunović Jakobsen ◽  
Jónas Snæbjörnsson ◽  
Etienne Cheynet ◽  
Jungao Wang
Keyword(s):  
Stay Cable ◽  
Dry And Wet Conditions ◽  
Cable Vibrations

scholarly journals GALLOPING INSTABILITY ANALYSIS OF A CABLE-DAMPER SYSTEM

2020 ◽  
Vol 30 (06) ◽  
Author(s):  
NGUYEN HUY CUNG ◽  
DO CAO PHAN
Keyword(s):  
Mode Shapes ◽  
Stay Cable ◽  
Aeroelastic Stability ◽  
Viscous Dampers ◽  
Instability Analysis ◽  
Numerical Example ◽  
Complex Modes ◽  
Cable Vibrations ◽  
Cable Stayed Bridges

Viscous dampers are used widely to mitigate cable vibrations cable-stayed bridges. A damper attached to a stay cable leads to complex modes. The complexity can highly affect the aeroelastic stability of the cable. A galloping instability analysis of cable with an attached damper will be presented. A numerical example points out errors of conventional galloping analysis. The complexity of the mode shapes leads the cable being more unstable than ignoring it by treating the mode shapes as real.

Mitigation of Wind-Rain-Induced Cable Vibration in Cable-Stayed Bridges: Energy Cost Assessment

2011 ◽  
Vol 105-107 ◽  
pp. 1165-1169
Author(s):  
Ling Yun Wang ◽  
Quan Feng Wang
Keyword(s):  
Energy Cost ◽  
Control Method ◽  
Control Technique ◽  
Stay Cable ◽  
External Energy ◽  
Design Guideline ◽  
Significant Control ◽  
Cable Vibrations ◽  
Control Forces ◽  
And Control

The cables in a cable-stayed bridge usually possess low inherent damping and are prone to vibrate by many factors. The wind-rain-induced vibration of the prototype stay cable is a special vibration problem associating with rain and wind. Many methods have been proposed to mitigate wind-rain-induced cable vibrations such as mechanical measures, aerodynamic modification, and control technology. Active control technique has significant control capability because of utilizing the external energy supply but it may not be realistic to large civil engineering structure due to enormous power demand. The two-stage control method has been proposed to control the wind-rain-induced cable vibrations of the prototype stay cable. The studies are carried out to investigate the energy cost features of the control forces as a design guideline.

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