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Full-scale test of dampers for stay cable vibration mitigation and improvement measures

  • Zhou, Haijun (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Xiang, Ning (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Huang, Xigui (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Sun, Limin (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Xing, Feng (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University) ;
  • Zhou, Rui (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University)
  • Received : 2018.02.10
  • Accepted : 2018.10.29
  • Published : 2018.12.25
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Abstract

This paper reported test of full-scale cables attached with four types of dampers: viscous damper, passive Magneto-Rheological (MR) damper, friction damper and High Damping Rubber (HDR) damper. The logarithmic decrements of the cable with attached dampers were calculated from free vibration time history. The efficiency ratios of the mean damping ratios of the tested four dampers to theoretical maximum damping ratio were derived, which was very important for practical damper design and parameter optimization. Non-ideal factors affecting damper performance were discussed based on the test results. The effects of concentrated mass and negative stiffness were discussed in detail and compared theoretically. Approximate formulations were derived and verified using numerical solutions. The critical values for non-dimensional concentrated mass coefficient and negative stiffness were identified. Efficiency ratios were approximately 0.6, 0.6, and 0.3 for the viscous damper, passive MR damper and HDR damper, respectively. The efficiency ratio for the friction damper was between 0-1.0. The effects of concentrated mass and negative stiffness on cable damping were positive as both could increase damping ratio; the concentrated mass was more effective than negative stiffness for higher vibration modes.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Ministry of Science and Technology

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