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Damping and frequency of twin-cables with a cross-link and a viscous damper

  • Zhou, H.J. (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Yang, X. (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Peng, Y.R. (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Zhou, R. (Institute of Urban Smart Transportation & Safety Maintenance, Shenzhen University) ;
  • Sun, L.M. (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Xing, F. (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University)
  • Received : 2018.08.25
  • Accepted : 2019.01.25
  • Published : 2019.06.25

Abstract

Vibration mitigation of cables or hangers is one of the crucial problems for cable supported bridges. Previous research focused on the behaviors of cable with dampers or crossties, which could help engineering community apply these mitigation devices more efficiently. However, less studies are available for hybrid applied cross-ties and dampers, especially lack of both analytical and experimental verifications. This paper studied damping and frequency of two parallel identical cables with a connection cross-tie and an attached damper. The characteristic equation of system was derived based on transfer matrix method. The complex characteristic equation was numerically solved to find the solutions. Effects of non-dimensional spring stiffness and location on the maximum cable damping, the corresponding optimum damper constant and the corresponding frequency of lower vibration mode were further addressed. System with twin small-scale cables with a cross-link and a viscous damper were tested. The damping and frequency from the test were very close to the analytical ones. The two branches of solutions: in-phase modes and the out-of-phase modes, were identified; and the two branches of solutions were different for damping and frequency behaviors.

Acknowledgement

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

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