Earthquakes and Structures

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H-TMD with hybrid control method for vibration control of long span cable-stayed bridge

  • Han, Bing (School of Civil Engineering, Beijing Jiaotong University) ;
  • Yan, Wu Tong (School of Civil Engineering, Beijing Jiaotong University) ;
  • Cu, Viet Hung (School of Civil Engineering, Beijing Jiaotong University) ;
  • Zhu, Li (School of Civil Engineering, Beijing Jiaotong University) ;
  • Xie, Hui Bing (School of Civil Engineering, Beijing Jiaotong University)
  • Received : 2017.10.10
  • Accepted : 2019.02.09
  • Published : 2019.03.25
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Abstract

Long span cable-stayed bridges are extremely vulnerable to dynamic excitations such as which caused by traffic load, wind and earthquake. Studies on cable-stayed bridge vibration control have been keenly interested by researchers and engineers in design new bridges and assessing in-service bridges. In this paper, a novel Hybrid-Tuned Mass Damper (H-TMD) is proposed and a hybrid control model named Mixed Logic Dynamic (MLD) is employed to build the bridge-H-TMD system to mitigate the vibrations. Firstly, the fundamental theory and modeling process of MLD model is introduced. After that, a new state switching design of the H-TMD and state space equations for different states are proposed to control the bridge vibrations. As the state switching designation presented, the H-TMDs can applied active force to bridge only if the structural responses are beyond the limited thresholds, otherwise, the vibrations can be reduced by passive components of dampers without active control forces provided. A new MLD model including both passive and active control states is built based on the MLD model theory and the state switching design of H-TMD. Then, the case study is presented to demonstrate the proposed methodology. In the case study, the control scheme with H-TMDs is applied for a long span cable-stayed bridge, and the MLD model is established and simulated with earthquake excitation. The simulation results reveal that the suggested method has a well damping effect and the established system can be switched between different control states as design excellently. Finally, the energy consumptions of H-TMD schemes are compared with that of Active Tuned Mass Damper (ATMD) schemes under variable seismic wave excitations. The compared results show that the proposed H-TMD can save energy than ATMD.

Keywords

Acknowledgement

Supported by : Transport Ministry in China, China National Natural Science Foundation

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