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Control of a Seismically Excited Cable-Stayed Bridge Employing a Hybrid Control Strategy

  • 박규식 (한국과학기술원 건설 및 환경공학과) ;
  • 정형조 (한국과학기술원 건설 및 환경공학) ;
  • 이종헌 (경일대학교 토목공학) ;
  • 이인원 (한국과학기술원 건설 및 토목공학과)
  • 발행 : 2002.10.01

초록

This paper presents a hybrid control strategy for seismic protection of a benchmark cable-stayed bridge, which is provided as a testbed structure for the development of strategies for the control of cable-stayed bridges. In this study, a hybrid control system is composed of a passive control system to reduce the earthquake-induced forces in the structure and an active control system to further reduce the bridge responses, especially deck displacements. Lead rubber bearings and ideal hydraulic actuators are used fur the passive and active control systems. Bouc-Wen model is used to simulate the nonlinear behavior of lead rubber bearings and an H₂/LQG control algorithm is adopted as an active control algorithm. Numerical simulation results show that the performance of the proposed hybrid control strategy is superior to that of the passive control strategy and slightly better than that of the active control strategy. The proposed control method is also more reliable than the fully active control method due to the passive control part. Therefore, the proposed hybrid control strategy can effectively be used to seismically excited cable-stayed bridges.

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