Application of smart passive damping system using MR damper to highway bridge structure |
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Authors: | Kang-Min Choi Hyung-Jo Jung Sang-Won Cho In-Won Lee |
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Affiliation: | (1) Korea Advanced Institute of Science and Technology, Daejeon, Korea;(2) The University of Western Ontario, London, ON, Canada |
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Abstract: | Magnetorheological (i.e., MR) dampers are one of the most prospective semiactive control devices for civil engineering applications
to earthquake hazard mitigation, because they have many advantages such as small power requirement, reliability, and low price
to manufacture. A smart passive system based on an MR damper system without including a power supply, controller, and sensors
consists of an MR damper and an electromagnetic induction (i.e., EMI) system that uses a permanent magnet and a coil. The
electromotive force induced by movement of a structure can control MR damper effectively without any external power supply
and control algorithm. This smart passive control system is implemented to verify the effectiveness for seismic protection
of benchmark structural control problem for the seismically excited highway bridge, which is based on the newly constructed
91/5 highway over-crossing in Southern California. The results of the numerical simulations show that the presented control
system can be beneficial in reducing seismic responses of benchmark bridge structure. |
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Keywords: | Magnetorheological damper Smart passive damping |
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