This paper presents vibration control of a scaled two-span bridge structure. Magneto-rheological fluid (MRF) dampers are utilized as the semi-active energy absorbing devices and a bridge vibration control system is developed. Closed-loop control system based on the total energy minimization is used to suppress the bridge deck motion under simple harmonic and simulated earthquake excitation. It is experimentally demonstrated that this closed-loop control system can effectively control the relative displacement and the absolute acceleration of the bridge deck.

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