[연구논문-방재] Performance Evaluation of Linear Active Mass Damper for Bridges through Wind Tunnel Test

In this paper, a linear active mass damper is proposed and developed to reduce vibration of long-span bridges subjected to wind loads. The system was designed and built for a scaled bridge deck model. Laser sensors measure the dynamic response of the bridge deck model subjected to wind loads, and the linear active mass dampers control vibration in the vertical direction and rotation using the measured data. Linear Quadratic Gaussian (LQG) algorithm determines the controlling force of the dampers using the collected bridge deck response data. Wind tunnel tests were carried out to evaluate the performance of the linear active mass damper system. Test variables consisted of the natural frequency of the bridge deck, moving mass of the linear active mass damper, effective damping ratio of the damper, number of dampers activated, and wind load condition. Test results showed that the linear active mass damper system was able to control wind-induced torsional rotation and vertical displacement with high efficiency.