Control of structures using magnetorheological fluid dampers and fiber-reinforced composite materials (earthquake resistance)

Supplemental energy-dissipating systems for bridge structures have been proposed to mitigate harmful effects of earthquakes. Controllable devices are among these systems and have attracted significant attention by researchers because they potentially provide immediate vibration control for structures subjected to destructive seismic motions.; In response to these demanding needs, a theoretical and experimental study is performed to evaluate the response of a scaled-model bridge using magnetorheological fluid (MRF) dampers. The scaled-model bridge is analyzed for its dynamic response to various inputs when MRF dampers are utilized to control the structure. Columns of different materials are also analyzed for their potential application in bridge structures fitted with these controllable devices.; Procedures and results for the theoretical and experimental testing of the MRF dampers and the scaled-model bridge are presented. MRF dampers proved to significantly improve the response of the scaled-model bridge by reducing the maximum displacement of the bridge relative to its supports.