Structural control of seismically induced pounding of elevatedbridges by using magnetorheological dampers

摘要

Pounding at the expansion joints or between the adjacent members of the long,rnmulti-span, concrete highway bridges is one of the important sources that affect the safety of thernbridges under modern to strong earthquake excitations. In this paper, Finite element model of anrnelevated bridge is established and analyzed considering the pounding effect by simulating thernpounding with contact element. The structural control problem by using magnetorheologicalrn(MR) dampers to eliminate the pounding effects is also conducted in this study. Semiactive controlrnstrategy is designed and used to manipulate the actuators. The simulation results show thatrnthe semiactive control system by using MR dampers can effectively reduce the structural responsesrnif the control system is appropriately designed.