Author(s): MA Yong-quan, QIU Hong-xing, QI Yong-cheng, College of Civil Engineering, Southeast University
Pages: 887-891
Year: 2015 Issue:  6
Journal: Journal of Northeastern University(Natural Science)
Keyword:  vibration control; highway bridge; magnetorheological fluid; inverse model; force feedback;
Abstract: To effectively suppress the oversize displacement of both grider and bearing on seismically isolated bridges after an earthquake,a newsemi-active control strategy based on the force-feedback( FF) fit for magneto rheological dampers( MRD) was proposed. First,the semiactive control strategy taking the restoring force provided by seismic isolation devices as the main feedback signal was proposed. Then,the current criteria which were applied to help the damping force produced by MRD approximate to the desired control force were proposed. Finally,the semi-active closed-loop control system based on the force-feedback was designed. The various evaluation criteria of tri-span seimicically isolated continuous grider bridges with Passive-off control,Passive-on control, FF control and clipped optimal( CO) control were computed respectively. The results indicated that the control effects on girder displacement, bearing displacement and base shear under the FF control are more significant than those of Passive-on control,Passive-off control and CO control.