Based on the state-of-the-art about seismic damage principles and aseismic strengthening technology, analysis and design
method of seismic retrofitting for earthquake damaged reinforced concrete frame using magnetorheological (MR)
damper is proposed. Three levels of fortification objects are put forward and quantified or intelligent retrofitting of
reinforced concrete frame using MR damper. The experiment system of a three-floor reinforced concrete frame-shear
wall eccentric structure has been built based on Matlab/Simulink software environment and hardware/software resources
of dSPACE. The shaking table experiment of seismic retrofitting of earthquake damaged reinforced concrete frame-shear
wall structure using MR damper is implemented using rapid control prototyping (RCP) technology. The validity of
passive control strategies and semi-active control strategy is verified under El Centro earthquake excitations with
different peak value. The experimental results indicate that MR dampers can significantly enhance aseismic performance
level of the seismic damaged reinforced concrete frame, and meet all the earthquake fortification levels. The aseismic
ability of MR damper intelligent aseismic structure system of auto-reinforcement is much better than both the damaged
structure and the aseismic structure reinforced by the passive damper.
Magnetorheological (MR) damper is a kind of intelligent actuator, which shows immense potential in the field of structural vibration control. The construction and mechanical behavior of MR damper are introduced firstly, and then a new mechanical model--double sigmoid model is proposed based on the experimental study of MR damper. The simulation system of the 3-floor frame-shear wall eccentric structure with MR dampers was built according to the coupled translation and torsion response control using MR damper, based on Matlab/Simulink software environment and hardware/software resources of dSPACE. The shaking table experiment of the structural model was implemented by using rapid control prototyping (RCP) technology. The validity of two passive control strategies and one semi-active control strategy is verified under three input earthquake excitation with different peak value. The experimental results show that the coupled translation and torsion response is significantly mitigated, and the semi-active control strategies can achieve higher performance levels as compared to those of the two passive control cases. Moreover, the location of
the MR damper has an important effect on the control results.