Abstract

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.

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