Base isolation of small low-rise buildings using fiber reinforced elastomeric bearings

This paper presents a novel base isolation system which is intended for cost effective seismic mitigation of small low-rise buildings. The proposed base isolation system utilizes Fiber Reinforced Elastomeric Isolator (FREI) bearings in an unbonded application. Experimental studies indicate that the unbounded application adds to the efficiency of the FREI bearings, as seismic isolators, due to Stable Rollover (SR) deformation. The experimentally evaluated lateral load-displacement properties of the FREI bearings were modelled using a multi parameter mathematical model. Results from a time history analysis performed on a 2-storey prototype base isolated as well as a corresponding fixed-base masonry building suggest there is a significant potential for the proposed base isolation technique to be effectively used in hazard mitigation of low-rise buildings located in high seismic regions such as Vancouver, BC.