Experimental Study on BFRPreinforced Predamaged Concrete BeamColumn Joints by Simulated Earthquake

Abstract:

A total of five repaired beamcolumn joints(BCJs) were predamaged under cyclic loads in order to study on the seismic behavior.The experimental study including predamage,rehabilitation and retest under cyclic loads concentrated on the effect on different levels of predamage and epoxy injection.Through the test data,namely the hysteresis curves,ductility,ultimate strength and stiffness degradation,etc,the following conclusion is drawn that the rehabilitation with basalt fiber sheets has notable influence on the seismic performance of joints,but ultimate loads limited.The repaired BCJs can reach or even exceed the level of their original seismic performance before predamage.The failure mode of strong beam and weak column is changed into strong column and weak beam after rehabilitations.The proper method is used in need for strengthening the damaged joints.

Key words:seismic damage; seismic performance; 3D beamcolumn joint; basalt fiber reinforced polymer; rehabilitation of damage