Strengthening of R.C. Beam Column Joint Under Seismic Loads Using of Recent Material

ABSTRACT Significant researches have been devoted to develop different techniques to enhance the seismic resistance of the column joints (e.g. Traditional R.C. jackets, rectangular steel jackets, etc…).This research study was conducted to investigate the possibility of using new materials technology (e.g. Slurry Infiltrated Fiber Reinforced Concrete SIFCON), for seismic retrofitting of nonductile R. Concrete frame column joints, under simulated seismic loads. To accomplish this study, eight -large scale- column joints have been tested to examine the effectiveness of using various types of jacketing to improve the ductility and strength of this non-ductile column joints. Column joint response was examined before and after being strengthened by jacketing. The behavior of non-ductile reinforced concrete column joints was monitored under large cyclic inelastic loadings before and after retrofitting. This research indicate that the use of SIFCON jackets for retrofitting column joints improve its capacity, energy dissipation capacity and its ductility for resisting seismic loads.