Experimental Study on the Fire Endurance of Post-installed Rebar Connection System

Abstract

Post-installed rebar connection system (PIRCS) is being increasing used in rehabilitating and retrofitting. Since the fire exposure is one of the most severe risks in the service life of PIRCS, it is of significance to understand the behavior of PIRCS under fire. In this paper, a theoretical method was developed to predict the fire endurance of PIRCS. As the preliminary study, pull-out tests were undertaken to figure out the bond-slip behavior of post-installed rebar at elevated temperatures. To verify the proposed method, 6 specimens reinforced with post-installed rebars were tested under the ISO 834 fire with constant loads. The parametric studies were carried out on the thickness of concrete cover and embedment length. The proposed method is proved to be acceptable in accuracy and applicable in evaluating the fire endurance of PIRCS for design purposes