LOCAL BOND STRESS-SLIP BEHAVIOR OF REINFORCING BARS EMBEDDED IN PLAINAND FIBER CONCRETE

This study summarizes the results of an experimental investigation of the bond and slip characteristics of reinforcing bars embedded in fibe r reinforced concrete (FRC). More than 100 concentric pullout specimen s were tested and the effect of several parameters on the local band s tress-slip response of reinforcing bars was investigated. These includ ed diameter of reinforcing bar (No. 6 and 8); mode of bond failure (pu llout, splitting), concrete splitting area surrounding the reinforcing bai; and type, volume fraction, and aspect ratio of fibers. Discussio n of the test results is undertaken and a simple analytical model desc ribing the local bond stress-slip relationship for reinforcing bars em bedded in plain and FRC and subjected to monotonically increasing load in tension is presented. The model accounts for most of the important parameters that influence the local bond stress-slip response as obse rved in the experiment.