Behavior and Capacity of CCT Nodes Anchored By Headed Bars in Fibrous Concrete Beams

Abstract

In the current research, the method of reinforcing by means of "Headed Bars" reinforcement was utilized in order to study the behavior of fiber reinforced beams, then conducting a comparison study with conventionally reinforced beams without "headed bar", where by headed bars were placed at the CCT node to analyze the behavior of the node. The presence of the headed bar with regard to bearing capacity, failure mode, and anchorage length for the reinforcing bar at the tension zone. Where the presence of the headed bar will help in reducing the anchorage length necessary to bring the reinforcing steel to yield stress (fy).This is the main objective of using such head bar reinforcing. In addition the use of this reinforce enables in the reduction of cost and the congestion of reinforce as well as the hooks. Four ratios of steel fiber and three values of shear span were used in order to find out the effect of those variables on the behavior of beams with headed bars reinforce regarding :bearing capacity, deflection under single point load, shape and type of failure,….etc. It was noticed that the bearing capacity, stiffness and ductility increased with the increased of volumetric steel fiber addition, also in the presence of headed bars reinforcement when compared with conventionally reinforced beams without steel fibers. The bearing capacity reduced as the shear span length increased.