Recently, the studies turned to the existence of alternative methods for reinforcing steel, they reached the use of FRP (fiber reinforced polymer) as an effective alternative to reinforcing steel because it is characterized by high strength, excellent corrosion resistance, prevent the deterioration of a structure and improve its durability and low thermal conductivity but it has low elastic modulus which leads to the large deflection and the more cracks. Moreover, FRP rebars are linear elastic material which is prone to brittle failure of structure.
This research aims to investigate the efficiency of using Hybrid reinforcement on the flexural behavior of reinforced concrete beam, The experimental test program is prepared to test some models of reinforced concrete beams with different reinforcement types under the influence of bending loads. For that purpose, four beams were cast and tested under a four-point load system up to failure. All beams have dimensions 150×300×1700 mm and same reinforcement ratio 0.57%. For all beams, two 8 mm steel bars were used as top reinforcement to hold stirrups and 8 mm diameter stirrups @ 100 mm c/c spacing were used as shear reinforcement. Steel reinforcement bars, GFRP bars, and Hybrid reinforcement were used as main reinforcement for tested beams. To check the suitability of such beam element, The flexural behavior of RC beams was investigated in terms of crack load, load-deflection curves, energy absorption capacity, ductility index and crack patterns. The results showed that using hybrid reinforcement enhance structural behavior of RC beams For RC beams with hybrid reinforcement bars, the enhancement in the load-carrying capacity occurred due to the high tensile strength of the GFRP bar in addition to the tensile strength of steel bar.

hybrid reinforcement; RC; GFRP; tensile strength and flexural behavior