Investigation of concrete strenght and development length effects on bond strenght by using hinged beam test

As it is known, reinforced concrete owes its existence to the bond strength between concrete and steelrebar. Although many studies have been carried out on bond strength, the subject has not been fully clarified as bond strength phenomenon is complicated. Therefore, in this thesis, the bond strength between rebar and concrete produced by using different rebar diameters, development lengths and cement dosages have been experimentally observed in bending with the help of hinged beam test. The experimental work was carried out in two series using different reinforcement diameters and development lengths (100 mm, 150 mm, 200 mm) with constant 300 dosage and different rebar diameters and a constant 100 mm development length with 250, 300, 400 and 500 dosages. Experiments were carried out on a total of 18 hinged beams. The results of the experiment showed that development length, concrete strength and reinforcement diameter significantly affect the bond strength. While the maximum stress increased for extending development length and concrete strength, slips decreased, as the reinforcement diameter expanded stress values decreased while the slip increased. The maximum load rates achieved for 10, 12 and 14 in variable concretes produced with four different dosages on different concrete strengths for the same diameter and development length increase respectively between %5-34, %13-29, and % 8-26.