Ultimate load carrying capacity of steel fiber reinforced self-compacting concrete haunched beams with stirrups

This thesis includes a comprehensive experimental study regarding mechanical behavior of steel fiber reinforced concrete haunched beams. The experimental study was conducted on 12 reinforced concrete beams, 8 of them are RCHBs and 4 are prismatic beams. Different parameters have been adopted by steel fiber ratio, flexural reinforcement, and inclination angle. All the beams were classified into three modes depending on the angle of inclination. The beams were divided into two main groups, each contains 6 RC beams, each group has the same ratio as the steel fiber (SF) and main steel reinforcement and differs from the other group while all the RC beams have been used as stirrups. The results have shown that as the steel reinforcement ratio increases, the load capacity of the RCHBS with an inclination angle of 10o increases as the amount of 40%. Moreover, the effect of increasing the ratio of steel fiber was clear to increase the failure load as compared to the capacity of the beams without steel fiber. Load capacities of these beams are greater than the capacity of prismatic beams with the same parameters. Increasing of steel reinforcement ratio increases the load capacity of the RCHBS with the inclination angle of 15o as an amount of 26%. However, the addition of steel fiber has slightly affected the increase in load failure. It is also noticeable that the increment the angle of inclination decreases the load capacity. The addition of SF has led to an increase in the ductility of the concrete and collapse load, as well as reducing the thickness of cracks compared with specimens that do not contain steel fiber.