Oral Presentation

¹Ahmed Godat ; ²Said Elkhouly

¹Ajman University; College of Engineering, Civil Eng. Dept

²Fayoum University; College of Engineering, Civil and Env. Eng. Dept

Previous experimental results confirmed that steel fibers have the capability to act as a viable substitute for conventional steel stirrups and effectively providing shear reinforcement in deep beams. Furthermore, the addition of steel fibers resulted in a significant improvement in both the shear strength and ductility of concrete beams, even at the absence of traditional shear steel reinforcement. Researchers suggested empirical and semi-empirical design equations to estimate the shear strength of steel fiber reinforced concrete deep beams. These equations are based on some factors such as: concrete compressive strength, shear span-to-effective depth ratio, steel fiber volume ratio, and fiber bond strength. It should be noted that existing design standards do not include design equations for estimating the shear strength of beams including steel fibers. In this study, available design equations are utilized to estimate the shear strength of steel fiber reinforced concrete deep beams and the accuracy of each equation is accounted for. The equations are compared to various finite element model predictions of shear strength, where deep beams have various values of shear-span-to-effective depth ratio, steel fiber volume ratio, concrete compressive strength, and long or short fibers. The theoretical predictions reveal that the equations of Mansur et al., and Narayanan and Darwish demonstrated high accuracy compared to the numerical predictions of finite element models. High discrepancy is obtained when implementing Swamy et al. equation.

deep beams; Steel-fibers; Shear strength; Design equations; Finite element models; Numerical predictions

Structural and Construction Engineering