A Review Paper on Increasing Torsional Strength of RC Beam using Steel Fiber Reinforced Concrete

Abstract

Steel fiber reinforced concrete (SFRC) is the most used mechanism now a days to improve the flexural, shear and torsional property of concrete. It has the capability to resist the cracks and crack propagation. As a result of this ability to arrest cracks, fiber composites can increase extensibility and tensile strength, both at the first crack and ultimate load and fibers can hold the matrix together after extensive cracking. Steel fibers are short in length which are used in concrete according their aspect ratio (i.e. ratio of length to diameter) ; varies between 20 to 100. Torsion is usually attached with bending moment and shear force so the interaction between these forces is important. Torsion results from supporting a slab or beam on one side only, or supporting loads that act far away transverse to the longitudinal axis of the beam. Many researchers done a lot of work with steel fiber reinforced concrete to increase the flexural and shear capacity of concrete but for torsional strengthening the amount of work is negligible. This paper presents the introduction of steel fiber, review of experimental studies about torsional strengthening which has been done in previous years and comparison between Normal concrete beam and SFRC beam about their increase in torsional strength and decrease in angle of twist using different percentages of steel fiber.