Abstract
Flexural, torsional, compressive and shear behavior of Steel Fiber Reinforced Concrete (SFRC) is already studied individually but none has studied the performance of SFRC beams under a combined effect of more than one state i.e. tension, flexure, torsion, compression and shear in general by now. In this study M20 grade of concrete beams under composite behavior of flexure, shear and torsion with different compositions of fibers mix were investigated. The dimensions of specimen beams was 100 mm x 100 mm x 500 mm and straight cylindrical fibers of length 0.28 mm and aspect ratio 100 were mixed. A total of 48 specimen were casted and tested such that for every percentage of fiber and each torsion value three beams were tested. Hence there are four torsion values 0, 61.75, 119.41 and 176.53 N-m are applied (4x3x4=48) It was found during study that ultimate bending stress and deflection increases due to increase in torsion where as the ductility reduced with the torsion enhancement for a specific fraction of fiber content.
Highlights
Due to low tensile strength; ordinary concrete cracks when undergoes tensile stresses and impact loads and to solve this cracking problem, reinforcement bars of steel are located inside the ordinary concrete
The cracking behavior of steel fiber reinforced concrete is founded to be reduced with smaller crack spacing and reduction in crack width as compared to plain steel reinforced beams Bichoff [3]
The completely cured concrete beam samples were taken out four weeks later and after surface dried brought to be tested at room temperatures under two point load procedure and load vs central deflections readings were observed
Summary
It is surprising that the introduction of fibers to improve the material properties had not advanced a great deal in the period up to the early 1930’s. Post 1930 progress has been more impressive with the most significant gains made after 1960 This can be attributed to both the appearance of man-made fibers and the evolution of a more meticulous scientific approach to the computation of cement based composite behavior. The reinforcement can be provided in fibers form which can be uniformly cast in and distributed all over the concrete medium. When Steel fibers are casted in concrete it enhances load carrying capacity by shifting the burden from the concrete to the fibers. Synthetic fibers can be useful to non-structural and non-primary load bearing practices
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