Experimental Study on Torsional Behavior of steel Fiber Reinforced Concrete Members under Pure Torsion

Abstract

An experimental study was conducted on ten steel fiber reinforced concrete specimens with low longitudinal reinforcement ratio to investigate the torsional behavior under pure torsion. The crack patterns, cracking torque, ultimate torsional strength, and torsional ductility, were discussed. The major parameters were the ratio and type of adding steel fiber. The obtained results showed that the cracks width of end hooked steel fiber specimens were wider than the corrugated steel fibers specimens, the cracks width decrease with increase the steel fiber ratio, and the number of cracks of end hooked steel fiber specimens were less than the corrugated steel fibers specimens. In the specimens of mix steel fiber, the width and the number of cracks less and more than other specimens, respectively. The higher percentage of the steel fiber, gives greatest torsional resistance. However, with an increase in the percentage of steel fiber the workability decreases.