Torsional behavior of steel fiber reinforced concrete beams under combined torsion-bending-shear

Abstract

An experimental investigation is carried out to assess the torsional behavior of steel fiber reinforced concrete (SFRC) rectangular beams, with longitudinal and web reinforcement, subjected to combined torsion-bending-shear. The tests were conducted on twenty samples of prototype and studied for their torsional resistance for combined loading under torsion-bending-shear. For all these beams, all the parameters were maintained identical except the three chosen parameters viz. torsion to moment ratio (T/M), torsion to shear ratio (T/V) and percentage of web reinforcement. The values of aspect ratio and volume fraction of fibers were kept uniform to 60 and 0.6% respectively for all the beams. The study involved the influence of web reinforcement on the ultimate torsional strength of SFRC beams under variable values of T/M and T/V ratios. The test results are compared with proposed model.