IMPROVEMENT OF CONCRETE TORSIONALSTRENGTHBYINCORPORATING RANDOMLY DISPERSE

Abstract

This study investigate the effect of steel fibre on compressive strength and torsion strength of beam. If external load sact faraway from the vertical plane of bending, the beam is subjected to twisting about its longitudinal axis, known as torsion, in addition to the shearing force and bending moment. The current torsion design approach assumes no interaction between flexure, shear and torsion.Inthe present work performance of reinforced concrete beams with and without steel fibres were studied subjected to pure torsion. The experimental program consists of casting 12 reinforced concrete beams of size 150mm X150 mm and length 2m. Three of the mwascast without fibres to make a comparative study with the remaining beams; The group of three beam are casted with 5%fibre,10%fibre&15% fibre. The longitudinal reinforcement with 4 # 8 mm diameter and 6 mm stirrups at 150 mm spacing was kept constant for all beam. The results concluded that the cracking torsional strength and ultimate torsional strength goes on increasing as the percentage of Steel fiber goes on increasing as the mentioned above.