EFFECT OF CROSS SECTIONAL ASPECT RATIO ON THE TORSIONAL STRENGTH OF STEEL FIBER REINFORCED CONCRETE MEMBERS

摘要

The resistance of a structural member to a torsional moment has been one of the most difficult problems of engineering mechanics since many years. This problem becomes more complicated with non-homogeneous materials such as concrete or fiber reinforced concrete. The behaviour of torsional members is generally depicted by the torque-twist response of the members. After micro-cracking, the beam collapses due to inherent brittleness of the matrix. Fiber inclusion in such matrices improves the behaviour of the members after micro-cracking. The ductility of the composite increases many folds compared to plain concrete matrix with a corresponding increase in strength. To quantify the effect of fibers as well as the aspect ratio of the cross section, 15 steel fiber reinforced concrete (SFRC) members were tested under pure torsional loading. The variables considered in this study are volume fraction of the fiber and depth to breadth ratio of the cross section.