Behaviour of Fibre Reinforced Concrete Beams in Pure Torsion, Combined Bending and Torsion

Abstract

In structures where equilibrium torsion occurs, in addition to shear and flexure, torsion should be calculated and designed for torsional strength of sections. The sections made with homogeneous materials can be estimated quite accurately using theory of elasticity. But it is very difficult to assess the torsional strength of heterogeneous reinforced concrete sections. The problem becomes more acute because such members are seldom under pure torsional; rather they are subjected to bending shear and torsion. Many theories have been proposed to explain the phenomenon of torsion in reinforced concrete, such as skew bending theory and space truss analogy. A large amount of experimental research has also been devoted to the subject.