Application of softened truss model with plastic approach to reinforced concrete beams in torsion

The present paper discusses the behavior of the reinforced concrete beams subjected to<br />torsion by applying the endochronic plastic model in conjunction with the softened truss model. The<br />endochronic constitutive equations are developed to describe the behavior of concrete. The mechanical<br />behavior of concrete is decomposed into hydrostatic part and deviatoric part. New definition of the bulk<br />modulus and the shear modulus are defined in terms of compressive strength of concrete. Also, new<br />deviatoric hardening function is developed. Then, the endochronic constitutive equations of concrete are<br />applied with the softened truss model for the behavior of the reinforced concrete beams subjected to<br />torsion. The theoretical results obtained based on the present model are compared with the experimental<br />data. The present model has shown the ability to describe the behavior of reinforced concrete beams<br />subjected to torsion.