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 totorsion by applying the endochronic plastic model in conjunction with the softened truss model. Theendochronic constitutive equations are developed to describe the behavior of concrete. The mechanicalbehavior of concrete is decomposed into hydrostatic part and deviatoric part. New definition of the bulkmodulus and the shear modulus are defined in terms of compressive strength of concrete. Also, newdeviatoric hardening function is developed. Then, the endochronic constitutive equations of concrete areapplied with the softened truss model for the behavior of the reinforced concrete beams subjected totorsion. The theoretical results obtained based on the present model are compared with the experimentaldata. The present model has shown the ability to describe the behavior of reinforced concrete beamssubjected to torsion.