Efficient softened truss model for prestressed steel fiber concrete membrane elements

Abstract

In this article, a recent version of the rotating-angle softened truss model proposed by the authors, to compute the full behavior of prestressed concrete membrane elements under in-plane stresses, is extended to prestressed steel fiber concrete membrane elements. For this, the smeared constitutive relationships for the component materials are modified to include the influence of the steel fiber reinforcement. In particular, a new smeared constitutive relationship for steel fiber concrete in tension is incorporated in the model. The extended model, called efficient rotating-angle softened truss model for prestressed steel fiber concrete, is checked against some experimental results found in the literature and related with prestressed steel fiber concrete panels tested under shear up to failure. It is shown that the proposed model is able to predict well the full behavior of prestressed steel fiber concrete membrane elements for all loading ranges, including the influence after cracking of the steel fiber reinforcement.