ABSTRACT
B. Belletti & C. Damoni DICATeA, University of Parma, Parma, Italy
ABSTRACT: In this paper the behavior of prestressed reinforced concrete beams and in particular the shear resistance is analyzed. Even if several different theoretical approaches and numerical models have been proposed over the last years to calculate the shear capacity of prestressed reinforced beams, the problem is not fully solved. A general agreement among researchers is not achieved and also formulations implemented in codes are mostly based on experimental test data. In this paper it is demonstrated that the last formulations contained in Eurocode 2 (EN 1992-1-1: 2004) bettered the prediction of the shear capacity of prestressed beams by a new formulation of the coefficient αc. NLFE analyses have been carried out to simulate the behavior of the prestressed beams tested in laboratory by Levi and Marro (Levi and Marro, 1992) and to check the effectiveness of αc values recommended by Eurocode 2 (EN 1992-1-1: 2004). The PARC constitutive model (Belletti, 2001), theoretically formulated at the University of Parma and implemented in the user’s subroutine UMAT.for is adopted to carry out NLFE analyses with ABAQUS Code.
