Nonlinear numerical analysis of prestressed concrete beams and slabs: Fid-Bau Portal

Nonlinear numerical analysis of prestressed concrete beams and slabs

Rodrigues da Silva, Amilton / Paulo de Souza Rosa, João

Highlights • Numerical model with separate discretization for reinforced concrete slab and active reinforcement; • Efficient Multilayer plate element for nonlinear analysis of reinforced concrete slabs; • Efficient bar element for nonlinear analysis of reinforced concrete beams with any cross-section; • Implementation of an interface element that connects the prestress cable to the concrete element; • The interface element positions the cable relative to the mid-plane of concrete slab; • Analysis of several examples of the literature with detailed description; • Optimum computational performance compared to other numerical models;

Abstract Due to the development of new constructive techniques, designof structures in prestressed concrete has been widely used in the practice. In this work the plate, bar and interface finite element formulations for numerical simulation of prestressed concrete beams and slabs is presented. Emphasis is given on the interface element that has the function of simulating a possible slip between the concrete and the prestress tendon as well as the stress and strain in that tendon. This interface element together with the proposed numerical model are the main contributions of this work. Some numerical and experimental examples obtained from the literature are used to validate the proposed model. In the numerical analysis presented in this article the concrete slabs are modeled with rectangular plate elements and the concrete beams modeled with bar elements. The active reinforcement and the contact between the active reinforcement and the concrete are modeled by interface elements. The geometric and material non-linearity are considered in the numerical analysis. The examples analyzed show the efficiency of the proposed model.