Análise numérica de vigas mistas protendidas

Abstract

In metal and/or mixed constructions, solutions are commonly used in composite steel and concrete beams. These beams are formed by the association of a metallic profile with the upper slab, by means of shear connectors, bringing a significant gain in relation to the isolated steel beam. Protension is a traditional technique in concrete structures, and aims to improve the behavior of the structure by introducing a previous state of stresses by means of pretensioned cables positioned internally or externally to the metal profile. Recent works indicate that the use of prestressing steel can make a great contribution to the load capacity of the composite beams, as well as their behavior in service. Few studies, however, were developed regarding the numerical analysis of these structures. Therefore, the present work aims to present the development of a finite bar element model for simply supported composite beams projected through external tendons, considering the physical and geometric nonlinearity in the formulation. The methodology is based on the combination of a preexisting computational code, able to numerically simulate prestressed concrete structures in non-linear analysis, with the composite steel and concrete beam elements developed and implemented, and the results evaluation will be done through comparisons with numerical and experimental results available in the literature.