Análise numérica de vigas mistas protendidas com interação parcial

Abstract

The prestressing technique, however traditionally referenced to concrete structures, has been shown to be very beneficial and useful when used in composite structures. Several works indicate that when pretensioning composite beams through the insertion of steel cables, several benefits can be obtained: elastic behavior in situations of high load, greater capacity resistant, reduction of useful height of the beam and better behavior in situations of fatigue. In addition, the prestressing technique can be used to reinforce existing composite beams, where the likelihood of deterioration-related problems is higher, such as bridge beams and walkways. In composite beams the interaction that exists at the interface of the steel beam and the concrete slab has a lot of influence on the structural behavior of the part. In practice, for a composite element to have no relative slip between the materials, the rigidity at the contact interface should be high, which leads to the use of a large number of shear connectors. Based on the need to obtain more information about this technique, the present work aims to promote a numerical analysis of prestressed composite beams in a nonlinear regime, considering the possibility of slip at the contact interface of the composite beam. The methodology is based on the use of a computer code developed by the authors through the Matlab program. Such code is based on the Finite Element Method. Initially, the results obtained by the program will be validated through comparisons with experimental results of specific examples of the literature that consider the material and geometric nonlinear analysis of these structures. Finally, the objective of this work is to evaluate the influence of the tracing of the protension cable on the structural behavior of the composite beam.