Simulação numérica de vigas T em concreto armado reforçadas ao cisalhamento com Compósito de Fibra de Carbono (CFRP) utilizando o modelo Concrete Damaged Plasticity (CDP).

Abstract

The need of repairing and strengthening reinforced concrete structures is increasing, advancement of building techniques, construction materials and computational methods provide slenderer structures and bolder architectural designs, often more susceptible to pathologies that compromise the element's resistance. Subsequent need for increased strength due changes in use of the building is also a contributing factor of the growing study of structural reinforcement techniques. As for shear stress it is known as a brittle fracture stress and possesses complex measurement due to the influence of different mechanisms and parameters. The materials known as CFRP (carbon fiber polymers) are an alternative to conventional reinforcement procedures, having as main advantages the easy implementation and elevated resistance. This work presents an analytical study of shear through NBR 6118 (2014) and ACI 318 (2011) standards, shear strengthening with CFRP following ACI 440-2R (2008) and numerical finite element method (MEF) through ABAQUS software considering physical nonlinearity. The analytical and numerical results were compared with experimental data from Silva Filho (2001) in order to validate the numerical modeling. Models were made for four reinforced concrete beams, three of those strengthened with CFRP under two settings and variant spacing.

Key words: CFRP; Concrete; Strengthening; Shear; Numerical modeling.