Mecanismos de confinamento e suas implicações no reforço de pilares de concreto por encamisamento com compósito de fibras de carbono / Confinement effects and their implication on the strengthening of concrete columns by wrapping with carbon fiber composites.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

This work deals with the effect of confinement in reinforced concrete columns strengthened with carbon fiber composites. By wrapping, it is possible to mobilize the passive confinement of the concrete, restricting its lateral expansion. With the confinement, the concrete shows substantial gains in resistance and ductility. An experimental analysis of circular columns was carried out making use of different rates of transverse steel and numbers of composite layers. The influence of these variables over the load carrying capacity and deformability of these columns was observed. With an increased number of layers of the composite, there was a great increase in the load carrying capacity, even at high transverse steel rates. The increase in the ultimate strain given by the strengthening was great with unreinforced concrete columns. In columns with a high transverse steel rate there were no important gains in the ultimate strain. It was observed that in reinforced concrete columns strengthened with carbon fiber composites, one can very well foresee the gain in strength by using adequate analytical models of confinement and the overlaying of lateral pressures from the composite jacket and the transverse steel in the central core. Square columns without reinforcement bars were also subject to testing so as to investigate the effect of the shape of the cross-section. It was observable that in square sections the real lateral pressure is smaller when compared to circular columns.

ASSUNTO(S)

reinforced concrete reforço strengthening fibras de carbono pilares columns composites compósitos carbon fibers confinement concreto armado confinamento

ACESSO AO ARTIGO

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