Influência da forma de seção transversal no confinamento de pilares de concreto armado encamisados com PRFC (polímero reforçado com fibras) / Influence of the cross section shape in the confinement of jacketed reinforced concrete columns with CFRP (carbon fiber reinforced polymer)

AUTOR(ES)

Alexandre Luis Sudano

DATA DE PUBLICAÇÃO

2005

RESUMO

The effect of the concrete confinement in columns submitted to the axial compression brings many benefits to its structural behavior, amongst them the increase of the axial compressive strength due to the action of the lateral pressures and the improvement of the ductility. In function of these advantages, the confinement is one of the main techniques for strengthening of concrete columns. However, depending on the shape of the cross section, the efficiency of the reinforcement can be impaired by the non-uniformity of the confinement pressure distribution. In the case of circular cross section columns, this distribution is uniform. Otherwise, in square and rectangular cross section columns, there is a pressure concentration at the cross section corners. In case of CFRP jackets, the pressure concentration leads to a premature rupture of the jacket, resulting in an inefficient reinforcement. Intending to consider the different confinement pressure distributions, a shape coefficient is applied to cross sections with distinguished shape from the circular one (for which this coefficient is equal to the unit), to correct the confinement pressure value. The corrected pressure is applied in theoretical evaluations of the column’s load carrying capacity. The main objective of work is to analyze the structural behavior of strengthened concrete columns with different shape cross-sections, evaluating the influences in the efficiency of the jacketing and in the ductility of the structural element. Experimental simulations were made in columns with the following cross section shapes: circular, square and rectangular with rounded corners, elliptical and a section composed by semicircles. The results demonstrated that an adequate shape of the cross-section is essential for a good performance of the strengthened columns. The cross sections that presented the best results were the circular, the elliptical and the one composed by semicircles

ASSUNTO(S)

cross section shape ductility and tenacity ductilidade e tenacidade reforço de pilares - encamisamento carbon fiber reforço de pilares - confinamento fibra de carbono concrete column strengthening - jacketing forma da seção transversal concrete column strengthening - confinement

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