This paper presents a study on the compressive behavior of steel fiber-reinforced concrete. In this study, an analytical model for stress-strain curve for steel fiber-reinforced concrete is derived for concretes with strengths of 40 MPa and 60 MPa at the age of 28 days. Those concretes were reinforced with steel fibers with hooked ends 35 mm long and with aspect ratio of 65. The analytical model was compared with some experimental stress-strain curves and with some models reported in technical literature. Also, the accuracy of the proposed stress-strain curve was evaluated by comparison of the area under stress-strain curve. The results showed good agreement between analytical and experimental data and the benefits of the using of fibers in the compressive behavior of concrete.
ABSTRACT. In this paper, the mechanical behavior of steel-fiber-reinforced concrete was investigated to analyze the influence of steel fibers on tension stiffening. Using tension tests, the tension stiffening coefficient was evaluated through the load versus strain responses obtained from strain gages fixed to reinforcement steels. Moreover, an empirical model is proposed to estimate the tension stiffening coefficient of steel-fiber-reinforced concrete from reinforcement strains. From the test results, it was verified that the addition of steel fibers to concrete reduced the reinforcement steel strains and the crack width and increased the stiffness of cracked concrete, mainly in concretes reinforced with high volumes of fibers.Keywords: tension tests, empirical model, crack width.Análise do regime pós-fissuração do concreto armado reforçado com fibras de aço RESUMO. Neste trabalho foi investigada a influência das fibras de aço no regime pós-fissuração do concreto armado submetido à tração. Para isso, foram ensaiados tirantes de concreto armado, dos quais foi obtido o parâmetro de endurecimento do concreto no regime pós-fissuração por meio de extensômetros colados nas barras de aço. Dos ensaios é proposto um modelo empírico para estimativa do parâmetro de endurecimento do concreto reforçado com fibras de aço. Os resultados mostram que a adição de fibras de aço ao concreto reduziu a deformação da armadura e a abertura das fissuras nos tirantes após a fissuração do concreto, com consequente aumento da rigidez do tirante quando comparada ao concreto sem adição de fibras. Esse efeito foi tanto mais acentuado quanto maior era o volume de fibras adicionado ao concreto.Palavras-chave: tirante de concreto, modelo empírico, abertura de fissura.
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