
espanolEl hormigon reforzado con fibras de acero (HRFA) puede tener caracter estructural si cumple las condiciones establecidas por las normas de hormigon estructural basadas en resistencias residuales en ensayos de fractura en Modo I. Sin embargo, para fractura en Modo II no parece adecuado el uso de dichas resistencias. Por esto sigue siendo campo de investigacion el estudio del HRFA ante los mecanismos resistentes de engranamiento de aridos y efecto pasador de la armadura conforme a la teoria de corte-friccion. Cabe recordar que las fibras mejoran el comportamiento del material frente a tensiones de corte en una grieta ya que cosen los labios de la fisura, reduciendo su apertura normal y aumentando el rozamiento del material. Con estos antecedentes, se diseno y desarrollo una campana experimental sobre HRFA para la obtencion de los desplazamientos relativos entre los lados de las fisuras en probetas tipo “push-off” sometidas a esfuerzos de corte directo y adaptar la teoria de corte-friccion desarrollada por Walraven para hormigon en masa. Del estudio comparativo entre los resultados experimentales y el modelo analitico de corte-friccion se concluye que el modelo analitico propuesto se adapta al comportamiento del HRFA, una vez creada la fisura de cortante, reproduciendo de forma adecuada los desplazamientos normales y tangenciales en la fisura sometida a tensiones tangenciales. EnglishSteel fibre reinforced concrete (SFRC) can be considered in structural design if the requirements established by structural concrete regulations are met. Such requirements are based on residual strengths obtained with fracture testes in Mode I. However, for fracture in Mode II it is not clear that such residual strengths are appropriate to be used for structural design. This is why the SFRC study of the resistant mechanisms of aggregate interlock and dowel action, according to shearfriction theory, remains a field of research. It is worth noting that fibres improve the behaviour of the material as they bridge both sides of the crack, reducing their development opening and sliding, preventing the collapse of the material. Based on this background, an experimental campaign on SFRC was conducted to obtain the relative displacements between the lips of the cracks in push-off specimens subjected to shear loading. In addition, the Walraven shear-friction theory is adapted for the simulation of the experimental results. Based on this comparison it is concluded that the analytical model is suitable for simulating post-cracking behaviour of SFRC under shearing loading.
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