Análise da influência de fibras de aço em consolos curtos e monolíticos de concreto.

Abstract

Currently, in civil construction, more importance is given to the speed of production and the economy in the construction process, so the precast structural elements emerge as a response to market needs. Among them is the corbel, element in balance, on the sides of collumns. Its production is facing problems due the need for a high reinforcement ratio in a very short space. Thus, this study aims to evaluate the increased resistance to cracking of the compression strut when are introduced steel fibers in different proportions to the concrete without in comparison to the usual system. Laboratory tests were characterized by (granulometry) and mechanics (tensile strength of steel, strength to compression simple, testing of rupture of the models) in three models of corbel: one without steel fibers and two others with fibers (0.5 and 1%). Finally, this study shows the efficiency of the use of steel fibers, where varying their percentage in the matrix of concrete, has increased the load that will cause the failure of the corbel, load that exceeds the conventional method with splitting reinforcement, besides promoting increments in the load of initiation of cracking and indicate an increase in ductility.