Evaluación del comportamiento de vigas en voladizo de concreto reforzado con fibras ante la aplicación de cargas ćıclicas

Conventional non-reinforced concrete is a brittle material with a low tensile strength and low strain capacity. To improve these mechanical properties of concrete,
fibers have been used in the last decades in structural engineering applications in Colombia, South America. In this document, the authors present the mechanical
behavior of cantilever beams built with three different concrete mixes: one conventional reinforced concrete mix and two steel fiber reinforced concrete mixes with
two percentages of metallic fiber addition (15 kg/m3
and 30 kg/m3
). The beams were tested with cyclic displacements applied with a dynamic actuator in order to
evaluate the hysteresis loops and the energy dissipation capacity. Based on the results, and for the same displacement, the steel fiber reinforced concrete beams
dissipates 160 % more energy than conventional reinforced concrete beams. Additionally, metallic fibers reduce the quantity and length of cracks for high
displacement levels. These characteristic could be beneficial for structural applications and specifically for improving the seismic performance of concrete structures.