Input parameters of three-layer steel fiber concrete beams

Many researchers have shown interest in the study of bending concrete beams. One method involves using multilayer concrete beams with a layer of steel fiber concrete. This technique aims to improve the beams' capability for supporting load and to minimize the occurrence of cracks, particularly in areas subjected to high compressive and tensile stress. The primary goal is to reduce the stress in these beams. An advantage of using three-layer steel fiber reinforced concrete beams is the ability to repair damaged beams by adding another layer of concrete on top or below the existing concrete layer. Modifying the input parameters during the three-layer beam design process significantly impacts the overall effectiveness of the beams. In this study ANSYS simulation and nonlinear material analysis was used. The objective of the study was to investigate the behavior of three-layer bending concrete beams subjected to two concentrated loads. Specifically, the study examined the impact of varying the content of steel fiber in the concrete, as well as the effects of slirrup at the ends of the beams. Furthermore, the study explored the influence of changes in the quantity and size of steel bars in the places of tensile strength, along with the effect of varying the steel fiber concrete layer's thickness. The research results on three-layer beams were used to create diagrams that depicted the relationship between load and vertical displacement, load and stress in the compressive area, and load and stress in the tensile zone. These diagrams also helped to determine the initiation and progression of cracks in three-layer beams, starting from the application of load until the utter damaging of beams. Ultimately, this information allowed to identify the specific load level that had caused the cracking and the damaging of beams.