Behavior of Beam with Fiber Reinforcement under Alternating Loads

The use of dispersed reinforcement improves the properties of concrete. Recently, some studies have been conducted to explore the effect of dispersed reinforcement on the behavior of structures under a static load of the same sign or alternating static load when reinforcing with relatively long fibers. The article presents a methodology for experimental study of the behavior of beam elements with dispersed and combined reinforcement under an alternating static load, based on mathematical planning using a specially made frame. The work considers the results of experimental studies of cubes and prisms on a static load and compression. It also presents the results of an experimental study of the behavior of beam structures with dispersed and combined reinforcement with relatively short fibers under low-cycle alternating static action. The behavior of fiber-reinforced concrete and reinforced concrete beam elements under similar influences are compared. The presented results of the experimental studies allow us to show a significant effect of dispersed reinforcement with relatively short fibers on the behavior of beam structures with alternating low-cycle static loads and the feasibility of combined reinforcement of structures operating under such loads. The use of dispersed reinforcement with relatively short fibers in combined reinforced beam structures operating under alternating loads will increase crack resistance, and with a certain percentage of reinforcement, the strength of such structures. Moreover, the use of relatively short fibers will significantly reduce the complexity of manufacturing such structures.