Finite Element Analysis of Flexural Performance of Different Fiber Reinforced Reactive Powder Concrete Beams

In this paper, the mixing ratio of carbon fiber and steel fiber was changed respectively under different environmental conditions. The influence of different mixing ratio of carbon fiber and steel fiber on the flexural performance of the reactive powder concrete beam was analyzed by finite element method. The results show that: In the condition of corrosive environment, the incorporation of 1.5% volume fraction of carbon fibers in RPC can significantly improve the mid-span bending moment and deflection of RPC beam in the initial cracking state and the yield state. This can effectively prevent the generation of early cracks, and when the generation of cracks to inhibit the development of cracks. Under normal environmental conditions, the incorporation of 2.0% volume fraction of steel fibers in RPC significantly increased the mid-span bending moment and deflection in the initial cracking state of the beam, Which can effectively prevent the occurrence of the initial cracks, and effectively delay and inhibit the expansion of cracks after the cracks are generated, greatly improve the brittle performance of RPC and improve the flexural performance of the beam. Based on the results of finite element analysis, the formula for ultimate flexural bearing capacity of fiber reinforced RPC beams is deduced.