The Finite Element Analysis Of Reinforced RPC T Beam Shear Performance

Reactive Powder Concrete (RPC) is a kind of material of ultra-high strength, high toughness and high durability, which is obviously different from normal concrete in material composition and the principle of preparation. Because the mechanical property, deformation and failure mode of RPC beams are different from normal concrete, it is necessary to study the shear performance of RPC beams, which provides a reference for the shear design of RPC beams.In this paper, the numerical analysis on shear performance of RPC beams'diagonal section is based on the nonlinear finite element method, taking the stirrup ratio, longitudinal reinforcement ratio, and shear-span ratio into considered. The compression constitutive equation that is fitted using the experimental data is applied to the finite element analysis to consider the property of RPC material. In order to simulate the experimental beams better, lots of calculations are done with different values of model parameters, different loading methods and different convergence criteria. Comparing with the test results of load-deflection curve, crack distribution and stress condition, the analyzed results of nonlinear finite element agree well with the test results. It is certified that the nonlinear finite element method applied to study the shear performance of RPC beams is available.The effect of influencing factors of shear-span ratio, stirrup ratio, longitudinal reinforcement ratio, flange width, and concrete strength to shear strength of RPC beam are analyzed systematically by using the nonlinear finite element software ANSYS. And then draw the influence law of each factor.Based on the conclusion of the influence of parameters to shear strength, combining with several calculation formulas for the shear strength of the current specifications, the suggestion formula of calculating shear strength of RPC beam is proposed. It correlated well with the test results. That indicates the suggestion formula can be used as a reference for the shear resistance design of RPC beams.