The Simulation Of Fatigue Properties Of Concrete Under Cyclic Loading

Based on the energy dissipation mechanism, this paper will focus on using thefinite element software ABAQUS to establish a simulation analysis of concretestructures under fatigue performance, then analog the load-deflection relationship andthe load-notch opening displacement relationship of the member, and proved thevalidity and practicality of the theoretical model through the comparison of thesimulated curve with the experimental results. This article also summarized somemodels of fatigue damage constitutive used in the analyses of concrete structure.Because of the damage mechanics, especially the damage evolution rule depend on thefracture energy and dissipating energy, a monotonous and a flexural model aredeveloped by using nonlinear unloading-linear reloading stress branches.With the aid of ABAQUS transplantation of the model was obtained and thetheoretical model could be applied to practical engineering. To build a concrete fatiguedamage model on the FORTRAN statement, the judgment of yield, unload roaddescription, nonlinear iteration, stress-strain and Jacobi matrix can be obtained bynumerical calculation. Through UMAT, the model can be implanted into the largecommercial finite element software ABAQUS to establish a uniaxial monotonic anduniaxial fatigue damage load simulation analysis platform of concrete.The mechanical properties of concrete structures under uniaxial monotonic anduniaxial cyclic loadings are simulated rely on the simulated analysis platform. Thestiffness degradation, accumulation of residual deformation, hysteretic energydissipation of concrete material under uniaxial cyclic loading can be well reflected bythe simulation curve.The model introduced in this article can simulate the real responseof concrete under uniaxial monotone loading and uniaxial bending low cyclic loading,thus proved the rationality of transplantation from theoretical model to finite elementanalysis, and the transplantation reciprocally provided an appropriate platform for thetheoretical model used in concrete fatigue damage analysis.