Fatigue damage model of concrete materials

Abstract

Based on the continuum damage mechanics theory of concrete materials under fatigue loading; a phenomenological fatigue damage model due to nuclei-propagation of microdefects, microvoids and fractal of rendered concrete in conjunction with more compliant are developed by utilizing internal variable theory of thermodynamics. Experimental data from fatigue test were employed to verify the model and results shows that the model can describe the damage evolution of concrete materials under different fatigue loading by verifying the predicted fatigue life of concrete materials in uniaxial compression loading. Degradation of Young's Modulus, alteration in the mechanical behaviour, damage in elastic stiffness tensor, evolution in strain, damage development corresponding to the Normalized life, and its accumulation subjected to constant amplitude fatigue loading including its verifications are well discussed.