A thermodynamically based microplane fatigue damage model for plain concrete under compressive loading is introduced. The key idea of the present approach is to relate the fatigue dam- age to a cumulative measure of inelastic sliding/shear strains. Which reflects the…
A thermodynamically based microplane fatigue damage model for plain concrete under compressive loading is introduced. The key idea of the present approach is to relate the fatigue dam- age to a cumulative measure of inelastic sliding/shear strains. Which reflects the fatigue damage accumulation owing to internal friction at subcritical fatigue loading level. The model is formulated within the microplane framework using a homogenization approach based on the energy equivalence principle with explicit representation of the effective triaxial elastic stiffness. The model can reflect the damage-induced anisotropic behavior of concrete and can reproduce the shape of the hysteretic loops related to the fatigue damage development within the tensorial representation of the material state. Elementary studies of the model response and its applicability to modeling of the fatigue re- sponse under compression are presented. The ability to reproduce the typical shape of the hysteretic loops is discussed and compared to the existing phenomenological fatigue models for concrete under compression.