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Strain Life Approach for the Fatigue Evolution Model of Concrete under Constant Amplitude Bending Fatigue Loading

Indra Narayan Yadav, Dr. Kamal Bahadur Thapa

Abstract


Strain life approach for the fatigue evolution model of concrete under constant amplitude bending fatigue loading plays a very important role in the material properties such as the fatigue strain, fatigue modulus and fatigue damage, presented in this paper by the nonlinear fatigue evolution model, and the hypothesis of recycle-ratio-related fatigue strain amplitude that causes stiffness degradation and inelastic deformation. The fatigue evolution model of concrete under constant amplitude bending fatigue loading, is developed by using the general framework of interior variable theory of continuum thermodynamics. From both models, it is argued that within the damage outward of given strain states that the unloading–reloading cycles (fatigue loading) stimulate the nucleation and growth of micro-cracks in concrete, resulting in stiffness reductions and plastic deformation, termed as Fatigue damaged. The established evolution model, the fatigue strain, regarding the hypothesis of fatigue modulus is inversely proportional. The fatigue strain, fatigue modulus and fatigue damage evolution model is described in three stages, namely variation, linear and convergence stage depending upon the strong adaptability and high accuracy with coinciding fitting curves with the experimental curve, and the correlation coefficients were all above 0.97 by making differences that the fatigue strain evolution curve is from the lower left corner to the upper right corner, but the fatigue modulus growth curve is from the upper left corner to the lower right corner and in another model, damage is reflected through the fourth-order stiffness parameters through the consistency equations related to cycle-dependent damage in strain-based modeling

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DOI: https://doi.org/10.37628/jsea.v5i1.444

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