Preprint Article Version 1 This version is not peer-reviewed

Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the Model formulation of Concrete based on Strain Life Approach

Version 1 : Received: 20 May 2019 / Approved: 22 May 2019 / Online: 22 May 2019 (11:49:56 CEST)

How to cite: Yadav, I.; Thapa, K.B. Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the Model formulation of Concrete based on Strain Life Approach. Preprints 2019, 2019050275 (doi: 10.20944/preprints201905.0275.v1). Yadav, I.; Thapa, K.B. Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the Model formulation of Concrete based on Strain Life Approach. Preprints 2019, 2019050275 (doi: 10.20944/preprints201905.0275.v1).

Abstract

Analysis of Fatigue Strain, Fatigue Modulus and Fatigue Damage for the modeling of concrete plays a vital role in the evolution material behaviour which is heterogeneous and anisotropic in nature. In this paper, the Level-S nonlinear fatigue strain curve, fatigue modulus curve, residual strain curve of concrete in compression, tension, flexure and torsional fatigue loading were proposed using strain life approach. The parameters such as physical meaning, the ranges, and the impact on the shape of the curve were discussed. Then, the evolution model of fatigue modulus was established based on the fatigue strain evolution model, fatigue modulus evaluation model, residual strain evaluation model, secondary strain evaluation model. The hypothesis of fatigue modulus is inversely related with the fatigue strain amplitude. The fatigue evolution of concrete damages the bond between material grains, changed the orientation of structure of molecules and affects the elastic properties resulting in the reduction of material stiffness and modulus by utilizing strain life analysis, regarding stiffness degradation and inelastic deformation by formation of microcracking, macro cracking, cracking which is heterogeneous and anisotropic in nature . This paper presents the Fatigue Strain Life Model and analyses of fatigue strain, fatigue modulus and damage parameters of concrete which is capable of predicting stiffness degradation, inelastic deformation, strength reduction under fatigue loading. Hence, the obtainable results were compared with experimental results for the validation of the proposed model.

Subject Areas

Fatigue Strain Life Approach; Fatigue Strain evolution Model; Fatigue Modulus evolution Model; Fatigue residual strain evolution Model; Fatigue Secondary Strain; Stiffness.

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