Fatigue Properties of Plain Concrete under Triaxial Tension-Compression-Compression Cyclic Loading

Dongfu Zhao,Penghe Jia,Huixuan Liu,Jianhui Yang,Haijing Gao

doi:10.1155/2017/9351820

Abstract

Fatigue tests were performed on plain concrete under triaxial tension-compression-compression (T-C-C) cyclic loading with constant and variable amplitude using a large multiaxial machine. Experimental results show that, under constant amplitude fatigue loads, the development of residual strain in the fatigue loading direction depends mostly on the lateral compressive stress ratio and is nearly independent of stress level. Under variable amplitude fatigue loads, the fatigue residual strain is related to the relative fatigue cycle and lateral compressive stress ratio but has little relationship with the loading process. To model this system, the relative residual strain was defined as the damage variant. Damage evolutions for plain concrete were established. In addition, fatigue damage analysis and predictions of fatigue remaining life were conducted. This work provides a reference for multistage fatigue testing and fatigue damage evaluation of plain concrete under multiaxial loads.

Highlights

Many concrete structures such as offshore platforms, nuclear reactor pressure containers, and bridges are subjected to repeated loading amplitudes in complex multiaxial stress states during normal use
He et al [2, 3] focused on the multiaxial mechanical properties of plain recycled aggregate concrete (RAC) and found that the ratio of triaxial fatigue strength to the corresponding uniaxial compressive strength for the three strength grades of RAC was higher than that of conventional concrete
Constant amplitude cyclic loading is mainly dependent on the lateral compressive stress ratio and is mostly independent of stress level

Summary

Introduction

Many concrete structures such as offshore platforms, nuclear reactor pressure containers, and bridges are subjected to repeated loading amplitudes in complex multiaxial stress states during normal use. Park et al [1] used thin fire-damaged concrete discs to evaluate tensile strength and found that the tensile strength could be effectively estimated from the HNP without consideration of the mix proportion. He et al [2, 3] focused on the multiaxial mechanical properties of plain recycled aggregate concrete (RAC) and found that the ratio of triaxial fatigue strength to the corresponding uniaxial compressive strength for the three strength grades of RAC was higher than that of conventional concrete. Shiming and Yupu [7] studied on biaxial T-C strength and found that tensile compressive strength

Methods

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Discussion

Conclusion