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<p>The fatigue life of plain concrete under stress reversal is a critical consideration for numerous civil engineering structures subjected to repeated loading from traffic and environmental effects. This study focuses on low-frequency, low-cycle fatigue behavior of plain concrete under uniaxial stress reversal at a high stress level. Testing was carried out at frequencies of 0.1, 0.2, 0.5, and 0.75 Hz. Its purpose is to fill the gap in the area of concrete fatigue testing at frequencies below 1 Hz. The findings indicate that specimens subjected to low-cycle fatigue loading at stress levels of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(0.9f_t\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>0.9</mn> <msub> <mi>f</mi> <mi>t</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> and 0.1Hz frequency led to the highest maximum strains at failure and stiffness degradation, while reporting a longer fatigue life. The reason for that is the gradual damage accumulation in these specimens, with each fatigue cycle contributing the least amount of energy compared to the specimen subjected to higher frequency loads.</p>

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Effect of loading frequency on fatigue life behavior of plain concrete under uniaxial stress reversal loading

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Payam Sotoudeh,
  • Raza Nasir,
  • Dagmar Svecova

摘要

The fatigue life of plain concrete under stress reversal is a critical consideration for numerous civil engineering structures subjected to repeated loading from traffic and environmental effects. This study focuses on low-frequency, low-cycle fatigue behavior of plain concrete under uniaxial stress reversal at a high stress level. Testing was carried out at frequencies of 0.1, 0.2, 0.5, and 0.75 Hz. Its purpose is to fill the gap in the area of concrete fatigue testing at frequencies below 1 Hz. The findings indicate that specimens subjected to low-cycle fatigue loading at stress levels of \(0.9f_t\) 0.9 f t and 0.1Hz frequency led to the highest maximum strains at failure and stiffness degradation, while reporting a longer fatigue life. The reason for that is the gradual damage accumulation in these specimens, with each fatigue cycle contributing the least amount of energy compared to the specimen subjected to higher frequency loads.