Enhanced assessment rule for concrete fatigue under compression considering the nonlinear effect of loading sequence

Baktheer, Abedulgader; Hegger, Josef; Chudoba, Rostislav

doi:10.1016/j.ijfatigue.2019.04.027

Cited by 40 publications

(21 citation statements)

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“…This rule assumes linear accumulation of fatigue damage with the increasing number of cyclic loads. Over the years, efforts have been made to formulate this rule involving more factors such as fatigue loading history [ 28 ], stress ratio [ 29 ], thermodynamics potential [ 30 ], and fatigue inelastic parameters [ 20 ]. The modified Palmgren-Miner’s rules have improved accuracy in predicting fatigue life, but face challenges in being widely used in current building codes due to their complex forms [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

“…In summary, most of the aforementioned literature focused on the bond strength of cement-based repair concrete under fatigue loading, but scarce work studied other types of repair such as polymer-modified cementitious mortar, which outperform cement-based concrete repair in many aspects [ 9 , 38 , 39 , 40 ]. Additionally, apart from the exhaustive studies [ 20 , 28 , 29 , 30 , 31 , 41 ] that used Palmgren-Miner’s rule and its modified forms on concrete materials, there are insufficient studies about the applicability of Palmgren-Miner’s rule on predicting the fatigue life of repaired structures. In this study, authors aim to determine the applicability of Palmgren-Miner’s rule to estimate the fatigue life of repaired concrete structures.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Repaired Concrete under Cyclic Flexural Loading

Wang

Gupta

2021

Materials

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There is limited research reported on the effect of cyclic loading on cement-based repair materials as conducting such tests is time consuming. To overcome this issue, this study utilized a novel loading regime consisting of cycle groups with increasing stress amplitude to accelerate the test process. The Palmgren-Minder rule was used to estimate the fatigue life of repaired specimens. Specimens repaired with Mix M (cementitious repair mortar), which was estimated to have the highest 2-million-cycle fatigue endurance limit (77.4%), showed the longest fatigue life (95,991 cycles) during the cyclic loading test, the highest slant, and splitting bond strength among all repair mixes. The estimated two-million cycle fatigue endurance limit of Mix S (70.8%) was very similar to that was reported in literature (71%) using the traditional loading method. This study confirms the usefulness of Palmgren-Minder rule on estimating the fatigue life of repaired specimens. Additionally, the use of the novel loading regime showed the benefit of shortening the test process while producing results similar to those from using traditional loading methods. To improve the prediction accuracy, future research is required to modify the failure criteria to accommodate specimens that may not fail even when the average flexural strength is met.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Repaired Concrete under Cyclic Flexural Loading

Wang

Gupta

2021

Materials

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“…the rule proposed by Shah [33], and the rule suggested by Grzybowski and Meyer [34]. However these empirically based rules show only a limited range of validity as documented in [35]. Nonlinear damage accumulation rules for concrete fatigue behavior under tensile stresses can be found also in [36][37][38].…”

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confidence: 99%

Experimental and theoretical evidence for the load sequence effect in the compressive fatigue behavior of concrete

Baktheer

Chudoba

2021

Mater Struct

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A realistic prediction of the concrete fatigue life exposed to high-cycle loading scenarios with variable amplitudes is of utmost importance for a reliable and economically efficient design of civil engineering infrastructure for transport and energy supply. Current design codes estimate the fatigue life under variable amplitudes using the Palmgren–Miner rule, which assumes a linear scaling between lifetimes measured for uniform cyclic loading scenarios. Several experimental series conducted in the past, however, indicate that this assumption is not valid and that it may lead to unsafe design. In this paper, an experimental and theoretical investigations of the fatigue loading sequence effect in normal- and high-strength concrete behavior are presented, which confirm this observation. In particular, a test campaign with 135 cylinder specimens, including three concrete grades and six different loading scenarios has been conducted. Several response characteristics of the fatigue behavior including Wöhler curves, fatigue creep curves and evolving shapes of hysteretic loops have been evaluated. To substantiate the experimental results, a theoretical explanation of the observed sequence effect is formulated based on the assumption, that energy is dissipated uniformly within the volume of a test specimen during subcritical, compressive cyclic loading. Then, superposition of energy dissipation profiles along the lifetime measured for constant amplitudes becomes possible and a theoretical justification of the experimentally observed sequence effect can be provided. Moreover, a reverse sequence effect reported in the literature for bending fatigue of concrete can then be explained by an unevenly distributed energy dissipation over a cracked specimen. Supported by the theoretical consideration, the processed experimental data is used to validate existing fatigue life assessment rules by testing their ability to reflect the load sequence effect.

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“…The Miner linear damage accumulation method is a damage accumulation method commonly used in engineering scale. 20 In the process of durability degradation of concrete structures under the action of a complex environment, factors such as freeze-thaw, chloride erosion, carbonization, and shrinkage are equivalent to different external attacks, combined with the importance weight of each factor. The linear superposition of damage can realize the calculation of concrete durability deterioration damage, and the determination of reasonable correction coefficient is key to the establishment of the damage model, which is expressed as follows:…”

Section: A Damage Model Of Concrete Durabilitymentioning

confidence: 99%