A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental research on variable-amplitude fatigue behavior of cracked mortar after epoxy grouting
Highlights A modified Palmgren-Miner's rule for multi-step variable-amplitude fatigue tests was proposed. The fatigue failure mechanism and cumulative damage evolution of epoxy grouted mortar under variable-amplitude fatigue loading were analyzed. The fatigue life of multi-step variable amplitude fatigue can be unified with the constant amplitude fatigue life based on the equivalent stress level. The structure grouted by epoxy resin has good fatigue resistance.
Abstract This paper presents the experimental results of the fatigue behavior of cracked mortar specimens after epoxy grouting reinforcement under high-frequency variable-amplitude fatigue loading. Grouting can effectively suppress the stress concentration at the crack tip and enhance the fatigue resistance of the sample. The final failure mode of the specimen depends on the loading sequence order. We consider the equivalent coefficient and loading sequence, and the multi-step stress level can be equal to a constant value. A log-linear relationship can be obtained between the equivalent stress level and the total fatigue life for both grouted and cracked specimens. In the process of multi-stage fatigue loading, using strain as the damage parameter, it is found that the damage in each loading stage accumulates non-linearly, and the prediction using Palmgren-Miner's rule may be conservative. We propose a nonlinear damage accumulation prediction model that fully considers the loading sequence, equivalent stress level, stress ratio, and other parameters. The test results show that the model can better meet damage accumulation rules and make better prediction effects for multi-stage variable-amplitude fatigue loading.
Experimental research on variable-amplitude fatigue behavior of cracked mortar after epoxy grouting
Highlights A modified Palmgren-Miner's rule for multi-step variable-amplitude fatigue tests was proposed. The fatigue failure mechanism and cumulative damage evolution of epoxy grouted mortar under variable-amplitude fatigue loading were analyzed. The fatigue life of multi-step variable amplitude fatigue can be unified with the constant amplitude fatigue life based on the equivalent stress level. The structure grouted by epoxy resin has good fatigue resistance.
Abstract This paper presents the experimental results of the fatigue behavior of cracked mortar specimens after epoxy grouting reinforcement under high-frequency variable-amplitude fatigue loading. Grouting can effectively suppress the stress concentration at the crack tip and enhance the fatigue resistance of the sample. The final failure mode of the specimen depends on the loading sequence order. We consider the equivalent coefficient and loading sequence, and the multi-step stress level can be equal to a constant value. A log-linear relationship can be obtained between the equivalent stress level and the total fatigue life for both grouted and cracked specimens. In the process of multi-stage fatigue loading, using strain as the damage parameter, it is found that the damage in each loading stage accumulates non-linearly, and the prediction using Palmgren-Miner's rule may be conservative. We propose a nonlinear damage accumulation prediction model that fully considers the loading sequence, equivalent stress level, stress ratio, and other parameters. The test results show that the model can better meet damage accumulation rules and make better prediction effects for multi-stage variable-amplitude fatigue loading.
Experimental research on variable-amplitude fatigue behavior of cracked mortar after epoxy grouting
Wang, Zhi (author) / Qin, Wenjing (author) / Li, Long (author) / Yang, Yuxiang (author) / Lv, Haopeng (author) / Zhang, Lijuan (author)
2021-08-14
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2011