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Quantitative modeling of thermal fatigue damage in concrete considering material–boundary interaction effects
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DOI：10.1177/10567895261473741.png)
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Abstract
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<jats:p>During the long-term service of concrete structures, repeated temperature fluctuations induce complex thermal stresses and fatigue damage within the heterogeneous concrete matrix, thereby affecting durability and structural safety. This study proposes a quantitative macro–micro coupled computational framework for evaluating temperature-induced damage in concrete under cyclic thermal loading. The improved Paris’ law was adopted to account for the growth behavior of the concrete damage factor. Validated by existing laboratory data of concrete specimens and case analysis of a concrete bridge, the spatial distribution and crack-initiation risk of internal damage in concrete structures subjected to long-term thermal cycling were analyzed. Results revealed that for every 10 °C increase in temperature amplitude, the average damage factor rises by approximately 15%. The inner wall of the main girder was identified as a high-risk zone for thermal fatigue. When a heat-reflective boundary was applied, the inner wall damage decreased by 7.14%, and the overall fatigue damage was reduced by 52.17%. To mitigate thermal fatigue cracks, a careful balance of thermal stress and mechanical performance at both the material and structural levels was identified as essential, ensuring thermal cyclic damage remains controlled throughout the concrete structure. The proposed temperature damage model and numerical approach enable the coupled prediction of damage evolution and cracking risk under varying climatic conditions. The proposed approach offers a theoretical framework for optimizing thermal insulation and assessing the durability of concrete bridges exposed to significant temperature variations.</jats:p>
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