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Impact of non-local damage formulation on chloride transport modeling in concrete
Computers & Structures ( IF 4.4 ) Pub Date : 2025-01-10 , DOI: 10.1016/j.compstruc.2025.107648
Pavel Trávníček, Jiří Němeček, Tomáš Koudelka, Jaroslav Kruis

Reinforced concrete structures, such as roads and bridges, are exposed to chloride ingress, leading to steel reinforcement corrosion and reduced service life. Accurate numerical simulations of chloride ingress must account for damage caused by loading, as higher damage increases diffusion. This paper analyzes the impact of selected damage evolution laws and non-local formulations on the diffusion coefficient. The results show significant variations in load capacity (up to 20%) and damage extent (up to 72%) depending on the chosen model and averaging technique, which affects chloride diffusion modeling. Two diffusion models—Kurumatani et al. (2017) [49] and a new model by Trávníček et al. (2024) [52]—were compared for chloride penetration, with the latter validated using experimental data from a cracked reinforced concrete beam. Both diffusion models and four non-local damage variants were assessed in a Brazilian splitting test, showing differences in chloride concentration of up to 475%. This highlights the critical impact of selecting an appropriate damage model and a particular non-local formulation based on spatial averaging.

中文翻译:


非局部损伤公式对混凝土中氯离子输运建模的影响



钢筋混凝土结构(如道路和桥梁)暴露在氯化物进入中,导致钢筋腐蚀并缩短使用寿命。氯化物进入的准确数值模拟必须考虑负载造成的损伤,因为较高的损伤会增加扩散。本文分析了选定的损伤演化规律和非局部公式对扩散系数的影响。结果显示,负载能力(高达 20%)和损伤程度(高达 72%)存在显著变化,具体取决于所选模型和平均技术,这会影响氯化物扩散建模。比较了两种扩散模型——Kurumatani et al. (2017) [49] 和 Trávníček et al. (2024) [52] 的一个新模型——氯化物渗透性,后者使用开裂钢筋混凝土梁的实验数据进行了验证。在巴西分裂测试中评估了扩散模型和四种非局部损伤变体,显示氯化物浓度差异高达 475%。这突出了选择合适的损伤模型和基于空间平均的特定非局部公式的关键影响。
更新日期:2025-01-10
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