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Coupled lattice discrete particle model for the simulation of water and chloride transport in cracked concrete members
Computer-Aided Civil and Infrastructure Engineering ( IF 8.5 ) Pub Date : 2024-11-30 , DOI: 10.1111/mice.13385
Yingbo Zhu, Dongge Jia, John C. Brigham, Alessandro Fascetti

A novel coupled mechanical and mass transport lattice discrete particle model is developed to quantitatively assess the impact of cracks on the mass transport properties in concrete members subjected to short‐ and long‐term loading conditions. In the developed approach, two sets of dual lattice networks are generated: one to resolve the mechanical response and another for mass transport analysis. The cracks simulated by the mechanical lattice are mapped onto the transport elements to investigate the effect of cracks on the global transport properties in concrete members. A new quantitative relationship is proposed for the estimation of the diffusion coefficient based on local crack information, and the developed model is capable of describing both convection and diffusion mechanisms. Moreover, creep behavior is incorporated to account for the influence of cracks induced by long‐term loading conditions. Numerical results, in the form of dynamic changes in cumulative water and chloride contents in concrete members under tension, compression, and bending with various stress levels show remarkable accuracy when compared to available experimental observations. The developed model provides an effective means for incorporating mesoscale information in simulations of water and chloride transport in concrete members under varying short‐ and long‐term loading conditions.

中文翻译:


耦合晶格离散粒子模型,用于模拟开裂混凝土构件中水和氯化物的传递



开发了一种新的耦合机械和质量传递晶格离散粒子模型,用于定量评估裂缝对承受短期和长期载荷条件下混凝土构件质量传递性能的影响。在开发的方法中,生成了两组双晶格网络:一组用于解决机械响应,另一组用于质量传递分析。由机械晶格模拟的裂缝被映射到传递单元上,以研究裂缝对混凝土杆件中整体传递特性的影响。提出了一种新的定量关系式,用于基于局部裂纹信息的扩散系数估计,所开发的模型能够描述对流和扩散机制。此外,还考虑了蠕变行为,以解释长期载荷条件引起的裂纹的影响。与现有的实验观测值相比,在不同应力水平下,混凝土构件中累积水和氯化物含量的动态变化形式的数值结果显示出显着的准确性。开发的模型提供了一种有效的方法,可以将介尺度信息纳入混凝土构件中水和氯化物传输的模拟中,这些材料在不同短期和长期载荷条件下。
更新日期:2024-11-30
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