Multiscale diffusion–thermal–mechanical cohesive zone model for concrete
Multiscale diffusion–thermal–mechanical cohesive zone model for concrete
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DOI：
10.1007/s00466-015-1149-y
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发表时间：
2015-05
影响因子：
4.1
通讯作者：
T. Wu;P. Wriggers
中科院分区：
文献类型：
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作者：
T. Wu;P. Wriggers
本文建立了一个可靠的模型来描述由于水泥浆体和骨料之间的界面过渡区（ITZ）对混凝土的力学性能，热性能和扩散性能的影响。混凝土的细观结构由随机分布的骨料和代表界面区的零厚度界面单元组成。在这项工作中，内聚区模型（CZM）被用来模拟剥离之间的水泥浆体和骨料界面。此外，在CZM的牵引分离法结合微机械驱动的热通量分离关系和扩散通量分离关系的开发，从而能够描述跨越粘性裂纹的温度跳跃和湿度跳跃。
The present work establishes a reliable model to describe the influence due to the interfacial transition zone (ITZ) between cement paste and aggregates on the mechanical, thermal and diffusion properties of concrete. The mesostructure of concrete consists of aggregates with a random distribution embedded in the cement paste as well as the interface elements with zero-thickness representing the ITZ. In this work, the cohesive zone model (CZM) is used to model the debonding at the ITZ between cement paste and aggregates. Furthermore, a traction-separation law in CZM combined with micromechanically motivated thermal flux-separation relation and diffusion flux-separation relation is developed, thus enabling to describe the temperature jump and humidity jump across the cohesive crack.