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Multi-scale study on interfacial bond failure between normal concrete (NC) and ultra-high performance concrete (UHPC)
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2022-06-21 , DOI: 10.1016/j.jobe.2022.104808
Jiangjiang Yu , Boshan Zhang , Weizhen Chen , Hang Liu , Heng Li

It is a promising way to strengthen and repair the damaged normal concrete (NC) structure with ultra-high performance concrete (UHPC), and the interfacial performance between NC and UHPC is a critical issue. This paper aims to reveal the debonding failure performance between UHPC (repair material) and NC (substrate material) under tensile loading and shear loading. A multi-scale analysis method is established to simulate the mechanical behavior of the NC-UHPC interface, considering the complex interface geometry on the meso-scale. The failure of NC matrix is described by the elastic-plastic damage model in form of coupled gradient-enhanced damage evolution, the interface is represented by the cohesive zone model (CZM), and the UHPC is characterized by the second-order mean-field homogenization (MFH) method. After extracting the roughness characteristic parameters of the tested interfaces, the representative volume element (RVE) corresponding to the roughness is established, the load transfer and the debonding failure behavior are investigated, and the effective traction-separation law (TSL) is obtained. Finally, the tensile and the shear separation mechanisms of the NC-UHPC interface are revealed, and the effects of the roughness and strength of the interface on the macro shear and tensile strength are evaluated. Both the interface roughness and the substrate concrete strength have positive effects on the mechanical properties of the interface.



中文翻译:

普通混凝土(NC)与超高性能混凝土(UHPC)界面结合破坏的多尺度研究

用超高性能混凝土(UHPC)加固和修复受损的普通混凝土(NC)结构是一种很有前景的方法,而NC与UHPC之间的界面性能是一个关键问题。本文旨在揭示UHPC(修复材料)和NC(基材)在拉伸载荷和剪切载荷下的脱粘失效性能。考虑到细观尺度上复杂的界面几何形状,建立了一种多尺度分析方法来模拟NC-UHPC界面的力学行为。NC 矩阵的失效由弹塑性损伤模型以耦合梯度增强损伤演化的形式描述,界面由凝聚带模型(CZM),UHPC的特征是二阶平均场均质化(MFH)方法。在提取被测界面的粗糙度特征参数后,建立与粗糙度相对应的代表体积元(RVE),研究载荷传递和剥离破坏行为,得到有效牵引分离律(TSL)。最后,揭示了NC-UHPC界面的拉伸和剪切分离机制,评估了界面粗糙度和强度对宏观剪切和拉伸强度的影响。界面粗糙度和基体混凝土强度都对界面的力学性能产生积极影响。

更新日期:2022-06-24
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