The bonding between basalt fibre-reinforced polymer (BFRP) and concrete has a crucial effect on the durability of externally retrofitted concrete structures, because the BFRP–concrete interface is the element most vulnerable to failure. Although numerous experiments have investigated the tensile bonding strength of the FRP–concrete interface, there have been only a limited number of numerical simulations of crack propagation. Therefore, in this study, the tensile bonding strength between BFRP and concrete was analysed numerically using a cohesive zone model (CZM). To validate the numerical modelling results, experiments were conducted under different initial crack widths. To clarify the crack propagation, the representative fracture area technique was applied. According to the numerical and experimental results, the CZM is appropriate for simulating the BFRP–concrete interface. The results also indicate that specimens with no initial cracks suffer only limited cracking at the edge of the surface, whereas the specimen with an initial 10 mm crack width suffered cracking across almost all of its surface. This is due to the reduced effective bonding area of the BFRP–concrete interface.

中文翻译：

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玄武岩纤维增强聚合物与混凝土结合界面的数值分析

玄武岩纤维增强聚合物 (BFRP) 与混凝土之间的粘合对外部改造混凝土结构的耐久性具有至关重要的影响，因为 BFRP-混凝土界面是最容易失效的元素。尽管许多实验已经研究了 FRP-混凝土界面的拉伸粘合强度，但只有有限数量的裂纹扩展数值模拟。因此，在本研究中，BFRP 与混凝土之间的拉伸粘结强度使用粘性区模型 (CZM) 进行数值分析。为了验证数值模拟结果，在不同的初始裂纹宽度下进行了实验。为了阐明裂纹扩展，应用了代表性断裂区域技术。根据数值和实验结果，CZM 适用于模拟 BFRP-混凝土界面。结果还表明，没有初始裂纹的试样仅在表面边缘出现有限的裂纹，而初始裂纹宽度为 10 mm 的试样几乎整个表面都出现裂纹。这是由于 BFRP-混凝土界面的有效粘合面积减少。