Guo Xinyan, Wu Zuodong, Yang Yi, Bai Jiahao, Zhou Qianziyang
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2022 Jun 13;15(12):4187. doi: 10.3390/ma15124187.
The bonding interface between the CFRP and the steel plate is the weak link of CFRP-strengthened steel structures. This paper studies the bond-slip relationship of the CFRP-steel interface by experiments and numerical tests. First, a series of double-strap experiments on a CFRP-strengthened steel plate are carried out. The results show that the maximum shear stress of the bonding interface of the Q345B specimen is larger than that of the X100 specimen. The initial slip and maximum slip become larger as the thickness of the bonding interface becomes larger. Finite element analysis of the above tests is carried out; we introduce the maximum stress criterion to simulate the bonding interface, which assumes that when the nominal stress of the material reaches the maximum nominal stress of damage, the material begins to damage. The FE model established has proved very effective for analyzing the bond characteristics of CFRP-strengthened steel plates. Finally, a verification test was carried out, using an FE analysis to verify the accuracy of the modified equations; the results prove that the results of the modified equations are in good agreement with the numerical results and experiment results, which verifies the effectiveness of the equations.
碳纤维增强复合材料（CFRP）与钢板之间的粘结界面是CFRP加固钢结构的薄弱环节。本文通过试验和数值模拟研究了CFRP与钢材界面的粘结-滑移关系。首先，对CFRP加固钢板进行了一系列双条带试验。结果表明，Q345B试件粘结界面的最大剪应力大于X100试件。随着粘结界面厚度的增加，初始滑移和最大滑移增大。对上述试验进行了有限元分析；引入最大应力准则来模拟粘结界面，该准则假设当材料的名义应力达到损伤的最大名义应力时，材料开始损伤。所建立的有限元模型已证明对分析CFRP加固钢板的粘结特性非常有效。最后，进行了验证试验，利用有限元分析验证修正方程的准确性；结果证明修正方程的结果与数值结果和试验结果吻合良好，验证了方程的有效性。
