Li Anbang, Wang Hao, Li Han, Kong Deliang, Xu Shanhua
School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
State Key Laboratory of Green Building in Western China, Xi'an 710055, China.
Polymers (Basel). 2022 Jul 29;14(15):3069. doi: 10.3390/polym14153069.
In this paper, we examine the development of the estimation models of bond strength and effective bond length for a double strap joint between carbon fiber reinforced polymer (CFRP) plate and corroded steel plate. The experimental study on the bond behavior between CFRP plate and corroded steel plate is summarized first and the analytical interfacial bond-slip model for CFRP plate externally bonded to corroded steel plate is proposed. Based on the theoretical stress analysis for the CFRP plate-corroded steel plate double-lap joint, the piecewise expressions of the interfacial shear stress and the normal peel stress of the interface between CFRP plate and corroded steel plate were established. The estimation models of the bond strength and the effective bond length for the double strap joint between the CFRP plate and the corroded steel plate were consequently developed on the basis of interfacial stress distribution equations and the stress boundary conditions. The comparison between the predicted and experimental results indicated that the proposed models could be adopted to predict the bond strength and effective bond length for the CFRP plates externally bonded to corroded steel substrates with reasonable accuracy. The proposed estimation models are expected to provide meaningful references and essential data for the reliable application of CFRP strengthening system to the performance improvement of corroded steel structures.
在本文中，我们研究了碳纤维增强聚合物（CFRP）板与锈蚀钢板之间双盖板接头的粘结强度和有效粘结长度估算模型的发展。首先总结了CFRP板与锈蚀钢板之间粘结性能的试验研究，并提出了外部粘结于锈蚀钢板的CFRP板的解析界面粘结-滑移模型。基于对CFRP板-锈蚀钢板双搭接接头的理论应力分析，建立了CFRP板与锈蚀钢板界面的界面剪应力和法向剥离应力的分段表达式。基于界面应力分布方程和应力边界条件，进而建立了CFRP板与锈蚀钢板之间双盖板接头的粘结强度和有效粘结长度估算模型。预测结果与试验结果的比较表明，所提出的模型可用于合理准确地预测外部粘结于锈蚀钢基体上的CFRP板的粘结强度和有效粘结长度。所提出的估算模型有望为CFRP加固系统可靠应用于锈蚀钢结构性能改善提供有意义的参考和必要数据。
