A new empirical model for the prediction of bond strength between corrosion-cracked concrete and FRP sheets is proposed in this work. The model considers the impact of concrete-cracking level as well as the geometric characteristics of FRP sheets. Experimental data (from tests on reinforced concrete blocks underwent varying corrosion levels before attached to carbon FRP (CFRP) sheets at variable bond lengths and widths) is employed in the empirical modeling. Corrosion-induced cracks at widths of about 0.2–0.9 mm lead to reductions in bond strength and slippage at failure at ranges of 25–44% and 18–68%, respectively. The developed statistical model captures the correct trend for bond stress–slip relationship and precisely predicts bond characteristics between corroding concrete and CFRP sheets in terms of key parameters. The degradation parameters (incorporated in this model) confirmed those provided by the ACI committee 440 at ranges of 0.66–0.86 for bond strength and 0.63–0.89 for slip at ultimate bond stress. The prediction accuracy of the present model of published data shows the highest when compared with that of well-known published models.

中文翻译：

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腐蚀开裂混凝土和复合板之间的粘结建模

在这项工作中提出了一种新的经验模型，用于预测腐蚀开裂混凝土和 FRP 板之间的结合强度。该模型考虑了混凝土开裂水平的影响以及 FRP 板的几何特征。实验数据（来自钢筋混凝土砌块的测试，在以可变的粘合长度和宽度连接到碳 FRP (CFRP) 板之前，经历了不同的腐蚀水平）用于经验建模。宽度约为 0.2-0.9 毫米的腐蚀引起的裂纹导致粘结强度和失效时的滑移分别降低 25-44% 和 18-68%。开发的统计模型捕捉到粘结应力-滑移关系的正确趋势，并根据关键参数精确预测腐蚀混凝土和 CFRP 板之间的粘结特性。退化参数（包含在该模型中）证实了 ACI 委员会 440 提供的参数，在极限粘合应力下，粘合强度范围为 0.66-0.86，滑动范围为 0.63-0.89。与众所周知的已发布模型相比，本模型对已发布数据的预测精度最高。