A modification method was proposed for near-surface mounted (NSM) fiber-reinforced polymer (FRP)-concrete bonded joints strength prediction models considering model uncertainty. A database consisting of 246 test records was involved. Three bonded joints strength prediction models for NSM FRP reinforcement system were selected for modification. All the three selected models have model uncertainty factors associated with input design parameters. Spearman correlation analysis was used to prove the systematic correlation of the model uncertainty factors. For each model, a regression function f was established to eliminate the systematic nonrandom part of the model uncertainty factor. Then, the model uncertainty factors could be described by random variables obeying logarithmic normal distribution. A reliability analysis using the JC method was carried out to validate the practical significance and value of model modification. This study improves the predictability of FRP NSM reinforcement systems and provides valuable references for model calibration in practical engineering.

中文翻译：

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NSM FRP-混凝土粘结节点强度模型修正方法研究

针对近表面安装 (NSM) 纤维增强聚合物 (FRP)-混凝土粘结接头强度预测模型提出了一种考虑模型不确定性的修改方法。涉及一个由 246 条测试记录组成的数据库。选择了三种 NSM FRP 加固系统的粘结接头强度预测模型进行修改。所有三个选定的模型都具有与输入设计参数相关的模型不确定性因素。采用Spearman相关分析证明模型不确定因素的系统相关性。对于每个模型，建立一个回归函数 f 来消除模型不确定因素的系统性非随机部分。然后，模型的不确定因素可以用服从对数正态分布的随机变量来描述。采用JC方法进行可靠性分析，验证了模型修正的实际意义和价值。本研究提高了FRP NSM加固系统的可预测性，为实际工程中的模型标定提供了有价值的参考。