Abstract The present study pertains to the linear multiple regression analyses on a database of 185 hinged-beam experiments on FRP bars. The database was compiled from 51 tests conducted within the scope of the present study and 134 tests conducted by previous researchers. Bond strength and development length equations, taking different types of FRP bars and surface finishes into account, were developed and the estimates from the proposed equations were compared to the estimates from the respective equations of various international FRP-reinforced concrete codes. The proposed equations, addressing all kinds of FRP bars and surface finishes, were shown to be in much closer agreement with the experimental results compared to all previous equations according to different statistical evaluation criteria, i.e. the Coefficient of Determination, Root Mean Square Error and Mean Absolute Percentage Error. The code equations were established to yield to exteremely over-conservative and non-economical results in all types of FRP bars with different surface textures.

中文翻译：

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嵌入混凝土中的 FRP 钢筋的展开长度和粘结强度方程

摘要 本研究涉及对 FRP 钢筋上 185 个铰链梁实验数据库的线性多元回归分析。该数据库由本研究范围内进行的 51 项测试和以前研究人员进行的 134 项测试汇编而成。结合强度和发展长度方程，考虑到不同类型的 FRP 钢筋和表面光洁度，被开发出来，并将所提出的方程的估计值与各种国际 FRP 钢筋混凝土规范的相应方程的估计值进行比较。根据不同的统计评估标准，即确定系数，与所有先前的方程相比，所提出的方程，解决了各种 FRP 钢筋和表面光洁度，显示出与实验结果更加一致，均方根误差和平均绝对百分比误差。建立代码方程是为了在具有不同表面纹理的所有类型的 FRP 钢筋中产生极端过度保守和不经济的结果。