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进行了一百多根包括5种不同直径8 mm、10 mm、12 mm、16 mm、20 mm的GFRP筋的拉伸试验,测得了GFRP筋的极限抗拉强度和弹性模量等参数并做了回归分析。以试验结果数据为基础,提出了三参数Weibull概率分布模型,完成了模型参数拟合,将试验结果数据、Weibull分布模型和正态分布模型进行了比较,表明GFRP筋抗拉强度分布特性用Weibull分布描述比用正态分布描述会更为精确。最后,讨论了GFRP筋抗拉强度与有效体积之间的关系,得出不同直径GFRP筋抗拉强度标准值计算公式,为GFRP筋抗拉强度标准值的选取提供理论依据。
The tensile test of more than 100 GFRP bars with 5 different diameters of 8 mm, 10 mm, 12 mm, 16 mm and 20 mm was carried out. The ultimate tensile strength and modulus of elasticity of the GFRP bars were measured and made Regression analysis. Based on the experimental data, a three-parameter Weibull probability distribution model is proposed and the model parameters fitting is completed. The experimental data, Weibull distribution model and normal distribution model are compared. It is shown that the distribution of tensile strength of GFRP tendons is expressed by Weibull The description of the distribution is more accurate than the description of the normal distribution. Finally, the relationship between the tensile strength and the effective volume of GFRP tendons is discussed, and the formulas for calculating the standard values of tensile strength of GFRP tendons with different diameters are obtained, which provides a theoretical basis for selecting the standard value of tensile strength of GFRP tendons.