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参照德国混凝土标准(DBV)对纤维混凝土试验梁弯曲韧性进行研究。在此基础上统计分析了钢纤维在混凝土试验梁破坏截面的分布及其对弯曲性能的影响。结果表明:对于相同掺量的钢纤维混凝土梁,纤维在破坏截面的分布有较大的离散;韧性总体上随纤维掺量的增加呈增大趋势,但也存在纤维掺量较高但截面纤维根数较低且韧性较低的试验梁;通过对统计数据进行线性回归,建立纤维掺量与单位面积纤维根数的函数关系,预测不同纤维掺量时破坏截面的纤维根数。试验表明,与纤维掺量相比,纤维分布是影响梁弯曲韧性更为直接的因素。
The flexural toughness of fiber reinforced concrete test beam was studied with reference to German Concrete Standard (DBV). Based on this, the distribution of steel fiber in the failure cross section of concrete test beam and its influence on the bending performance were statistically analyzed. The results show that for the same amount of steel fiber reinforced concrete beam, the distribution of fibers in the damaged section is relatively large. The toughness generally increases with the increase of fiber content. However, The test beam with lower root number and lower toughness was established. The linear regression of statistical data was used to establish the functional relationship between the fiber content and the root number per unit area of fiber, and to predict the fiber number of the damaged section at different fiber contents. Experiments show that, compared with the fiber content, fiber distribution is a more direct impact on the bending toughness of the beam.