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为了研究纤维增强混凝土(FRC)梁的受剪性能,根据桁架-拱模型理论,综合考虑了FRC的受拉作用、软化效应以及箍筋对混凝土的约束效应等影响因素,分析了FRC梁的受剪机理,提出了FRC梁受剪承载力计算公式,并对公式中的系数进行了讨论。根据搜集到的31个FRC梁受剪试验数据,采用提出的FRC梁受剪承载力计算公式进行计算,计算结果表明:计算值与试验值吻合较好,且FRC对梁受剪承载力的贡献比箍筋大。研究结果表明,提出的计算公式可以用于FRC梁的斜截面受剪承载力计算。
In order to study the shear behavior of FRC beams, considering the truss-arch model theory, considering the factors such as the tension and softening effect of FRC and the confinement effect of concrete on the stirrup, Shear mechanics, the formula of FRC beam shear capacity is proposed, and the coefficients in the formula are discussed. Based on the collected shear test data of 31 FRC beams, the formula of shear capacity of FRC beams proposed is used to calculate the results. The calculated results show that the calculated values are in good agreement with the experimental values and the contribution of FRC to beam shear capacity Bigger than stirrup. The results show that the proposed formula can be used to calculate the shear capacity of RC beams.