中文摘要：

考虑纤维种类、长径比、体积掺量3个主要因素，设计制作34组纤维混凝土试件，通过轴心抗拉试验，研究钢一聚丙烯混杂纤维混凝土轴心抗拉性能，重点分析纤维掺量的影响．结果表明，与相同配合比的基体混凝土相比，混杂纤维混凝土的轴心抗拉强度和变形能力均明显提高，其平均提高幅度分别为：初裂强度22．9%、峰值强度46．3％、初裂应变41．6％、峰值应变u8％．钢纤维掺量的增加能大幅提高峰值强度和峰值应变，聚丙烯纤维掺量的增加能有效提高初裂强度和初裂应变．基于试验结果，提出了关于纤维掺量的钢一聚丙烯混杂纤维混凝土轴心抗拉强度的计算公式，可供工程设计参考．

英文摘要：

In consideration of three major factors of types, aspect ratio and volume ratio of fibers, 34 bat- ches specimens were poured. Axial tensile test was conducted to study tensile properties of hybrid fiber re- inforced concrete; and focusing on the effect of fiber content on the properties. Results of the test manifest that both strength and deformability of hybrid fiber reinforced concrete are significantly improved com- pared to matrix concrete with the same mixing proportion. The average increasing amplitudes are as fol- lows： for initial cracking strength is 22.9%; for peak strength is 46.3%; for initial cracking strain is 41.6% ; for peak strain is 118%. The increasing of steel fiber content can considerably improve the peak strength and strain the increasing of polypropylene fiber content can improve the initial cracking strength and strain. Computing formulas for fiber content affect on axial tensile properties of hybrid fiber reinforced concrete are presented, so as to provide reference for construction design.