钢纤维混凝土抗拉性能试验研究

研究了钢纤维体积率、钢纤维长径比、钢纤维类型对钢纤维混凝土劈裂抗拉强度、轴心抗拉强度及轴心受拉应力-应变全曲线的影响规律。试验采用两端埋设钢筋的变截面轴心受拉试件并在普通万能试验机上加辅助刚性架,进行钢纤维混凝土轴心受拉应力-应变全曲线测试。研究表明,随着钢纤维体积率、长径比的增大,钢纤维混凝土劈裂抗拉强度、轴心抗拉强度呈线性增大规律。采用设计的试验装置可测得钢纤维混凝土轴心受拉应力-应变全曲线,分析了纤维掺量和基体混凝土强度对轴心受拉应力-应变全曲线的影响规律。根据试验数据分析,提出了钢纤维混凝土轴心抗拉强度与劈裂抗拉强度间的关系式,提出了钢纤维混凝土轴心受拉应力-应变全曲线的解析表达式。

Experimental study on the tensile performance of steel fiber reinforced concrete

The effects of steel fiber volumetric ratio,steel fiber slenderness ratio and steel fiber type on the splitting tensile strength,axial tensile strength and axial tensile stress-strain curve of steel fiber reinforced concrete(SFRC) are studied.In axial tensile stress-strain SFRC tests,axial tensile specimens of various cross-sections with embedded end reinforcements are tested in an ordinary universal test machine with a subsidiary rigid frame added.The results indicate that both the splitting tensile strength and the axial tensile strength of SFRC increase with the increasing of the steel fiber volumetric ratio and the steel fiber slenderness ratio.Axial tensile stress-strain curves of SFRC are obtained.The effects of the steel fiber volumetric ratio and the concrete strength on the axial tensile stress-strain curve are studied.A relationship between the axial tensile strength and the splitting tensile strength of SFRC is proposed.An analytical formula for the axial tensile stress-strain relationship of SFRC is proposed.