玄武岩纤维自密实高强混凝土梁抗剪承载力研究初探

Preliminary Study on the Shear Capacity of Basalt Fiber Self-compacting HighStrength Concrete Beams

文章叙述了玄武岩纤维混凝土梁抗剪性能的现有研究基础,设计并进行了以纤维体积率和纤维长度为变量的7根玄武岩纤维自密实高强混凝土梁抗剪性能试验,从梁的破坏形态和裂缝分布、荷载-跨中挠度曲线、斜截面抗剪承载力三个方面分析了玄武岩纤维高强自密实混凝土梁的抗剪性能。建立了玄武岩纤维自密实高强混凝土梁斜截面抗剪承载力的简化计算公式,应用公式对玄武岩纤维自密实高强混凝土梁斜截面抗剪承载力进行计算,分析了玄武岩纤维自密实高强混凝土梁基于极限荷载后的名义平均等效抗剪强度的剪切延性。

The paper describes the existing research foundation of the basalt fibre concrete beam shear performance,designs and carries out seven kind of basalt fibre self-compacting high-strength concrete beam shear performance tests with the fibre volume ratio and fibre length as variables.Then the shear resistance of basalt fibre high-strength self-compacting concrete beams is analysed from three aspects of beam damage form and crack distribution,load-span mid-deflection curve,and shear capacity of inclined section.A simplified formula for calculating the shear capacity of diagonal sections of basalt fibre self-compacting high-strength concrete beams is established.The formula is used to calculate the shearing capacity of diagonal sections of basalt fibre self-compacting high-strength concrete beams.Based on the nominal average equivalent shear strength,the shear ductility of basalt fibre self-compacting high-strength concrete beams is analysed.