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哪些条件影响了钢纤维的弯曲性
钢纤维的弯曲韧性进行了试验研究,从纤维掺量、纤维长径比、单位质量纤维根数和纤维在梁截面上的分布等角度分析了不同长径比的同一品质钢纤维对普通混凝土弯拉强度和弯曲韧性的影响,研究了纤维在混凝土梁受弯破坏截面上的分布规律,提出了相应的数学表达式。 此外,本文还利用不同类型钢纤维进行了钢纤维高强混凝土的抗压强度、抗剪强度、劈拉韧性和弯曲韧性试验。通过等效劈拉强度和劈拉韧度比的概念定量分析了不同类型钢纤维对纤维混凝土劈拉强度和劈拉韧性的影响；利用日本标准评价了钢纤维对高强混凝土弯曲韧性的影响。
The flexural toughness of steel fibers is studied experimentally. The effects of the same quality steel fibers with different length-diameter ratios on the flexural strength and flexural toughness of ordinary concrete are analyzed from the angles of fiber content, fiber length-diameter ratio, fiber number per unit mass and the distribution of fibers on the section of concrete beams. The distribution law of fibers on the section of flexural failure of concrete beams is studied, and the corresponding mathematical expressions are put forward. Type. In addition, the compressive strength, shear strength, splitting tensile toughness and flexural toughness of steel fiber reinforced high strength concrete are tested by using different types of steel fibers. Based on the concepts of equivalent splitting strength and splitting toughness ratio, the effects of different types of steel fibers on splitting strength and splitting toughness of fiber reinforced concrete are quantitatively analyzed, and the effects of steel fibers on flexural toughness of high strength concrete are evaluated by Japanese standards.
普通混凝土的弯拉强度随纤维掺量的增加而增加,当纤维掺量为60kg／m~3时,钢纤维对高强混凝土的弯拉强度的影响较为显著。不同类型的纤维,对纤维混凝土的增韧机理不同,产生的增韧效果也有差异。纤维高强混凝土的抗剪强度随纤维掺量的增加而增大。劈拉荷载—位移曲线可以较好的描述纤维的增韧效果。针对不同的位移引入的等效劈拉强度中,大小表征了混凝土基体开裂后纤维抑制裂缝扩展的能力。可以描述纤维混凝土劈拉荷载—位移曲线的饱满程度；而f_(eq2)则可反映了纤维混凝土在大变形时纤维混凝土残余强度的大小；三者可以综合的反映纤维对高强混凝土劈拉韧性的影响。基于劈拉韧性提出的劈拉韧度比,针对本文所研究的纤维,得到的数值可以为纤维混凝土的设计提供参考。端部弯钩型纤维高强混凝土的荷载—位移曲线饱满,增韧效果明显。
The flexural-tensile strength of ordinary concrete increases with the increase of fiber content. When the fiber content is 60kg/m~3, the influence of steel fiber on the flexural-tensile strength of high-strength concrete is more significant. Different types of fibers have different toughening mechanisms and different toughening effects on fiber reinforced concrete. The shear strength of fiber reinforced high strength concrete increases with the increase of fiber content. The splitting load-displacement curve can better describe the toughening effect of fibers. Among the equivalent splitting tensile strength introduced by different displacements, the size of the fiber indicates the ability tongdiaof.71ix.comtongdiaoy.71ix.com tongdiaog.71ix.comtongzhong.71ix.comrenwu.71ix.comtongdiaor.71ix.comof restraining crack propagation after cracking of concrete matrix. It can describe the fullness of splitting tensile load-displacement curve of fiber reinforced concrete, and f_ (eq2) can reflect the residual strength of fiber reinforced concrete in large deformation, and the three can reflect the influence of fiber on splitting tensile toughness of high strength concrete synthetically. Based on the splitting toughness ratio, the numerical value of the splitting toughness ratio can provide reference for the design of fiber reinforced concrete. The load-displacement curves of end-hook-type fiber reinforced high-strength concrete are full and the toughening effect is obvious.
The flexural toughness of steel fibers is studied experimentally. The effects of the same quality steel fibers with different length-diameter ratios on the flexural strength and flexural toughness of ordinary concrete are analyzed from the angles of fiber content, fiber length-diameter ratio, fiber number per unit mass and the distribution of fibers on the section of concrete beams. The distribution law of fibers on the section of flexural failure of concrete beams is studied, and the corresponding mathematical expressions are put forward. Type. In addition, the compressive strength, shear strength, splitting tensile toughness and flexural toughness of steel fiber reinforced high strength concrete are tested by using different types of steel fibers. Based on the concepts of equivalent splitting strength and splitting toughness ratio, the effects of different types of steel fibers on splitting strength and splitting toughness of fiber reinforced concrete are quantitatively analyzed, and the effects of steel fibers on flexural toughness of high strength concrete are evaluated by Japanese standards.
普通混凝土的弯拉强度随纤维掺量的增加而增加,当纤维掺量为60kg／m~3时,钢纤维对高强混凝土的弯拉强度的影响较为显著。不同类型的纤维,对纤维混凝土的增韧机理不同,产生的增韧效果也有差异。纤维高强混凝土的抗剪强度随纤维掺量的增加而增大。劈拉荷载—位移曲线可以较好的描述纤维的增韧效果。针对不同的位移引入的等效劈拉强度中,大小表征了混凝土基体开裂后纤维抑制裂缝扩展的能力。可以描述纤维混凝土劈拉荷载—位移曲线的饱满程度；而f_(eq2)则可反映了纤维混凝土在大变形时纤维混凝土残余强度的大小；三者可以综合的反映纤维对高强混凝土劈拉韧性的影响。基于劈拉韧性提出的劈拉韧度比,针对本文所研究的纤维,得到的数值可以为纤维混凝土的设计提供参考。端部弯钩型纤维高强混凝土的荷载—位移曲线饱满,增韧效果明显。
The flexural-tensile strength of ordinary concrete increases with the increase of fiber content. When the fiber content is 60kg/m~3, the influence of steel fiber on the flexural-tensile strength of high-strength concrete is more significant. Different types of fibers have different toughening mechanisms and different toughening effects on fiber reinforced concrete. The shear strength of fiber reinforced high strength concrete increases with the increase of fiber content. The splitting load-displacement curve can better describe the toughening effect of fibers. Among the equivalent splitting tensile strength introduced by different displacements, the size of the fiber indicates the ability tongdiaof.71ix.comtongdiaoy.71ix.com tongdiaog.71ix.comtongzhong.71ix.comrenwu.71ix.comtongdiaor.71ix.comof restraining crack propagation after cracking of concrete matrix. It can describe the fullness of splitting tensile load-displacement curve of fiber reinforced concrete, and f_ (eq2) can reflect the residual strength of fiber reinforced concrete in large deformation, and the three can reflect the influence of fiber on splitting tensile toughness of high strength concrete synthetically. Based on the splitting toughness ratio, the numerical value of the splitting toughness ratio can provide reference for the design of fiber reinforced concrete. The load-displacement curves of end-hook-type fiber reinforced high-strength concrete are full and the toughening effect is obvious.
