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钢纤维混凝土的力学强度
1.1 钢纤维混凝土的力学强度 1.1 the mechanical strength of steel fiber reinforced concrete 1.1.1 抗压强度 1.1.1 compressive strength 钢纤维混凝土虽受压强度增加不明显，但受压韧性却大幅度提高了。这是由于钢纤维的存在，增大了试件的压缩变形，提高了受压破坏时的韧性。从宏观上呈现，钢纤维混凝土受压破坏时，没有明显的碎块或崩落，仍保持这整体性。 Although compressive strength of steel fiber reinforced concrete increase is not obvious, but compressive toughness increased significantly. This is due to the presence of steel fiber, increase the compressive deformation of the specimens, improved the compression damage when toughness. Presented from macro, the steel fiber reinforced concrete compression damage, there is no clear debris or caving, still keep the integrity. 1.1.2 抗剪强度 1.1.2 shear strength 钢纤维混凝土具有优异的抗剪性能，对提高钢筋混凝土结构抗剪能力有重要意义。通常在钢筋混凝土的构件中，其抗剪承载力主要靠箍筋和弯起钢筋承担，这些筋多了，不仅要提高工程投资，而且施工很不方便，尤其对薄壁、抗震结构和复杂形状的特种结构，问题则尤为突出。因此采用钢纤维混凝土是提高结构抗剪能力的有效途径。 Steel fiber concrete has excellent shear performance, to improve the shear capacity of reinforced concrete structures is important. Usually in reinforced concrete member, the shear bearing capacity is mainly by stirrup and bent up bar, the bar is much, not only to improve the engineering investment, and the construction is not very convenient, especially for thin wall, seismic structure and special structure of complex shapes, problem is particularly prominent. So the steel fiber reinforced concrete is an effective way to improve the structure of shear capacity. 1.1.3 抗弯强度 1.1.3 bending strength 钢纤维混凝土的抗弯强度，随着纤维掺量的增加而提高。钢纤维混凝土等级提高，使抗弯强度提高明显。在弯曲荷载作用下，钢纤维混凝土受拉区开裂，中性轴向上移，受拉区仍有部分纤维与基材的粘结力承受拉力，增加韧性，提高了混凝土的抗弯强度。而普通混凝土则很快发生断裂，以致脆性破坏。 Flexural strength of steel fiber reinforced concrete, with the increase of fiber content and improve. Steel fiber reinforced concrete level, make the bending strength increased significantly. Under bending load, the tension zone of the steel fiber reinforced concrete crack, the neutral axis moving upward, tensile area there are still part of the fiber and base material of cohesive force under tension, increase the toughness, improve the flexural strength of concrete. While ordinary concrete break soon, so that the brittle failure. 1.2 钢纤维混凝土的韧性和抗裂性 1.2 the toughness of the steel fiber reinforced concrete and crack resistance 韧性是在材料受压破坏前吸收能量的性质。抗裂性是指钢纤维在脆性混凝土基体中减少裂缝和阻滞裂缝进一步发展的性质。钢纤维混凝土具有很好的韧性和抗裂性。钢纤维混凝土的韧性随着钢纤维数量的增加而大幅度提高，同时与纤维和基材的粘结力有关。基材强度提高，纤维混凝土的韧性也相应提高。 Toughness is the nature of the energy absorption before compression of material damage. Crack resistance refers to the steel fiber in the brittleness of concrete matrix to reduce cracks and block the further development of the fracture properties. Steel fiber reinforced concrete has good toughness and crack resistance. The toughness of the steel fiber reinforced concrete increases with the increase in the number of steel fiber, the cohesive force of the fiber and base material, at the same time. Base material strength, fiber concrete toughness also increase accordingly. 1.3 钢纤维混凝土的抗冲击性能 1.3 impact resistant properties of steel fiber reinforced concrete
