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中文摘要：
钢纤维混凝土是在普通混凝土中均匀掺入一定量钢纤维而组成的一种多相复合材料。利用空间应力状态下的损伤统计本构方程，得出了钢纤维掺量和钢纤维几何尺寸不同时的分布参数和临界损伤值，并定性分析了钢纤维掺量和钢纤维几何尺寸对损伤变形参数的影响。研究结果表明：（1）钢纤维的掺入显著降低了混凝土的脆性，提高了混凝土的宏观平均强度；（2）分布参数m能综合反映钢纤维混凝土的脆性；其倒数1／m可以反映其延性，即反映钢纤维的增韧作用；（3）分布参数ε＊可以综合反映钢纤维}昆凝土的宏观平均强度，即可以综合反映钢纤维的增强作用；（4）钢纤维的几何尺寸（如长度、长细比）对钢纤维的增强和增韧作用有显著影响。
英文摘要：
Steel fiber reinforced concrete is a composite material composed of steel fibers and common concrete. Based on the statistical damage constitutive equations in 3-dimensional stress state, the distribution parameters and critical damage values are obtained for different mixing amounts or dimensions of steel fibers, and the influences of the mixing amount and dimension of the steel fibers on the damage deformation parameters are qualitatively analyzed. The results indicate that steel fibers reduce the brittleness of concrete, and enhance the macroscopic average intensity. The distribution parameter m can reflect the brittleness of the steel fiber reinforced concrete, and its reciprocal 1/m is an indicator of the ductility of the steel fiber reinforced concrete, i. e. , the toughening effect of the steel fibers. The distribution parameter ε＊ can synthetically reflect the macroscopic average intensity, i. e. , the reinforcing effect of the steel fibers. The dimension of the steel fibers, such as the slenderness ratio, has a prominent effect on the reinforcing and toughening effects.
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