钢纤维混凝土准静态单轴受压力学性能

采用WAW-2000型微机控制电液伺服万能试验机对钢纤维体积率（Vf）为0％～3％、基体强度为C50的钢纤维混凝土（SFRC）进行了准静态三种应变率单轴压缩试验，测出了基体混凝土和SFRC应力-应变全曲线，试验结果表明：随Vf的增加，SFRC抗压强度仅有小幅度增长，韧性则增长幅度较大；随着应变率增大，SFRC强度提高，韧性呈现下降趋势，但Vf越大，韧性下降幅度越小；SFRC的弹性模量和泊松比均是不敏感的材料参数，随Vf的提高而分别微增与微减；还推荐了适合于SFRC应力-应变曲线的数学表达式。

Quasi -static Mechanical Properties of SFRC under Uni -axial Compression

Using WAW-2000 a multifunction servo-controlled testing machine,uniaxial quasi-static compression experiments for the steel fiber reinforced concrete(SFRC) were conducted with three strain rates.The volume fraction(V_f)of SFRC ranged from 0% to 3%,and the matrix was C50 concrete.The whole stress-strain curves of matrix and SFRC were obtained,and the results showed that with the increase of V_f,the compressive strength increased slowly,while the toughness increase quickly.With the increase of the strain rate,the strength of SFRC increased,but the toughness decreased,and the more the Vf,the less decreasing of the toughness.The results also showed that the elastic modulus and Poisson''s ratio of SFRC were not sensitive material parameters,and with the increase of V_f,the former raised slightly and the latter decreased a little,respectively.A well suited numerical expression of the compressive stress-strain curve applicable to SFRC was put forward.