钢纤维混凝土准静态和冲击三轴劈拉强度的实验研究

he splitting tensile test methodology has been established for the concrete spheriform specimens with the principal stress ratio σ1:σ2:σ3=0.24:0.24:-1 in order to study the tensile-tensile-compressive tri-axial strength. With the application of universal material testing machine and split Hopkinson pressure bar, the quasi-static and dynamic spitting tensile tests have been exerted for the concrete spheriform specimens with 1% steel fiber dosage. In the quasi-static test, the average strain rate of the steel fiber reinforced concrete specimens is 0.000083 1/s and the splitting tensile strength is 0.77MPa, which is consistent with the existing papers. In high strain rate tests, the average strain rate is 170 1/s and the splitting tensile strength is 1.01MPa. Compared with the quasi-static testing results, it has shown that the splitting tensile strength of steel fiber reinforced concrete increases with the rise of strain rate. The splitting tensile test methodology for the concrete spheriform specimens established in the present paper is simple, quick and inexpensive, with the strength on the meridian plane of tension and compression in the principal stress space, which has the promotion of significance for other brittle materials.