Experimental Study On The Dynamic Tensile Strength Of High Strength Steel Fiber Reinforced Concrete

Steel fiber reinforced concrete is a widely used composite material with excellent performance, the research of its dynamic mechanical properties are very important to make full use of its strength, improve the design level and reduce the project cost. However, at present most of the concrete strength criterions only applies to static loads, without considering the effect of strain rate. Especially, tensile strength as an important mechanical properties of concrete, the study of its properties under multiaxial dynamic loads is very lack.Firstly, this article reviewed the static mechanical properties and static strength criteria of steel fiber reinforced concrete, then give an introduction of dynamic experimental research progress and achievements of concrete. For the strength criterion of concrete under high strain rate, this paper presents a modified model based on the classic static strength criterion of concrete. Take the Ottosen criterion and Willam-Warnke criterion for example,this article deduced theirs correction strength criterion under high strain rate, which modified by dynamic increase factor.Finally,Use the Brazilian disc specimen to realize concrete,which has different content of steel fiber, quasi-static and dynamic biaxial tension - compression test, and deduced the relationship between Brazilian disc splitting tensile strength and octahedral stress. Use the spherical specimen to realize concrete, which has different content of steel fiber,triaxial compression - tension - tension test, and the influence of strain rate and different steel fiber volume fractions on splitting tensile strength of concrete was discussed by the results.