Calculation method of shaft tensile initial crack strength of steel fiber concrete

steel fiber concrete;  Shaft tensile initial crack strength;  Calculation method

The initial axial tensile strength of steel fiber concrete is an important index for determining the crack resistance of steel fiber concrete, and it is also an index for indirectly measuring other mechanical properties of steel fiber concrete. Through the analysis of the axial tensile test results of steel fiber concrete, the effects of steel fiber shape and volume ratio and concrete strength grade on the initial crack strength of steel fiber concrete shaft tensile were studied. The results show that the initial tensile cracking strength of concrete shaft increases with the increase of steel fiber volume rate and the increase of concrete strength grade, respectively. Finally, the calculation model of the axial tensile initial crack strength of steel fiber concrete is established, and the calculation formula of the axial initial crack strength of steel fiber concrete is proposed for the revision of China’s < steel fiber concrete design and construction regulations> as well as engineering design and construction reference.