Based on the experiments of four flab beam-column joints,this paper studied the rule about the strains of the steel bars in the steel fiber reinforced concrete flab beam-column joints, analyzed the attnbution of the concrete, the shear steel har and the steel fiber in exterior and interior joint cores to the ultimate shear resistant capacity of flab beam-column joints, and proposed a calculation equation of the ultimate shear resistant capacity of the steel fiber reinforced concrete flab beam-column joints and an equation defining the minimal section dimension of the joints. A way discriminatinfl; two kinds of failure models was also given. The results of calculation correspond to the case of test. These equations proposed can be a reference in engineering design.
Keywords: flab beam-column joint; steel fiber; joint core; shear resistant capacity