Abstract: Ten specimens of interior joints of beams with different depth were tested under reversed cyclic loading. The experimental study focused on the failure characteristics and failure process of interior joints. Based on the experimental study, a simplified analytical model for the equivalent joint core of the interior joint under the combined actions of axial force and shear was established and the shear stress versus shear angle relationship of the equivalent joint core was calculated by using equilibrium equations, kinematics equations and physical equations. Good agreement between experimental results and prediction results was observed.