Abstract: Based on the experiment of four RC T-shaped interior joints on the top story of a building frame under statically cyclic loading,the indexes of the earthquake-resistant performance of the joints such as crack patterns,shear strength,deformation features etc.were investigated.The experimental results showed that the shear strength of T-shaped joints is 15% less than that of extrior joints due to the affect of beam bar bond deterioration in the joints and confined effect deterioration from joint shear bars.Based on the test data,the key analysis parameters for STURT-TRUSS model proposed by Hwang,such as the height of sturt and the effective areas of joint shear bars were improved,the caculated model for evacuating the shear strength of T-shaped joints was proposed.The results from the analysis agree well with the experimental data.