RESEARCH ON SHEAR CAPACITY FOR CONCRETE-FILLED RECTANGULAR STEEL TUBULAR FRAME JOINT WITH INNER STRENGTHENING RINGS

摘要

Based on the analysis of stress mechanism for concrete-filled rectangular steel tubular (CFRST) frame joint,utilizing the deviator strain energy theory and concrete compression strut mechanical model,the shear bearing capacity calculation formulas for panel zone was given and compared with experimental results and the correlative formulas given by specification.It can be seen from comparison that the formulas calculating result recommended by specification is bigger than experimental results,and can not reflect the influence of axial compression ratio.The formulas calculation results proposed in this paper agrees approximately with the experimental values and can reflect the influence of axial compression ratio.Theory is perfect relatively,mechanics concept is clear,which can provide the reference to the engineering practice.