Abstract

Info

Title:: Comprehensive Failure Model of Yield Line and Punching Shear for Rectangular Steel Tube Joint

Author(s):: LIU Yong-jian; JIANG Lei; XIONG Zhi-hua; School of Highway, Chang’an University

Keywords:: rectangular steel tube joint; yield line model; punching shear model; failure mode; width ratio of branch member to chord member; application scope; bearing capacity of joint

Abstract:: Based on the yield line and punching shear model, the application scope of the width ratio β of branch member to chord member was theoretically analyzed when the two failure modes of the rectangular tube-tube joint and the plate-tube joint happened. The rationality of application scope of the width ratio of branch member to chord member proposed in CIDECT specification was discussed. On the basis, reasonably considering the change of stiffness along branch perimeter, the regions where yield line and punching shear probably occurred were studied, and the bearing capacity calculation method of the comprehensive failure model of yield line and punching shear was proposed. The calculated results of the proposed formula were compared with the experimental results and the calculation formula of CIDECT specification. The results show that the calculated results are in good agreement with the test results. When β<0.85, the formula of CIDECT underestimates the bearing capacity of joint, and when 0.85<β<1-1/γ(2γ is the width to thickness ratio of chord member ), the formula of CIDECT overestimates the bearing capacity of joint.