The Structural Engineer > Archive > Volume 74 (1996) > Issues > Issue 13 > SCF Design Equations for Steel Multiplanar Tubular XT-Joints
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SCF Design Equations for Steel Multiplanar Tubular XT-Joints

A parametric study of hotspot stresses in multiplanar tubular XT-joints has been conducted in which 180 finite element analyses were performed. The study covers a wide range of joint geometries under various combinations of axial forces. The results of the analyses are presented as a set of equations expressing the stress concentration factor as a function of the relevant geometric parameters for various combinations of axial forces. A typical full-size steel multiplanar XT-joint was selected for experimental testing to verify the numerical analyses. A comparison is also made between the results obtained for multiplanar tubular XT-joints and those of the corresponding uniplanar T- and X-joints. It is found that, when all the braces of the multiplanar XT-joints are loaded simultaneously, the multiplanar effect is significant. When the out-of-plane braces are not loaded, the multiplanar effect is insignifcant for small รข value when the comparison is made between the multiplanar XT-joints with uniplanar T-joints. S.P. Chiew, Professor C.K. Soh, A.K. Soh, T.C. Fung and W.M. Lee

Author(s): Chiew, S P;Soh, C K;Soh, A K;Fung, T C;Lee, W M

Keywords: joints;tubular;steel;design;stress;concentrated;finite element methods;experimental methods;testing;models;analysis;stress concentration factors