Abstract
In the design of present electric transmission steel tube towers, the joints have the form of a gusset plate-steel pipe joint. Design strength formula considers the axial force applied to the steel pipe and the moment transmitted from the gusset plate. However, under actual conditions, in addition to the axial force and the moment, a shear force is also applied, and the current design strength formula does not reflect this. In particular, when an externally eccentric joint is adopted, only the shear force and the axial force are applied to the tube wall of the joint. This study examined how three parameters, axial force, shear force, and moment, affected the ultimate strength of the joints, through finite element analyses of the joints. From the ultimate strength of the joints estimated using the analysis results, an interaction formula of axial force-moment, axial force-shear force, and shear force-moment was derived, and a joint yield strength formula considering the shear force and moment was provided.
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