Abstract
In the structure design, the definition of the joints had a great impact on the structure internal force distribution, thus affecting the whole structure design. In the traditional design of steel structures, the beam-column joints were always considered as completely rigid connections or ideal hinged connections, but it is usually not in accord with the practical situations. According to the existing formulas, the simplified formulas for the end moments of semi-rigid connections have been proposed, the semi-rigid connections will also be discussed. The formulas proposed in this paper are applied to the auxiliary beam-column joint design, which is part of the counterforce frame design. It is hoped that the formulas can provide a reference for the steel frame design. Keywords: semi-rigid connections, end moments, internal forces distribution, steel frame design
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