The diaphragm at beam-column connection is usually considered necessary to provide enough stiffness and resistance in moment resistant frames in which rectangular steel tube as column and H steel as beam are adopted. However, it is costly and time consumed in fabricating process. Thus a proposal of thick wall joint zone without diaphragm is put forward. In order to research the hysteretic behavior of non-diaphragm joint connecting cold-formed tube column and H-shaped beam, 5 specimens (including 1 inner diaphragm joints) are tested under hysteretic load. The joints with diverse dimension of column and beam perform in different failure modes, such as beam flange crack, beam and column wall yield, and tube wall punch failure.
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