In this paper the result of a research about the structural members, those connections and structural characteristics of 92 existing low and middle rise steel buildings are summarized. The structure of all those buildings are designed as pure moment resisting frames. All beam-to-column connections are designed as shop welding type rigid connections. Most of the designed ultimate bending strength of the beam joints are larger than 1.2 times of the full plastic moment of the connected beams. The ratio of the yield strength of panel zone to the plastic bending strength of connected members and the ratio of the plastic bending strength of columns to that of beams are also investigated.
