Abstract
In this paper the results of a research about the structural members, those connections and structural characteristics of 50 existing high rise steel buildings are summarized. The bights of those buildings are between 45m to 60m. Most of those buildings are office buildings. 80 % of the beam-to-column connections are designed as WBFW(web bolted and flange welded) type connections. 96 % of the designed ultimate bending strength of the beam-to-column connections are larger than 1.265(=1.1x1.15) 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.
