梁フランジ幅がH形断面柱スチフナ補強部の降伏耐力に及ぼす影響

概要

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In wide-flange steel column-to-beam connections, transverse stiffeners are often used to prevent the local failure of columns caused by concentrated beam-flange force. It is well-known that the stiffeners work insufficiently when the beam-flange width is relatively narrow due to the stress concentration to the inner parts of the stiffeners. This paper investigates the influence of beam flange width on the connection strength. The strength formulae of the narrow beam-flange to column connections reinforced with transverse stiffeners are derived by applying the yield line theory. The relationship between the beam-flange width and the strength is examined. The strength reduction is predicted for connections with narrow beam-flanges. Six loading tests and many finite element analyses are performed for the local connection models. The load-displacement relationships and strain distributions on stiffeners and columns are monitored. The results show the validity of the strength prediction and the failure mechanisms used in deriving the strength formulae.
2007-04-30