水平ハンチを有する鉄骨梁端部の最大耐力と最適ハンチ長さの評価

概要

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Horizontally haunched beams are being increasingly used to prevent brittle fractures of beam flanges in the vicinity of steel beam-to-boxed-column moment-resisting connections. The design method has already been proposed by the author and used in practical design. This method can give fracture patterns and the optimum haunch length by comparing fracture strengths and local buckling strengths of the beam-end. However, the formula of local buckling strength used in the design method has recently been corrected, and a formula for strength against diagonal fracture based on von Mises's yield criterion has been proposed. This new knowledge needs to be included and verified to refine the design method. The revised design method has been applied to horizontally haunched beams tested by the author and other reseachers. The followings have thus been clarified. The formula for the diagonal fracture strength provides some conservertive result on the safe side, and the corrected local buckling strength agrees closely with the test results. Furthermore, the refined design method is reconfirmed to indicate roughly fracture patterns and optimum haunch length, except for beams with stiffeners. An equation for optimum haunch length is also proposed. The rough value of the optimum haunch length is about 20〜30% of the beam depth.
社団法人日本建築学会の論文
2002-07-30