日本の木造建築構法の中に古くから存在する追掛け大栓継ぎは、現在でも特に長い梁を設ける場合などに多用される。そのような部位は継ぎ手を設けない場合に比べて部材性能が低いことが自明であるため、構造設計においては各応力度に対する検討が必要であり、安全な建築物の設計のためには、部材性能を終局まで評価する手法を確立しておくことが重要である。%The traditional wooden joint "Okkake-daisen-tsugi" present since ancient times in Japan, are widely used in these days. Experimental and analytical research on "Okkake-daisen-tsugi" has been conducted for a long time, but the design formulas for the rotational resistance has not yet been established In this study, design formulas for rotational stiffness, yield strength and ultimate deformation angle were proposed. In addition, calculated value by the design formula was compared with the results of the bending test of beam with "Okkake-daisen-tsugi". As a result, the design formulas were found to be capable of evaluating the rotational resistance performance on the safe side.
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