STRUCTURE

PROBLEM TO BE SOLVED: To suppress easily and effectively the concentration of strain at the longitudinal end portion of a beam member.SOLUTION: In a skeleton 1 in which the longitudinal end portions of a steel beam 10 are joined to pillar members 20, a flange portion 11 positioned at the longitudinal end portion of the steel beam 10 is provided with an expanding portion 14 which extends from the end of the flange portion 11 in the beam width direction and expands the beam width, and a plate member 15 is fixed to a web portion 12 at a position adjacent to a range where the expanding portion 14 is provided in the longitudinal direction of the beam. The end portion of the plate member 15 on the side further away from the joining portion between the steel beam 10 and the pillar member 20 in the longitudinal direction has a vertex portion 15a disposed at the center of the web portion 12 in the height direction of the beam and an outer edge portion 15b extending from the vertex portion 15a to the joining portion side in the longitudinal direction. The distance between the outer edge portion 15b and the center of the web portion 12 in the height direction of the beam becomes longer as it goes away from the vertex portion 15a.SELECTED DRAWING: Figure 1 【課題】梁部材の長手方向端部における歪みの集中を、簡単且つ効果的に抑制する。【解決手段】形鋼梁１０の長手方向端部が柱部材２０に接合された躯体１において、形鋼梁１０の長手方向端部に位置するフランジ部１１には、梁幅方向においてフランジ部１１の端から張り出して梁幅を拡張させる拡張部１４が設けられており、梁の長手方向において拡張部１４が設けられている範囲と隣り合う位置にてプレート材１５がウェブ部１２に固定されている。プレート材１５のうち、長手方向において形鋼梁１０と柱部材２０との接合箇所からより離れている側の端部は、梁の高さ方向においてウェブ部１２の中央に配置された頂点部１５ａと、長手方向において頂点部１５ａから接合箇所側に延出した外縁部１５ｂを備えており、梁の高さ方向における外縁部１５ｂとウェブ部１２の中央との距離が、頂点部１５ａから離れるほど長くなっている。【選択図】図１