HIGH TOUGHNESS RC BEAM STRUCTURE

PROBLEM TO BE SOLVED: To improve a displacement toughness ratio by arranging a compressive reinforcement on a lower side of a compression side concrete stress block of the ultimate time, the compressive reinforcement having at least the same level of material and at least the same reinforcement amount as a tension reinforcement.SOLUTION: A high toughness RC beam structure is provided with a compressive reinforcement 2 arranged on the compression side for forming an upper side Y1 of a beam along a beam axis direction X, a tension reinforcement 3 arranged on the tension side for forming a lower side Y2 of the beam along the beam axis direction X, and a plurality of hoop reinforcements 4 for surrounding the compressive reinforcement 2 and the tension reinforcement 3 from the outside by a cross section orthogonal to the beam axis direction X, and is constituted so that the compressive reinforcement 2 is arranged by the reinforcement amount or more of the tension reinforcement 3, and is positioned closer to the tension side than a concrete compressive stress area in ultimate load time positioned on the compression side of the beam. 【課題】圧縮鉄筋を引張鉄筋の同鉄筋量以上、同材料とし、終局時の圧縮側コンクリート応力ブロックの下側に配置したことにより、変位じん性率を向上させることができる。【解決手段】梁軸方向Ｘに沿って梁の上側Ｙ１をなす圧縮側に配置された圧縮鉄筋２と、梁軸方向Ｘに沿って梁の下側Ｙ２をなす引張側に配置された引張鉄筋３と、梁軸方向Ｘに直交する断面で圧縮鉄筋２及び引張鉄筋３を外側から囲む複数のフープ筋４とを備え、圧縮鉄筋２は、引張鉄筋３の鉄筋量以上で配置されるとともに、梁の圧縮側に位置する終局荷重時におけるコンクリート圧縮応力域よりも引張側に位置している構成の高じん性ＲＣ梁構造を提供する。【選択図】図１