REINFORCEMENT STRUCTURE AND METHOD FOR END PART OF REINFORCED CONCRETE BEAM WITH OPENING

• Main Authors: NISHIMURA KATSUHISA, YONEZAWA KENJI
• Format: Patent
• Language: English; Japanese
• Published: 22.06.2015
• Subjects: BUILDING; BUILDING MATERIALS; FIXED CONSTRUCTIONS; STRUCTURAL ELEMENTS

PROBLEM TO BE SOLVED: To maintain deformability after flexural yielding for main reinforcements of a reinforced concrete beam whose end part has an opening, without employing large-scale reinforcement for the opening.SOLUTION: A reinforcement structure is provided for reinforcing an end part of a reinforced concrete beam 10, specifically the end part that is joined with a concrete column 12 and has an opening 16. The structure has reinforcing bars 20 and 22 arranged around the opening 16, for reinforcing the area around the opening 16, and at the same time, anchored to the reinforced concrete column 12, for flexural reinforcement of the end part of the reinforced concrete beam 10. The strength of the reinforcing bars 20 and 22 is set so that flexural yielding of the reinforced concrete beam 10 occurs at a first yielding position M1 at the boundary between the reinforced concrete beam 10 and the reinforced concrete column 12, and at a second yielding position M2 at a location closer to the center in the axial direction of the reinforced concrete beam 12 than the reinforcing bars 20 and 22. 【課題】大掛かりな開口補強を要することなく、端部に開口が設けられた鉄筋コンクリート梁の梁主筋の曲げ降伏後の変形性能を確保する。【解決手段】コンクリート柱１２に接合された端部に開口１６が設けられた鉄筋コンクリート梁１０の当該端部の補強構造であって、開口１６の周囲に配筋されて開口１６の周囲を補強すると共に、鉄筋コンクリート柱１２に定着されて鉄筋コンクリート梁１０の端部の曲げ補強をする補強筋２０、２２を備える。鉄筋コンクリート梁１０の曲げ降伏が、鉄筋コンクリート梁１０と鉄筋コンクリート柱１２との境界に位置する第１の降伏箇所Ｍ１と、補強筋２０、２２よりも鉄筋コンクリート梁１２の材軸方向中央側に位置する第２の降伏箇所Ｍ２とで生じるように、補強筋２０、２２の強度が設定されている。【選択図】図３