COLUMN BEAM JOINT STRUCTURE

To provide a column beam joint structure capable of preventing a damage of a hinge part of a beam.SOLUTION: A column beam joint structure comprises a first steel bar 4 projecting from a column 2 at respective heights of an upper part and a lower part of a beam 3 and joined to a beam main bar 31 of the beam 3 by mechanical joints 61 and 62 at an end 34 of the beam 3, a second steel bar 5 projecting from the column 2 at respective heights below the upper first steel bar 4 and above the lower first steel bar 4 and having a part projecting from the column 2 situated at the end 34 of the beam 3 and a shear reinforcement bar 32 provided at the beam 3. The first steel bar 4 has higher strength and/or larger diameter than the beam main bar 31, intervals of arrangements of the shear reinforcement bar 32 are set to be smaller at a high density reinforcement area 35 at the beam 3 than other areas and the high density reinforcement area 35 is an area from a position apart for a distance between steel bar central axes of a central axis of the upper first steel bar 4 and a central axis of the lower first steel bar 4 to a central part of the beam 3 from a tension yield position 313 of the beam main bar 31, to a position of an end of the second steel bar 5.SELECTED DRAWING: Figure 1 【課題】梁のヒンジ部分の損傷を防止できる柱梁接合構造を提供する。【解決手段】梁３の上部および下部それぞれの高さにおいて柱２から突出し、梁３の端部３４において梁３の梁主筋３１と機械式継手６１，６２で接合される第１鉄筋４と、上側の第１鉄筋４の下方と下側の第１鉄筋４の上方それぞれの高さにおいて柱２から突出し、柱２から突出した部分が梁３の端部３４に位置する第２鉄筋５と、梁３に設けられるせん断補強筋３２と、を有し、第１鉄筋４は、梁主筋３１よりも高強度または／および太径であり、せん断補強筋３２の配筋間隔は、梁３における高密補強領域３５においてその他の領域よりも小さく設定され、高密補強領域３５は、梁主筋３１の引張降伏位置３１３から梁３の中央側に向かって上側の第１鉄筋４の中心軸と下側の第１鉄筋４の中心軸との鉄筋中心軸間距離ｊｔだけ離れた位置から、第２鉄筋５の端部の位置までの領域である。【選択図】図１