DESIGN METHOD OF HYBRID BEAM

To provide a design method of a hybrid beam applicable even when the embedded length of a steel frame at the end of the SRC beam of a steel beam is less than 2.5 times the beam depth of the steel beam.SOLUTION: When calculating the allowable shear stress during long-term loading on an SRC beam structure 15 with the beam end of a steel beam 14 constituted of a steel frame 12 is buried in a reinforced concrete part 13, considering the residual crack width of the SRC beam structure 15, the calculated value is multiplied by a reduction coefficient β corresponding to the ratio of the embedded length of the steel frame 12 in the SRC beam structure 15 to the beam depth of the steel beam 12, with the SRC beam structure 15 as an RC member.SELECTED DRAWING: Figure 2 【課題】鉄骨梁のＳＲＣ造の梁端部への鉄骨の埋め込み長さが鉄骨梁の梁せいの２．５倍未満である場合にも適用することが可能なハイブリッド梁の設計方法を提供する。【解決手段】鉄骨１２からなる鉄骨梁１４の梁端部が鉄筋コンクリート部１３に埋設して構成されるＳＲＣ造梁部１５の長期荷重時の許容せん断応力を算定する際、ＳＲＣ造梁部１５の残留ひび割れ幅を考慮して、ＳＲＣ造梁部１５への鉄骨１２の埋め込み長さの鉄骨梁１２の梁せいに対する比率に応じた低減係数βを、ＳＲＣ造梁部１５をＲＣ部材として求めた算定値に乗じる。【選択図】図２