鋼断面への初期軸力が角形CFT柱の曲げ耐力に及ぼす影響

摘要

During constructing concrete-filled steel tubular (CFST) structures, steel frame work is built prior to filling of concrete into the tube. Therefore, the steel portion of CFST section has already been loaded by some axial load before composite column section forms. However, when experiment/calculation is conducted and/or design flexural strength is evaluated, the axial load of steel portion, loaded ahead of filling of concrete, is not considered,To estimate the flexural strength of CFST Beam-columns considering the pre-loaded axial load in steel section is valuable and desired by the structural engineers.In this paper, the moment-curvature relationship has been calculated using Finite Fiber Method and the influence of the initial axial load of steel portion on the flexural strength of CFST section has been discussed.%本論では，ファイバ一法により角形CFTの断面解析を行い，鋼部分のみに初期軸力を考慮した場合のCFT柱の曲げ耐力と履歴挙動について調べた.鋼断面の初期負担軸力が履歴挙動に与える影響について検討を行った.得られた知見を以下に示す.ただし，本論の解析結果は限られた変数によるものであり，一般的な見解とするには更なる検討が必要である.