軸力をうける鉄骨鉄筋コンクリート部材の弾塑性曲げ変形ならびに崩壊性状に関する研究 : I.充腹十字型断面部材, 定変位振幅交番繰り返し曲げ実験

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The objective of this research is to make clear the elasto-plastic flexural deformation behavior, fracture mode and fatigue fracture criteria under cyclic bending of steel profile encased reinforced concrete beam-columns experimentally. Tests are carried out under alternately repeated cyclic bending with various constant axial loads. Fracture modes are different according to the axial load levels and deflection amplitudes. In case of lower axial load level N = 0, 1/6 N_0, fractures are caused by the tear off of flange plates for all deflection amplitudes (fracture type F). On the contrary, in case of higher axial load level AT = 2/3 N_0, fracture are caused by the reduction of moment resistance due to crashing down of concrete and the occurrences of the local buckling at the flange plates for all deflection amplitudes (fracture type B). In case of medium axial load level N = 1/3 N_0, the fracture mode is type B for larger deflection amplitudes δ_a=±30mm, ±20 mm and combined type B and F for smaller deflection amplitude δ_a= ±15 mm. All specimen except N = 0N_0 lose lateral and axial resistances at the fracture. The relationship between the deflection amplitudes and the cycles until fracture in Fig. 13 shows very clearly the approximately linear correlation in log-log scale and the influences of axial load levels and deflection amplitudes upon the low cycle fatigue limits of steel profile encased reinforced concrete beam-columns under cyclic bending.
社団法人日本建築学会の論文
1987-12-30

軸力をうける鉄骨鉄筋コンクリート部材の弾塑性曲げ変形ならびに崩壊性状に関する研究 : I.充腹十字型断面部材, 定変位振幅交番繰り返し曲げ実験

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