軸力,曲げ及び剪断力をうける鉄筋コンクリート柱の繰返し破壊実験

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  • Tests on the reinforced concrete columns under combined loading
  • ジクリョク , マゲ オヨビセンダンリョク オ ウケル テッキン コンクリート チュウ ノ クリカエシ ハカイ ジッケン

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This paper presents the results of a series of reinforced concrete column test under new type of combined loading. The test procedure is as follows; the specimen is set up vertically and loaded with constant axial force N(σ_0=N/A=40kg/cm^2 or 100kg/cm^2) and the lateral load (H) is applied at the center of its height (span length l=80cm). The specimen has 15 by 15cm cross section and has longitudinal reinforcement of p_t-p_c≑0.5% and the stirrup of 5 or 10cm spacing. Summing up the results of this tests, it found that: 1) The column subjected th σ_0=40kg/cm^2 has very rich ductility and behaves just like the beams subjected to bending moment. For one way loading about 1/20 and 1/10 of the maximum deformation R(2δ/l) are obtained for the specimens with stirrups of 10cm spacing and 5cm spacing respectively, and for alternate loading about 1/40 and 1/20 are obtained for the specimens with stirrups of 10cm spacing and 5cm spacing respectively. 2) The column subjected to σ_0=100kg/cm^2 has poor ductility. In this case the max. deformation R for each loading condition and spacing of stirrups is obtaind to be about half or less than it of that in case of σ_0=40kg/cm^2. 3) In case of σ_0=40kg/cm^2 the max. lateral load H for alternate loading is about 90% of that for one way loading, while it is about 80% in case of σ_0=100kg/cm^2. 4) Stirrups are quite effective to add more ductility to the columns subjected to combined loading.

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