ANALYSIS OF SHEAR FORCE OF REINFORCED CONCRETE WALLS AFTER CRACKS

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  • 鉄筋コンクリート壁体の亀裂発生後のせん力負担の解析
  • テッキン コンクリート ヘキタイ ノ キレツ ハッセイゴ ノ センチカラ フタン ノ カイセキ

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This report presents the theoretical analysis of shear force of reinforced concrete walls after cracks. In theoretical analysis, reinforced concrete wall after cracks is replaced a orthogonal anisotropic elastic panel of which principal axis inchine to horizontal and vertical axis at forty-five degrees. Analysis of anisotropic elastic panel is performed by finite differences method and its calculation, by I.B.M. 7090 electronic computer. Conclusicens of analysis are as follows, 1) The coefficient of shear force concentration of reinforced concrete walls after cracks, α is not affected by steel ratio, ρ and height-widlth ratio of panel, λ in case of which the efficient young modulus of tensile concrete, μ is frome 1.0 up to 0.5. In case that μ is below 0.5, α become large in inverse-proportion of ρ. 2) The lowering coefficient of bearable shear-force by cracks, β is not affected by ρ, λ in case that μ is frome 1.0 to 0.1 but below μ=0.1, β decrease violently by ρ. 3) Seismic-distribution coefficient of reinforced concrete walls of ultimate condition is assigned to be one-tenth of seismic-distribution coefficient of wall before cracks-occurrence.

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