| 目次へ 【べた基礎_Adタイプ】 |
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設備耐震_べた基礎_Ad |
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| ●ダボ筋の引抜き力Rb[kN/本] |
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| Rb=Kh*[{(hf+hg)*W+hf*Wf/2}-(1-Kv){(Lg+(Lf-L)*W/2+Lf*Wf/2}]/(nt*d) |
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=1*[{(30+95)*1.9+30*3.3/2}-(1-0.5){(20+(80-60)*1.9/2+80*3.3/2)}]/(3*75)=0.9[kN] |
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1 |
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| ここで、 |
L=設備機器の幅=60[cm] |
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60 |
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Lg=設備機器の重心位置=20[cm] |
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20 |
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hg=設備機器重心高さ=95[cm] |
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95 |
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Lf=基礎長さ=80[cm] |
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80 |
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hf=基礎高さ=30[cm] |
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30 |
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Lw=基礎幅=60cm] |
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60 |
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Kh=設計用水平震度=1 |
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1 |
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Kv=設計用鉛直震度=0.5 |
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W=設備機器重量=1.9[kN] |
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1.9 |
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Wf=基礎重量 |
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=hf*Lf*Lw*γ=30*80*60*23E-06=3.3[kN] |
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γ=コンクリート比重量=23E-06[kN/cm3] |
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23 |
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nt=片側のダボ筋本数=3 |
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3 |
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d=基礎端からダボ筋までの距離=75[cm] |
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75 |
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| ●ダボ筋のせん断力Q[kN]、せん断応力τ[kN/cm2] |
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| Q=Kh*(W+Wf)/n=1*(1.9+3.3)/6=0.87[kN] |
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| ここで、 |
n=ダボ筋総本数=6 |
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6 |
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| ●ダボ筋の検定 |
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| 付着応力度より
S=3.1≧Rb/(fa*(L1-1)=0.9/(0.04*(10-1))=2.5 |
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| せん断応力度より
A=0.785≧Q/fs=0.87/17.03=0.051 |
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fa=コンクリートの短期許容付着応力度[kN/cm2] |
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=1.5*Fc/10 かつ (0.135+Fc/25)*1.5 |
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=0.0405 かつ
(0.135+0.27/25)*1.5=0.2187 |
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fs=鉄筋の許容せん断応力度=17.03[kN/cm2] |
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17.03 |
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Fc=コンクリートの設計基準強度=0.27[kN/cm2] |
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0.27 |
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L1=鉄筋の埋込み長さ=10[cm] |
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10 |
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dk=ダボ筋径=1[cm] |
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1 |
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A=ダボ筋の軸断面積 |
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=π*dk^2/4=[cm2]=π*dk^2/4=0.785[cm2] |
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S=ダボ筋の周長=π*d=π*1=3.1[cm] |
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鉄筋の種類=SR295 |
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2 |
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