| 目次へ 【床_据付_円形断面】 |
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設備耐震_床_据付_円形 |
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TRUE |
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| ●アンカーボルトの引抜力 Rb |
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| Rb=4*Fh*hg/(n*D)-(W-Fv)/n |
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=4*44.79*100/(16*198)-(56.7-22.4)/16=3.51[kN/本] |
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1 |
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1 |
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| ここで、 |
Fh=設計用水平地震力=Kh*W0=1*44.79=44.79[kN] |
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Kh=設計用水平震度=1 |
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1 |
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W=機器重量=56.7[kN] |
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56.7 |
44.79 |
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hg=据付け面より機器重心までの高さ=100[cm] |
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0.75 |
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100 |
200 |
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Fv=設計用鉛直地震力=Fh/2=44.79/2=22.4[kN] |
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95 |
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n=アンカーボルトの総本数=16 |
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D=アンカーボルトPCD=198[cm] |
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Ze=断面係数=π*(D^4-d^4)/(32*D) |
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198 |
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=π*(198^4-197.974^4)/(32*198)=400.19[cm3] |
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te=n*A/(π*D)=16*0.503/(π*198)=0.013[cm] |
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d=D-2*te=198-2*0.013=197.974[cm] |
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W0=有効重量=44.79[kN] |
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| ●ボルトの検定 |
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16 |
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| Q=せん断力=Fh/n=44.79/16=2.8[kN/本] |
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| σ=引張応力度=Rb/A=3.51/0.503=6.98[kN/cm2]
< 15.73[kN/cm2] |
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| τ=せん断応力度=Fh/(n*A)=44.79/(16*0.503)=5.57[kN/cm2]
< 10.1[kN/cm2] |
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A=アンカーボルト1本当たり軸断面積=π*d^2/4=0.503[cm2] |
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d=アンカーボルト径=0.8[cm] |
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0 |
0 |
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ft=許容引張応力度=17.6[kN/cm2] |
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0 |
0 |
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fs=許容せん断応力度=10.1[kN/cm2] |
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fts=許容引張応力度=1.4ft-1.6τ=1.4*17.6-1.6*5.57=15.73[kN/cm2] |
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| ●アンカーボルト埋め込み長さ |
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| Ta=6*π*L^2*p=6*π*10^2*0.011=20.73[kN/本]
> Rb=3.51 |
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| 又はTa=ft*A=8.85
> Rb=3.51 |
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10 |
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Ta=短期許容引抜き荷重 |
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0 |
埋込式J形基礎ボルト |
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L=ボルト埋め込み長さ=10[cm] |
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0 |
埋込式_J形 |
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p=補正係数=(1/6)*(0.05+Fc/100)=(1/6)*(0.05+1.8/100)=0.011 |
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Fc=コンクリートの設計基準強度=1.8[kN/cm2] |
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TRUE |
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アンカーボルト=埋込式_J形_M8 |
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1.8 |
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