| 目次へ 【天井_矩形断面】 |
|
|
|
|
|
|
|
設備耐震_天井_据付_矩形 |
|
|
|
|
|
|
|
|
|
|
|
|
|
FALSE |
|
| ●アンカーボルトの引抜力 Rb |
|
|
|
|
|
|
|
|
| Rb=[Fh*hg+(W+Fv)*(L-Lg)]/(L*nt) |
|
|
|
|
|
|
|
|
=[4.5*80+(3+2.25)*(90-31)]/(90*2)=3.72[kN] |
|
|
1 |
|
0 |
|
|
|
|
|
|
|
|
|
|
|
|
| ここで、 |
Fh=設計用水平地震力=Kh*W0=1.5*3=4.5[kN] |
|
|
|
|
|
|
|
Kh=設計用水平震度=1.5 |
|
|
|
|
|
1.5 |
|
|
W=機器重量=3[kN] |
W0=有効重量=3[kN] |
|
|
|
|
3 |
|
|
hg=据付け面より機器重心までの高さ=80[cm] |
|
|
4.5 |
|
80 |
|
|
Fv=設計用鉛直地震力=Fh/2=4.5/2=2.25[kN] |
|
|
|
|
|
|
|
Lg=ボルト中心から機器重心までの距離（Lg<L/2) |
|
|
|
|
|
|
31 |
|
|
=31[cm] |
|
|
|
|
|
|
|
|
|
|
|
|
L=ボルトスパン=90[cm] |
|
|
|
|
|
|
|
|
90 |
|
|
nt=引張ボルト総本数=2 |
|
|
|
|
|
|
|
|
2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ●アンカーボルトのせん断力
Q |
|
|
|
|
|
|
|
|
|
|
|
| Q=Fh/n=4.5/4=1.12[kN/本] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ここで、 |
n=アンカーボルトの総本数=4 |
|
|
|
|
|
|
|
|
4 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ●アンカーボルトの検定 |
|
|
|
|
|
|
|
|
|
|
|
| σ=Rb/A=3.72/1.131=3.29[kN/cm2]
< 17.6[kN/cm2] |
|
|
|
|
|
|
|
|
|
| τ=Fh/(n*A)=4.5/(4*1.131)=0.99[kN/cm2]
< 10.1[kN/cm2] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ここで、 |
A=アンカーボルト1本当たり軸断面積=π*d^2/(0.75*4)=1.131[cm2] |
|
|
|
|
|
0 |
0 |
|
d=アンカーボルト径=1.2[cm] |
|
|
|
|
|
|
|
|
2 |
0 |
|
ft=許容引張応力度=17.6[kN/cm2] |
|
|
|
|
|
|
|
|
|
|
fs=許容せん断応力度=10.1[kN/cm2] |
|
|
|
|
|
|
|
|
|
|
fts=引張とせん断を同時に受けるボルトの許容引張応力度 |
|
|
|
|
|
|
|
|
=1.4ft-1.6τ=1.4*17.6-1.6*0.99=23.056[kN/cm2] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ●アンカーボルト埋め込み長さ |
|
|
|
|
|
|
|
|
|
|
|
| 埋め込み長さL=10[cm] |
|
|
|
|
|
|
|
|
|
10 |
|
| アンカーボルト=後施工金属拡張アンカー_おねじ_M12 |
|
|
|
|
|
|
|
0 |
埋込式J形基礎ボルト |
| 許容引抜き力=4.5[kN]
> Rb=3.72 |
|
|
|
|
|
|
|
|
|
6 |
後施工金属拡張アンカー_おねじ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
FALSE |
|
|
|
|
|
|
|
|
|
|
|
|
|
1.8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
