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外包式柱脚计算
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柱脚
- 柱脚
| 4轴外包式柱脚计算 | ||||||||
| 柱底内力 | 柱截面尺寸h﹡b﹡tw﹡t | |||||||
| M（kN•m) | N(kN) | V(kN） | C30混凝土 | h(mm) | b(mm) | tw(mm) | t(mm) | |
| 1234.49 | 365.76 | 85.57 | Ec(N/mm2) | fc(N/mm2) | 800 | 600 | 16 | 36 |
| 30000 | 14.3 | |||||||
| M作用下钢柱一侧翼缘轴力Nf | hc(mm) | =h-t | ||||||
| Nf=M/hc= | 1615.8246 | (kN) | = | 764 | ||||
| 栓钉受剪承载力Ncv | 栓钉规格∅ | 22 | ||||||
| Ncv<0.43*A*√(Ec*fc) |
A(mm2)=
|
380.13271 | ||||||
| = | 107.06126 | (kN) | 栓钉受拉设计值 | 包脚尺寸h'﹡b'*H | ||||
| Ncv<0.7*A*γ*f | f(N/mm2) | 215 | h'(mm) | b'(mm) | H(mm) | |||
| = | 95.540655 | (kN) | 栓钉抗拉与屈服强度之比 | 1300 | 1100 | 2000 | ||
| 栓钉数目n | >Nf/Ncv= | 16.91243 | γ= | 1.67 | 保护层厚度c(mm)= | 40 | ||
| 包脚底部弯矩Mb | 钢筋规格 | HRB335 | 保护层+纵筋+箍筋δ(mm)= | 77 | ||||
| Mb=M+V*H= |
fy(N/mm2)=
|
300 | 包脚有效高度h0(mm) | |||||
| = | 1405.63 | (kN•m) | 纵筋直径 | 25 | h0=h'-2*c= | 1146 | ||
| 纵向钢筋计算面积As | A1(mm2) | 490.87385 | 翼缘处混凝土有效宽度be=b'-b= | 500 | ||||
| As > Mb/(fy*h0) | 箍筋直径 | 12 | ||||||
| > | 4088.5108 | mm2 | A2(mm2) | 113.09734 | ||||
| As > 0.2%*h'*b' | 箍筋肢数nv | 6 | ||||||
| > | 2860 | mm2 | 箍筋间距s | 100 | ||||
| 纵筋根数n>As/A1= | 8.3290457 | |||||||
| 包脚底部剪力Vb | ||||||||
| Vb> | Mb/(H-c)= | 717.15816 | kN | |||||
| 包脚受剪承载力Ncs | ||||||||
| 1）Ncs(kN)=0.07*b'*h0*fc + 0.5*fy*A2*nv*h0/s= | 2428.3465 | 取小值Ncs(kN)= | 2428.3465 | |||||
| 2）Ncs(kN)=0.14*be*h0*fc + fy*A2*nv*h0/s= | 3480.1178 | Vcs>Vb,箍筋满足 | ||||||
| 注：所选内力组合为Mmin； | ||||||||
