独立基础计算书 doc
独立柱基计算书项目名称_____________日期______
设 计 者_____________
校 对 者_____________
一、基础类型及计算形式
平面:
剖面:
基础类型:锥型柱基
计算形式:验算截面尺寸
已知尺寸:
B1 = 600(mm), W1 = 1050(mm)
H1 = 450(mm), H2 = 0(mm)
B = 460(mm), H = 540(mm)
无偏心:
B2 = 600(mm), W2 = 1050(mm)
二、几何数据及材料特性
混凝土: C25 钢筋: 二级(d<=25)
三、荷载数据
竖向荷载F = 83.00kN
自重土重G = 68.04kN
Mx = 45.00kN*m
My = 0.00kN*m
四、地基承载力设计值
计算公式:《建筑地基基础设计规范》(GB50007-2002)
f = fak + ηb*γ*(b-3) + ηd*γm*(d-0.5)(式5.2.4)
式中:fak = 240.00 kPa
ηb = 0.30,ηd = 1.60
γ = 18.00 kN/m3 γm = 18.00 kN/m3
b = 2.10 m, d = 1.50 m
如果 b < 3m,按 b = 3m, 如果 b > 6m,按 b = 6m
如果 d < 0.5m,按 d = 0.5m
f = fak + ηb*γ*(b-3) + ηd*γm*(d-0.5)
= 240.00 + 0.30*18.00*( 3.00-3.00) + 1.60*18.00*( 1.50-0.50)
= 268.80 kPa
地基承载力设计值 f = 268.80 kPa
五、轴心荷载作用下地基承载力验算
p = (F+G)/A
其中:A = 2.10 * 1.20 = 2.52 m2
p = ( 83.00 + 68.04 ) / 2.52 = 59.94 kPa ≤f,, 满足要求
计算公式:
pmax=(F+G)/A+M/W
pmin=(F+G)/A-M/W
Y方向(b方向):
Mx = 45.00kN*m
偏心矩ey = Mx/(F+G)
= 45.00/(83.00 + 68.04)
= 0.30 m≤ b/6 = 2.10/6 = 0.35 m
偏心矩ey, 满足要求
基础底面抵抗矩 Wy = a * b * b / 6
= 1.20 * 2.10 * 2.10 / 6
= 0.88m3
PmaxY = ( 83.00 + 68.04 ) / 2.52 + 45.00 / 0.88
= 110.96 kPa
≤ 1.2 * f = 1.2 * 268.80 = 322.56 kPa,, 满足要求
PminY = ( 83.00 + 68.04 ) / 2.52 - 45.00 / 0.88
= 8.92 kPa
≥ 0, 满足要求。
六、柱与基础交接处基础抗冲切验算
计算公式:
按《混凝土结构设计规范》(GBJ10-89)下列公式验算:
Fl ≤ 0.6 * ft * bm * h0 (4.4.3-1)
Fl = ps * A (4.4.3-2)
bm = (bt + bb)/2 (4.4.3-3)
X方向(a方向):
Ps = F/A + My/Wx
= 83.00 / 2.52 + 0.00 / 0.50
= 32.94 kPa
Ax = 0.00 m2
Flx= ps * Ax
= 32.94 * 0.00
= 0.00 kN
bb= Min{bc+2*ho,b}
= Min{ 0.54 + 2 * 0.41 , 2.10}
= 1.35 m
bmx = (bt+bb)/2
= ( 0.54 + 1.35 )/2
= 0.95 m
Flx ≤0.6 * ft * bmx * ho = 0.6 * 1300.00 * 0.95 * 0.41
= 298.53 kN, 满足要求
Y方向(b方向):
Ps = F/A + Mx/Wy
= 83.00 / 2.52 + 45.00 / 0.88
= 83.96 kPa
Ay = 0.45 m2
Fly= ps * Ay
= 83.96 * 0.45
= 37.68 kN
bb= Min{ac+2*ho,a}
= Min{ 0.46 + 2 * 0.41 , 1.20}
= 1.20 m
bmy = (bt+bb)/2
= ( 0.46 + 1.20 )/2
= 0.83 m
Fly ≤0.6 * ft * bmy * ho = 0.6 * 1300.00 * 0.83 * 0.41
= 262.20 kN, 满足要求
七、抗弯计算
Y方向(b方向):
弯矩:Mx = 45.00 kN*m 计算面积:139.03 mm2
可选方案:
#12@200
采用方案:#12@200
实配面积:565.49 mm2
页:
[1]