Mkx = Mkx' - Vky * H1、 Mky = Mky' + Vkx * H1
F、Mx 、My --- 相应于荷载效应基本组合时,竖向力、弯矩设计值(kN、kN•M);
F = γz * Fk、 Mx = γz * Mkx、 My = γz * Mky
Nk = 3018.0; Mkx'= 0.0; Mky'= 0.0; Vkx = 0.0; Vky = 0.0
Fk = 3018.0; Mkx = 0.0; Mky = 0.0
F = 4074.3; Mx = 0.0; My = 0.0
三、承台自重和承台上土自重标准值 Gk:
a = 2 * (577 + Sa) = 2*(577+750) = 2654mm
b = 2 * Sc + Sb = 2*500+1320 = 2320mm
承台底部面积 Ab = 4.56-0.15-2*0.14 = 4.12m
承台体积 Vct = Ab * H1 = 4.12*0.850 = 3.506m
承台自重标准值 Gk'' = γc * Vct = 25.00*3.506 = 87.6kN
承台上土自重标准值 Gk' = γs * (Ab - bc * hc) * ds
= 20.00*(4.12-0.700*0.700)*1.100 = 80.0kN
承台自重和承台上土自重标准值 Gk = Gk'' + Gk' = 87.6+80.0 = 167.6kN
四、承台验算:
圆桩换算桩截面边宽 bp = 0.866 * d = 0.866*500 = 433mm
1、承台受弯计算:
(1)、单桩桩顶竖向力计算:
在轴心竖向力作用下
Qk = (Fk + Gk) / n (基础规范 8.5.3-1)
Qk = (3018.0+167.6)/3 = 1061.9kN ≤ Ra = 1500.0kN
每根单桩所分配的承台自重和承台上土自重标准值 Qgk:
Qgk = Gk / n = 167.6/3 = 55.9kN
扣除承台和其上填土自重后的各桩桩顶相应于荷载效应基本组合时的竖向力设计值:
Ni = γz * (Qik - Qgk)
N = 1.35*(1061.9-55.9) = 1358.1kN
(2)、承台形心到承台两腰的距离范围内板带的弯矩设计值:
S = (Sa ^ 2 + Sb ^ 2) ^ 0.5 = (0.750^2+1.320^2)^0.5 = 1.518m
αs = 2 * Sa = 2*0.750 = 1.500m
α = αs / S = 1.500/1.518 = 0.988
承台形心到承台两腰的距离 B1 = Sa / S * 2 * Sb / 3 + Sc = 0.935m
M1 = Nmax * [S - 0.75 * c1 / (4 - α ^ 2) ^ 0.5] / 3 (基础规范 8.5.16-4)
= 1358.1*[1.518-0.75*0.700/(4-0.988^2)^0.5]/3
= 550.6kN•m
②号筋 Asy = 2216mm ζ = 0.083 ρ = 0.33%
918@100 (As = 2290)
(3)、承台形心到承台底边的距离范围内板带的弯矩设计值:
承台形心到承台底边的距离 B2 = Sb / 3 + Sc = 0.940m 五层教学楼框剪结构建筑设计和结构设计计算书和CAD图纸(67):http://www.youerw.com/gongcheng/lunwen_1083.html