局部荷载设计值 F = 5372190N
混凝土局部受压面积 Al = bc * hc = 640000mm2
承台在柱下局部受压时的计算底面积按下列公式计算:
Ab = (bx + 2 * c) * (by + 2 * c)
c = Min{Cx, Cy, bx, by} = Min{850,850,800,800} = 800mm
Ab = (800+2*800)*(800+2*800) = 5760000mm2
βl = Sqr(Ab / Al) = Sqr(5760000/640000) = 3
ω * βl * fcc * Al = 1.0*3*0.85*14.33*640000 = 23388891N
≥ F = 5372190N,满足要求。
5、桩局部受压承载力计算:
局部荷载设计值 F = Nmax + γg * Qgk = 1343+1.35*54.8 = 1417.0kN
混凝土局部受压面积 Al = π * d ^ 2 / 4 = 196350mm2
承台在角桩局部受压时的计算底面积按下列公式计算:
Ab = (bx + 2 * c) * (by + 2 * c)
圆桩 bx = by = Sqr(Al) = 443mm
c = Min{Cx, Cy, bx, by} = Min{250,250,443,443} = 250mm
Ab = (443+2*250)*(443+2*250) = 889463mm2
βl = Sqr(Ab / Al) = Sqr(889463/196350) = 2.128
ω * βl * fcc * Al = 1.0*2.128*0.85*14.33*196350 = 5090815N
≥ F = 1416995N,满足要求。 五层现浇钢筋混凝土框架结构商业中心建筑与结构设计和CAD图纸(84):http://www.youerw.com/gongcheng/lunwen_1016.html