X 方向上自桩内边缘到最近柱边的水平距离:
a1x = 750 - 0.5hc - 0.5bp = 750-800/2-433/2 = 133mm
λ1x = a1x / ho = 133/(700-110) = 0.226
X 方向上角桩冲切系数 β1x = 0.56 / (λ1x + 0.2) (基础规范 8.5.17-6)
β1x = 0.56/(0.226+0.2) = 1.314
Y 方向上自桩内边缘到最近柱边的水平距离:
a1y = 750 - 0.5bc - 0.5bp = 750-800/2-433/2 = 133mm
λ1y = a1y / ho = 133/(700-110) = 0.226
Y 方向上角桩冲切系数 β1y = 0.56 / (λ1y + 0.2) (基础规范 8.5.17-7)
β1y = 0.56/(0.226+0.2) = 1.314
桩内边缘到承台外边缘的水平距离:
c1 = c2 = Sc + 0.5bp = 500+433/2 = 717mm
[β1x * (c2 + a1y / 2) + β1y * (c1 + a1x / 2)] * βhp * ft * ho
= [1.314*(717+133/2)+1.314*(717+133/2)]*1*1.43*590
= 1739844N ≥ Nl = 1343047N,满足要求。
3、承台斜截面受剪承载力计算:
(1)、X方向斜截面受剪承载力计算:
扣除承台及其上填土自重后 X 方向斜截面的最大剪力设计值:
Vx = Max{N1 + N2, N3 + N4} = 2686095N
承台斜截面受剪承载力按下列公式计算:
Vx ≤ βhs * βy * ft * bxo * ho (基础规范 8.5.18-1)
X 方向上自桩内边缘到最近柱边的水平距离:
ay = 750 - 0.5bc - 0.5bp = 750-800/2-433/2 = 133mm
λy = ay / ho = 133/(700-110) = 0.226
当 λy < 0.3 时,取 λy = 0.3
βy = 1.75 / (λy + 1.0) = 1.75/(0.3+1.0) = 1.346
βhs * βy * ft * bxo * ho = 1*1.346*1.43*2500*590 = 2845115N
≥ Vx = 2686095N,满足要求。
(2)、Y方向斜截面受剪承载力计算:
扣除承台及其上填土自重后 Y 方向斜截面的最大剪力设计值:
Vy = Max{N1 + N3, N2 + N4} = 2686095N
承台斜截面受剪承载力按下列公式计算:
Vy ≤ βhs * βx * ft * byo * ho (基础规范 8.5.18-1)
Y 方向上自桩内边缘到最近柱边的水平距离:
ax = 750 - 0.5hc - 0.5bp = 750-800/2-433/2 = 133mm
λx = ax / ho = 133/(700-110) = 0.226
当 λx < 0.3 时,取 λx = 0.3
βx = 1.75 / (λx + 1.0) = 1.75/(0.3+1.0) = 1.346
βhs * βx * ft * byo * ho = 1*1.346*1.43*2500*590 = 2845115N
≥ Vy = 2686095N,满足要求。
4、柱下局部受压承载力计算: 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(83):http://www.youerw.com/gongcheng/lunwen_1016.html