项目名称_____J5______日 期_____________ 设 计 者_____________校 对 者_____________
一、示意图
基础类型:锥型柱基 平面:
计算形式:验算截面尺寸
剖面:
二、基本参数
1.依据规范 《建筑地基基础设计规范》(GB 50007--2002) 《混凝土结构设计规范》(GB 50010--2002) 2.几何参数: 已知尺寸: B1 = 1250(mm), A1 = 1250(mm) H1 = 500(mm), H2 = 250(mm)
B = 250(mm), A = 600(mm) 无偏心: B2 = 1250(mm), A2 = 1250(mm) 基础埋深d = 2000(mm), 钢筋合力重心到板底距离 = 50(mm), 3.荷载值: (1)作用在基础顶部的基本组合荷载 竖向荷载F = 1654.00kN Mx = 2.00kN*m My = 27.00kN*m Vx = 88.00kN Vy = 8.00kN (2)作用在基础底部的弯矩设计值 绕X轴弯矩: M0x = Mx - Vy * d = 2.00 - (8.00)*1.00 = -6.00kN*m 绕y轴弯矩: M0y = My + Vx * d = 27.00 + (88.00)*1.00 = 115.00kN*m 4.材料信息: 混凝土: C25 钢筋: HRB335(20MnSi)
三、计算过程
1.修正地基承载力 修正后的地基承载力特征值 fa = 240.00 kPa 2.轴心荷载作用下地基承载力验算 计算公式: 按《建筑地基基础设计规范》(GB 50007--2002)下列公式验算: pk = (Fk+Gk)/A (式5.2.4-1) 其中:A = 2.50 * 2.50 = 6.25m2 Fk = F/Ks = 1654.00/1.25 = 1323.20kN Gk = A*d*20 = 6.25*1.00*20 = 125.00kN pk = (Fk+Gk)/A = ( 1323.20 + 125.00 ) / 6.25 = 231.71 kPa ≤fa, 满足要求 3.偏心荷载作用下地基承载力验算 计算公式: 按《建筑地基基础设计规范》(GB 50007--2002)下列公式验算: 当eb/6时,pkmax=3(Fk+Gk)/3la (式5.2.2-4) X、Y方向同时受弯: Mxk = M0x/Ks = 6.00/1.25 = 4.80kN*m Myk = M0y/Ks = 115.00/1.25 = 92.00kN*m Fk = F/Ks = 1654.00/1.25 = 1323.20kN Gk = G/1.35 = 168.75/1.35 = 125.00kN pkmax = 268.88 kPa ≤1.2 * fa = 1.2 * 240.00 = 288.00 kPa, 满足要求 4.基础抗冲切验算 计算公式: 按《建筑地基基础设计规范》(GB 50007--2002)下列公式验算: Fl ≤ 0.7 * βhp * ft * am * h0 (8.2.7-1) Fl = pj * Al (8.2.7-2)
am = (at + ab)/2 (8.2.7-3) (1)柱子对基础的冲切验算: X方向(a方向): pj = pjmax = 311.10 kPa Alx = 1.00 m2 Flx = pj * Ax = 311.10 * 1.00 = 311.10 kN ab = Min{bc+2*ho,b} = Min{ 0.60 + 2 * 0.70 ,2.50} = 2.00 m amx = (at+ab)/2 = (0.60 + 2.00)/2 = 1.30 m Flx ≤0.7 * βhp * ft * amx * ho = 0.7 * 1.00 * 1270.00 * 1.300 * 0.700 = 808.99 kN, 满足要求 Y方向(b方向): pj = pjmax = 311.10 kPa Aly = 0.47 m2 Fly = pj * Ay = 311.10 * 0.47 = 147.77 kN ab = Min{ac+2*ho,a} = Min{ 0.25 + 2 * 0.70 ,2.50} = 1.65 m amy = (at+ab)/2 = (0.25 + 1.65)/2 = 0.95 m Fly ≤0.7 * βhp * ft * amy * ho = 0.7 * 1.00 * 1270.00 * 0.950 * 0.700 = 591.18 kN, 满足要求 5.基础受压验算 计算公式:《混凝土结构设计规范》(7.8.1-1) Fl ≤ 1.35*βc*βl* fc * Aln 局部荷载设计值:Fl = 1654.00 kN 混凝土局部受压面积:Al = bc * hc = 0.25 * 0.60 = 0.15m2 混凝土受压时计算底面积:Ab = 1.35m2 混凝土受压时强度提高系数:β= sqr(Ab/Al) = sqr(1.35/0.15) = 3.00 1.35 * βc * β * fc * Al = 1.35 * 1.00 * 3.00 * 11900.00 * 0.15 = 7229.25 kN > Fl = 1654.00 kN 满足要求! 6.基础受弯计算 计算公式: 按《建筑地基基础设计规范》(GB 50007--2002)下列公式验算: MⅠ=a1**2*(2*l+a')*(pmax+p-2*G/A+(pmax-p)*l)/12 (8.2.7-4)
MⅡ=(l-a')**2 * (2*b+b')*(pmax+pmin-2*G/A)/48 (8.2.7-5) (1)柱根部受弯计算:
X方向受弯截面基底反力设计值: pnx=pminx+(pmaxx-pminx)*(l/2.0+lo/2.0)/l =247.48+(335.80-247.48)*(2.50+0.25)/2.50/2 =287.22 kPa
Y方向受弯截面基底反力设计值: pny=pminy+(pmaxy-pminy)*(b/2.0+bo/2.0)/b =289.34+(293.94-289.34)*(2.50+0.60)/2.50/2 =291.09 kPa
Ⅰ-Ⅰ截面处弯矩设计值:
MⅠ= (l/2-l0/2)*(l/2-l0/2)*((2*b+bo)*(pmaxx+pnx-2*G/A)+(pmaxx-pnx)*b)/12 = (2.50/2-0.25/2)*(2.50/2-0.25/2)*((2*2.50+0.60) *(335.80+287.22-2*168.75/6.25)+(335.80-287.22)*2.50)/12 = 348.89 kN.m
Ⅱ-Ⅱ截面处弯矩设计值:
MⅡ= (b/2-bo/2)*(b/2-bo/2)*((2*l+lo)*(pmaxy+pny-2*G/A)+(pmaxy-pny)*l)/12 = (2.50/2-0.60/2)*(2.50/2-0.60/2)*((2*2.50+0.25) *(293.94+291.09-2*168.75/6.25)+(293.94-291.09)*2.50)/12 = 210.21 kN.m Ⅰ-Ⅰ截面受弯计算: 相对受压区高度: ζ= 0.024227 配筋率: ρ= 0.000897 ρ < ρmin = 0.0015 ρ = ρmin = 0.0015 计算面积:2812.50 mm2 Ⅱ-Ⅱ截面受弯计算: 相对受压区高度: ζ= 0.014526 配筋率: ρ= 0.000538 ρ < ρmin = 0.0015 ρ = ρmin = 0.0015 计算面积:2812.50 mm2
四、计算结果
1.X方向(a方向)弯矩计算结果: 计算面积:2812.50 mm2/m 采用方案:D14@120 实配面积:3207.04 mm2/m 2.Y方向(b方向)弯矩计算结果: 计算面积:2812.50 mm2/m 采用方案:D14@120 实配面积:3207.04 mm2/m
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