项目名称_____________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) 《简明高层钢筋混凝土结构设计手册(第二版)》 2.几何参数: 已知尺寸: B1 = 1500 mm, A1 = 1500 mm H1 = 200 mm, H2 = 300 mm
B = 370 mm, A = 370 mm 无偏心: B2 = 1500 mm, A2 = 1500 mm 基础埋深d = 1.50 m 钢筋合力重心到板底距离as = 60 mm 3.荷载值: (1)作用在基础顶部的标准值荷载 Fgk = 136.00 kN Fqk = 0.00 kN Mgxk = 0.00 kN·m Mqxk = 0.00 kN·m Mgyk = 0.00 kN·m Mqyk = 0.00 kN·m Vgxk = 0.00 kN Vqxk = 0.00 kN Vgyk = 0.00 kN Vqyk = 0.00 kN (2)作用在基础底部的弯矩标准值 Mxk = Mgxk+Mqxk = 0.00+0.00 = 0.00 kN·m Myk = Mgyk+Mqyk = 0.00+0.00 = 0.00 kN·m Vxk = Vgxk+Vqxk = 0.00+0.00 = 0.00 kN·m Vyk = Vgyk+Vqyk = 0.00+0.00 = 0.00 kN·m 绕X轴弯矩: M0xk = Mxk-Vyk·(H1+H2) = 0.00-0.00×0.50 = 0.00 kN·m 绕Y轴弯矩: M0yk = Myk+Vxk·(H1+H2) = 0.00+0.00×0.50 = 0.00 kN·m (3)作用在基础顶部的基本组合荷载 不变荷载分项系数rg = 1.35 活荷载分项系数rq = 1.40 F = rg·Fgk+rq·Fqk = 183.60 kN Mx = rg·Mgxk+rq·Mqxk = 0.00 kN·m My = rg·Mgyk+rq·Mqyk = 0.00 kN·m Vx = rg·Vgxk+rq·Vqxk = 0.00 kN Vy = rg·Vgyk+rq·Vqyk = 0.00 kN (4)作用在基础底部的弯矩设计值 绕X轴弯矩: M0x = Mx-Vy·(H1+H2) = 0.00-0.00×0.50 = 0.00 kN·m 绕Y轴弯矩: M0y = My+Vx·(H1+H2) = 0.00+0.00×0.50 = 0.00 kN·m 4.材料信息: 混凝土: C30 钢筋: HRB400(20MnSiV、20MnSiNb、20MnTi) 5.基础几何特性: 底面积:S = (A1+A2)(B1+B2) = 3.00×3.00 = 9.00 m2 绕X轴抵抗矩:Wx = (1/6)(B1+B2)(A1+A2)2 = (1/6)×3.00×3.002 = 4.50 m3 绕Y轴抵抗矩:Wy = (1/6)(A1+A2)(B1+B2)2 = (1/6)×3.00×3.002 = 4.50 m3
三、计算过程
1.修正地基承载力 计算公式: 按《建筑地基基础设计规范》(GB 50007-2002)下列公式验算: fa = fak+ηb·γ·(b-3)+ηd·γm·(d-0.5) (式5.2.4) 式中:fak = 50.00 kPa εb = 0.00,ηd = 1.00 γ = 10.00 kN/m3 γm = 10.00 kN/m3
b = 3.00 m, d = 1.20 m 如果 b < 3m,按 b = 3m, 如果 b > 6m,按 b = 6m 如果 d < 0.5m,按 d = 0.5m fa = fak+ηb·γ·(b-3)+ηd·γm·(d-0.5) = 50.00+0.00×10.00×(3.00-3.00)+1.00×10.00×(1.20-0.50) = 57.00 kPa 修正后的地基承载力特征值 fa = 57.00 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 (5.2.4-1) Fk = Fgk+Fqk = 136.00+0.00 = 136.00 kN Gk = 20S·d = 20×9.00×1.50 = 270.00 kN pk = (Fk+Gk)/S = (136.00+270.00)/9.00 = 45.11 kPa ≤ fa,满足要求。 3.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 (8.2.7-3) am = (at+ab)/2 (8.2.7-2) pjmax,x = F/S+M0y/Wy = 183.60/9.00+0.00/4.50 = 20.40 kPa pjmin,x = F/S-M0y/Wy = 183.60/9.00-0.00/4.50 = 20.40 kPa pjmax,y = F/S+M0x/Wx = 183.60/9.00+0.00/4.50 = 20.40 kPa pjmin,y = F/S-M0x/Wx = 183.60/9.00-0.00/4.50 = 20.40 kPa pj = pjmax,x+pjmax,y-F/S = 20.40+20.40-20.40 = 20.40 kPa (1)柱对基础的冲切验算: H0 = H1+H2-as = 0.20+0.30-0.06 = 0.44 m X方向: Alx = 1/4·(A+2H0+A1+A2)(B1+B2-B-2H0) = (1/4)×(0.37+2×0.44+3.00)(3.00-0.37-2×0.44) = 1.86 m2 Flx = pj·Alx = 20.40×1.86 = 37.93 kN ab = min{A+2H0, A1+A2} = min{0.37+2×0.44, 3.00} = 1.25 m amx = (at+ab)/2 = (A+ab)/2 = (0.37+1.25)/2 = 0.81 m Flx ≤ 0.7·βhp·ft·amx·H0 = 0.7×1.00×1430.00×0.810×0.440 = 356.76 kN,满足要求。 Y方向: Aly = 1/4·(B+2H0+B1+B2)(A1+A2-A-2H0) = (1/4)×(0.37+2×0.44+3.00)(3.00-0.37-2×0.44) = 1.86 m2 Fly = pj·Aly = 20.40×1.86 = 37.93 kN ab = min{B+2H0, B1+B2} = min{0.37+2×0.44, 3.00} = 1.25 m amy = (at+ab)/2 = (B+ab)/2 = (0.37+1.25)/2 = 0.81 m Fly ≤ 0.7·βhp·ft·amy·H0 = 0.7×1.00×1430.00×0.810×0.440
= 356.76 kN,满足要求。 4.基础受压验算 计算公式:《混凝土结构设计规范》(GB 50010-2002) Fl ≤ 1.35·βc·βl·fc·Aln (7.8.1-1) 局部荷载设计值:Fl = 183.60 kN 混凝土局部受压面积:Aln = Al = B×A = 0.37×0.37 = 0.14 m2 混凝土受压时计算底面积:Ab = min{B+2A, B1+B2}×min{3A, A1+A2} = 1.23 m2 混凝土受压时强度提高系数:βl = sq.(Ab/Al) = sq.(1.23/0.14) = 3.00 1.35βc·βl·fc·Aln = 1.35×1.00×3.00×14300.00×0.14 = 7928.56 kN ≥ Fl = 183.60 kN,满足要求。 5.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=a12[(2l+a')(pmax+p-2G/A)+(pmax-p)·l]/12 (8.2.7-4) MⅡ=(l-a')2(2b+b')(pmax+pmin-2G/A)/48 (8.2.7-5) (1)柱根部受弯计算: G = 1.35Gk = 1.35×270.00 = 364.50kN p = (F+G)/S = (183.60+364.50)/9.00 = 60.90 kPa Ⅰ-Ⅰ截面处弯矩设计值: MⅠ= (B1+B2-B)2[2(A1+A2)+A](p-G/S)/24 = (3.00-0.37)2(2×3.00+0.37)(60.90-364.50/9.00)/24 = 37.45 kN.m Ⅱ-Ⅱ截面处弯矩设计值: MⅡ= (A1+A2-A)2[2(B1+B2)+B](p-G/S)/24.0 = (3.00-0.37)2(2×3.00+0.37)(60.90-364.50/9.00)/24 = 37.45 kN.m Ⅰ-Ⅰ截面受弯计算: 相对受压区高度: δ= 0.004519 配筋率: ρ= 0.000180 ρ < ρmin = 0.001500 ρ = ρmin = 0.001500 计算面积:750.00 mm2/m Ⅱ-Ⅱ截面受弯计算: 相对受压区高度: δ= 0.004519 配筋率: ρ= 0.000180 ρ < ρmin = 0.001500 ρ = ρmin = 0.001500 计算面积:750.00 mm2/m
四、计算结果
1.X方向弯矩验算结果: 计算面积:750.00 mm2/m 采用方案:f12@130 实配面积:869.98 mm2/m 2.Y方向弯矩验算结果: 计算面积:750.00 mm2/m 采用方案:f12@130
实配面积:869.98 mm2/m
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