吸收塔基礎樁基承臺計算書.doc
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2023-09-27
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1、吸收塔基礎樁基承臺計算書一、基本資料: 承臺類型:十三樁承臺承臺計算方式:驗算承臺尺寸 單樁豎向承載力:樁采用夯擴底灌注樁,樁徑 D=377mm, 擴底直徑D=700mm 該樁為端承樁,樁端阻力特征值1500KN 單樁豎向承載力Qk=735KN 單樁水平承載力見單樁水平承載力計算書 1依據規范:建筑地基基礎設計規范(GB 500072002)混凝土結構設計規范(GB 500102002)2幾何參數:承臺邊緣至樁中心距: C = 1000 mm 樁列間距: A = 1800 mm樁行間距: B = 1800 mm承臺根部高度: H = 1500 mm承臺端部高度: h = 1500 mm 縱筋合2、力點到底邊的距離: as = 70 mm 平均埋深: hm = 1.80 m 矩形柱寬: Bc = 500 mm 矩形柱高: Hc = 500 mm 圓樁直徑: Ds = 377 mm 換算后樁截面:Ls = 302mm3荷載設計值:(作用在承臺頂部)豎向荷載: F = 3000.00 kN 繞X軸彎矩: Mx = 0.00 kNm繞Y軸彎矩: My = 0.00 kNmX向剪力: Vx = 60.00 kN Y向剪力: Vy = 0.00 kN4材料信息:混凝土強度等級: C30fc = 14.30 N/mm2ft = 1.43 N/mm2鋼筋強度等級: HRB335fy = 300.00 3、N/mm2二、計算過程:1作用在承臺底部的彎矩繞X軸彎矩: M0x = MxVyH = 0.000.001.50 = 0.00kNm繞Y軸彎矩: M0y = MyVxH = 0.0060.001.50 = 90.00kNm2基樁凈反力設計值:計算公式:建筑地基基礎設計規范(GB 500072002)Ni = F/nM0xyi/yj2M0yxi/xj2 (8.5.32)N1 = F/nM0yx1/xj2 = 3000.00/1290.00(-2.70)/48.60 = 245.00 kNN2 = F/nM0yx2/xj2 = 3000.00/1290.00(-0.90)/48.60 = 248.4、33 kNN3 = F/nM0yx3/xj2 = 3000.00/1290.000.90/48.60 = 251.67 kNN4 = F/nM0yx4/xj2 = 3000.00/1290.002.70/48.60 = 255.00 kNN5 = F/nM0yx5/xj2 = 3000.00/1290.00(-2.70)/48.60 = 245.00 kNN6 = F/nM0yx6/xj2 = 3000.00/1290.00(-0.90)/48.60 = 248.33 kNN7 = F/nM0yx7/xj2 = 3000.00/1290.000.90/48.60 = 251.67 kNN8 =5、 F/nM0yx8/xj2 = 3000.00/1290.002.70/48.60 = 255.00 kNN9 = F/nM0yx9/xj2 = 3000.00/1290.00(-2.70)/48.60 = 245.00 kNN10 = F/nM0yx10/xj2 = 3000.00/1290.00(-0.90)/48.60 = 248.33 kNN11 = F/nM0yx11/xj2 = 3000.00/1290.000.90/48.60 = 251.67 kNN12 = F/nM0yx12/xj2 = 3000.00/1290.002.70/48.60 = 255.00 kN3承臺受柱沖切6、驗算:計算公式:建筑地基基礎設計規范(GB 500072002)Fl 20x(bca0y)0y(hca0x)hpfth0 (8.5.171)X方向上自柱邊到最近樁邊的水平距離:a0x = 0.50 my方向上自柱邊到最近樁邊的水平距離:a0y = 1.40 m承臺有效高度:h0 = Has = 1.500.07 = 1.43 m作用于沖切破壞錐體上的沖切力設計值: Fl = FQi = 3000.000.00 = 3000.00 kNX方向沖跨比:0x = a0x/h0 = 0.50/1.43 = 0.35 Y方向沖跨比:0y = a0y/h0 = 1.40/1.43 = 0.98 X方向沖切7、系數:0x = 0.84/(0x0.2) = 0.84/(0.350.2) = 1.53 Y方向沖切系數:0y = 0.84/(0y0.2) = 0.84/(0.980.2) = 0.71 20x(Hca0y)0y(Bca0x)hpfth0 = 21.53(0.501.40)0.71(0.500.50)0.941430.001.43 = 13932.29 kN Fl = 3000.00 kN, 滿足要求。4承臺受剪驗算:計算公式:建筑地基基礎設計規范(GB 500072002)Fl hsftb0h0 (8.5.181)(1) 垂直Y方向截面的抗剪計算Y方向上自柱邊到計算一排樁的樁邊的水平距離:8、a0 = 1.40 m計算截面處承臺寬度:b = 3A2C = 31.8021.00 = 7.40 m 斜截面上最大剪力設計值:Vl = 1000.00 kN計算截面的剪跨比: a0/h0 = 1.40/1.43 = 0.98剪切系數: = 1.75/(1.0) = 1.75/(0.981.0) = 0.88承臺計算截面的計算寬度:be = b = 7.40 m hsftbeh0 = 0.860.881430.007.401.43 = 11575.85 kN Vl = 1000.00 kN, 滿足要求。(2) 垂直X方向截面的抗剪計算X方向上自柱邊到計算一排樁的樁邊的水平距離:a0 = 0.59、0 m計算截面處承臺寬度:b = 2B2C = 21.8021.00 = 5.60 m 斜截面上最大剪力設計值:Vl = 1520.00 kN計算截面的剪跨比: a0/h0 = 0.50/1.43 = 0.35剪切系數: = 1.75/(1.0) = 1.75/(0.351.0) = 1.30承臺計算截面的計算寬度:be = b = 5.60 m hsftbeh0 = 0.861.301430.005.601.43 = 12846.81 kN Vl = 1520.00 kN, 滿足要求。(3) 垂直X方向截面的抗剪計算X方向上自柱邊到計算一排樁的樁邊的水平距離:a0 = 2.30 m斜截面上最10、大剪力設計值:Vl = 765.00 kN計算截面的剪跨比: a0/h0 = 2.30/1.43 = 1.61剪切系數: = 1.75/(1.0) = 1.75/(1.611.0) = 0.67承臺計算截面的計算寬度:be = 5.60 m hsftbeh0 = 0.860.671430.005.601.43 = 6645.95 kN Vl = 765.00 kN, 滿足要求。5承臺角樁沖切驗算:計算公式:建筑地基基礎設計規范(GB 500072002)Nl 1x(c2a1y/2)1y(c1a1x/2)hpfth0(8.5.175)角樁豎向沖反力設計值:Nl = 255.00 kN從角樁內邊緣11、至承臺外邊緣的距離:c1 = CLs/2 = 1.000.30/2 = 1.15 mc2 = CLs/2 = 1.000.30/2 = 1.15 mX方向上從承臺角樁內邊緣引45度沖切線與承臺頂面相交點至角樁內邊緣的水平距離:(當柱或承臺變階處位于該45度線以內時,則取由柱邊或變階處與樁內邊緣連線為沖切錐體的錐線)a1x = 1.43 mY方向上從承臺角樁內邊緣引45度沖切線與承臺頂面相交點至角樁內邊緣的水平距離:(當柱或承臺變階處位于該45度線以內時,則取由柱邊或變階處與樁內邊緣連線為沖切錐體的錐線)a1y = 1.40 mX方向角樁沖跨比:1x = a1x/h0 = 1.43/1.43 =12、 1.00y方向角樁沖跨比:1y = a1y/h0 = 1.40/1.43 = 0.98X方向角樁沖切系數:1x = 0.56/(1x0.2) = 0.56/(1.000.2) = 0.47Y方向角樁沖切系數:1y = 0.56/(1y0.2) = 0.56/(0.980.2) = 0.481x(c2a1y/2)1y(c1a1x/2)hpfth0 = 0.47(1.151.40/2)0.48(1.151.43/2)0.941430.001.43 = 3370.10 kN Nl = 255.00 kN, 滿足要求。6承臺受彎計算:計算公式:建筑地基基礎設計規范(GB 500072002)Mx N13、iyi(8.5.161)計算公式:建筑地基基礎設計規范(GB 500072002)My Nixi(8.5.162)(1) 垂直X軸方向計算截面處彎矩計算:My Nixi = 2365.00 kNm相對受壓區高度:= 0.014548 配筋率:= 0.000693 min = 0.001500 = min = 0.001500 X向鋼筋: Asx = 12600.00 mm2(2) 垂直Y軸方向計算截面處彎矩計算:Mx = Niyi = 1550.00 kNm相對受壓區高度:= 0.007189 配筋率:= 0.000343 Fl = 3000.00 kN, 滿足要求。四、計算結果:1X方向鋼筋選筋結果計算面積As:12600.00 mm2采用方案:D20150實配面積:11938.05mm22Y方向鋼筋選筋結果計算面積As:16650.00 mm2采用方案:D18140實配面積:13486.86mm2