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1、A 轴柱下条形基础设计9.1 基础布置及尺寸确定本设计采用天然地基,地质资料如下表所示,本人计算A轴条形基础表 9-1 地基土层物理力学指标综合表地质资料土层号厚度(m)土质名称土容重 r(kN/m3)承载力待征值fk(kN/m2)0.6杂填土189黄色粉质粘土19130.004.3灰色砂质粘土19120.0011灰色淤泥质粘土18705暗绿色粉质粘土20160未打穿灰色粉细砂19210表 9-2 A轴柱内力(恒载+活载标准值)统计框架轴编号1,72,3,4,5,6Mk(kNm)6.719.58Nk(kN)364.85521.21Vk(kN)-4.28-6.11mkNMk32.61271.65
2、58.9kNNk75.3335285.364521.521kNVk11.39)228.4511.6(底层墙重:KNlgk89.15964.21.245.06285.04.21.25.765.4812.7(1)条形基础沿三条纵向柱列分别设置。(2)条形基础两端各伸出柱边外:mml150.1,125.15.441410取,基础总长:64.5+21.15=29.3m(3)基础高度1125mm7504161lh,取 h=800 mm(4)基础梁宽mmb500100400100柱宽(5)基础埋深md7.18.05.04.0(6)基础底宽2/59.127.145.0101925.019)5.02/4.0(
3、18mkNrm查规范,因为 e0.85,得0b,0.1d2/11.1455.07.159.120.1130)5.0()3(mkNdrbrffmdbaka)(mdrflNBGak03.145.01025.12011.1453.2989.15975.3335底层墙重取 B=2m 9.2 基础承载力验算9.2.1 A轴持力层承载力验算基底平均压力:22/11.145/80.8945.01025.12023.2989.15975.3335mkNfmkNAGFpakkk222/13.1742.1/481.10023.298.011.3932.61680.896mkNfmkNlBhVMAGFwMAGFpa
4、kkkkkkkkMax综上,持力层地基承载力满足。9.3 A 轴基础梁设计9.3.1 基础梁荷载计算表 9-3 A 轴内力(恒+活设计值)统计框架轴编号1,7(1.35恒载+0.71.4 活载)2,3,4,5,6(1.35恒载+0.71.4 活载)M(kNm)8.4612.08N(kN)471.25673.21V(kN)-5.39-7.70mkNM32.77508.12246.8kNN55.4308521.673225.471kNV28.4957.7239.5mkNLNPa/05.1473.2955.43089.3.2 基础梁内力计算按连续梁求基础梁的内力,又由于基础梁及柱下竖向荷载均为对称,
5、故在计算中利用其对称性,以加速计算过程。按规范规定,在比较均匀的地基上,上部结构刚度较好,荷载分布较均匀,条形基础梁的高度不小于1/6 柱距时,地基反力可按直线分布,条形基础梁的内力可按倒置的连续梁计算,即倒梁法。(1)固端弯矩计算mKNqlM.24.9715.105.1472/12/12212mKNMqlM.60.32324.972/15.405.1478/12/18/1212221mKNqlMMMM.15.2485.405.1471211212243343223(2)弯矩分配计算按连续梁计算基础梁内力的过程列于下表中。表 9-4 基础梁内力计算表计算简图支座1234 分配系数0.430.5
6、7 0.50.5 固端弯距Mg(kN m)-97.24 323.60-248.15 248.15-248.15 248.15运算-32.33-2.31-0.22-43.01-21.505.38 10.75 -3.07 -1.540.39 0.77-0.22 -0.11 0.06 10.75 5.380.77 0.39 0.06 支座弯矩(kNm)-97.24 288.74-288.68 236.58-236.57 253.92跨中弯矩(kNm)179.23 109.59 126.98弯矩图(kNm)(3)求支座剪力支座剪力计算剪力位置剪力值LV111.16915.105.1471LVRV131
7、.2882/5.405.1475.4/)74.28824.97(1RVLV213.4032/2.47.1715.4/)24.9774.288(2LVRV244.3422/5.405.1475.4/)58.23668.288(2RVLV328.3192/5.405.1475.4/)68.28858.236(3LVRV301.3272/5.405.1475.4/)92.25357.236(3RVLV472.3342/5.405.1475.4/)57.23692.253(3RV(4)求支座反力支座反力计算42.45731.28811.1691R)(221KNlMMplV57.74544.34213.
8、4032R29.64601.32728.3193R44.669272.3344R(5)初步计算剪力图(6)弯矩调整计算计算“支座反力”与原柱传来的竖向力相差超过5%,边榀柱相差457.42-417.25=40.17kN,中榀柱相差 745.57-673.21=72.36 kN 646.29-673.21=-26.92kN,669.44-673.21=-3.77KN 把该差值均布分布在相应柱的两侧各 1/3 跨内作为调整反力,按连续梁计算调整内力q1=40.17/2.65=15.16 kN/m ();q2=72.36/3=24.12 kN/m ();q3=26.92/3=8.97 kN/m ()
9、;q4=3.77/3=1.26 kN/m ()固端弯矩:mKNM.41.1015.116.152/1210mKNM.41.1012mKNMlbqblaqaM.89.3401.506.2184.182/1)/2(8/1)/2(8/112222221mKNlalaqallaqaM.90.1458.1668.1)/(3/86(12/112/)/34(22323mKNlalaqallaqaM.66.117.652.4)/(3/86(12/112/)/34(22332mKNlalaqallaqaM.41.617.624.0)/(3/86(12/112/)/34(22334mKNlalaqallaqaM.
10、54.287.067.1)/(3/86(12/112/)/34(22343表 9-5 基础梁内力调整表计算简图支座1234分配系数 0.430.57 0.50.5 固端弯距Mg(kNm)10.41 -10.41 34.89 -14.90 -1.666.41 -2.54运算 -8.60 -0.81 -0.04-11.39-5.701.42 2.85 -0.81 -0.410.10 0.21-0.06 -0.032.85 1.420.21 0.10 支座弯矩(KN.m)10.41-10.41 28.18-28.53 -6.429.55 0.94弯矩图梁端剪力(KN)-18.1119.76 -27.
11、9926.37 11.22-5.77 4.46剪力图各支座弯矩:mKNM.83.8641.1024.971,mKNM.40.26030.2870.2882mKNM.58.24400.858.2363,mKNM.98.25294.092.2534各支座剪力:mKNVL.00.14911.1811.1671,mKNVR.55.26876.1931.2881mKNVL.14.37599.2713.4032,mKNVR.07.31637.2644.3422mKNVL.50.33022.1128.3193,mKNVR.78.33277.501.3273mKNVL.18.33946.472.3344各支座
12、反力:mKNR.55.41755.26800.1491,mKNR.21.69107.31614.3752mKNR.28.66378.33250.3303,mKNR.36.678218.3394所得结果与原轴力相比相差不大,均不超过5%,满足要求,无需再调整。(7)最终内力图根据规范规定,当按倒梁法进行计算时,此时边跨跨中弯矩及第一内支座的弯矩值宜乘以 1.2 系数。得到最终内力图如下:86.83238.33312.48119.73244.58123.44252.98(198.61)(260.40)图 9-1 倒梁法求得最终弯矩图(kNm)316.07268.55375.14330.50339.
13、18332.78149.00图 9-2 倒梁法求得最终剪力图(kN)9.3.3 基础梁配筋计算(1)正截面配筋计算基础梁截面尺寸取为500mm 800mm;有效高度h0=h-s=800-40=760mm;混凝土强度等级 C30;钢筋为 HPB400 级钢筋。表 9-6 基础梁配筋表支座 1第一跨跨中支座 2第二跨跨中支座 3第三跨跨中支座 4M(kN m)86.83238.33312.48119.73244.58123.44252.4420scMf bh0.0210.0580.076 0.0290.0590.0300.061 112s0.0210.0600.079 0.029 0.061 0.
14、030 0.063 0csybh fAf(mm2)316.98 905.671192.46 437.74920.76 452.83 950.95 选取配筋5 184 185 184 185 184 185 18实际1272101712721017127210171272正截面配筋率:%2.0/45.0%,2.0max%3.08005001017minytff,满足要求。(2)斜截面配筋箍筋采用8,四肢箍。452.1500/760/bhw,KNVKNbhfcc14.37513597605003.140.125.025.0max0,截面尺寸满足要求。KNVKNbhft14.37538.391760
15、50043.17.07.0max0,按构造配筋即可。取3min,1027.1/24.0/yvtsvsvsvffbsA,得191.0/,762.0/1sAsAsvsv。因此,配置8200(近支座处加密8100),此时191.0252.0200/30.50/1sAsv。9.3.4 翼板的承载力计算计算基底净反力,取竖向最大的一个单元进行计算。mkNM32.77508.12246.8kNN55.4308521.673225.471kNV28.4957.7239.5KNlg85.21589.15935.12222/23.71223.298.028.4932.7763.29285.21555.43086
16、/19.83223.298.028.4932.7763.29285.21555.43086MKNLBVHMBLglNPMKNLBVHMBLglNPMinMax9.3.5 计算翼板根部的内力及配筋计算翼板根部内力计算(1)翼板根部的剪力:2minmax/71.78200075023.712000125019.83200075020001250mKNpppxKNPPVx71.60175.02/)71.7819.83(175.02/)(max(2)翼板根部的最大弯矩:mKNPPMx.77.2212/75.02/)71.7819.83(12/75.02/)(22max9.3.6 翼板底部受力钢筋配置翼
17、 板 为250mm-400mm 变 截 面 板,翼 板 根 部 高 度 为400mm,有 效 高 度mmhh360400,所需钢筋面积:26022.1953603609.01077.229.0mmhfMAys选用8200,实际配筋2222.195393mmmm9.3.6 翼板斜截面承载力验算KNVKNbhfc71.6036.360360100043.107.007.00,根部高度满足要求。9.4 基础施工详图9.4.1 翼板施工图200010010025040080050504008200 8200 84006 165 18418A1-11:20100图 9-1 翼板施工图9.4.2 基础平面布置图6005005001150450045004500450045004500115029300100010004400180018004400100010007200720014400100010004400180018004400100010007200720014400115045004500450045004500450011502930033001200123467ABC5基础结构平面布置图1:100图 9-4 基础结构平面布置图