12 多層鋼筋混凝土框架基礎(chǔ)設(shè)計(jì)畢業(yè)論文.doc

東南大學(xué)畢業(yè)設(shè)計(jì)-89-十二基礎(chǔ)設(shè)計(jì)基礎(chǔ)類型采用混凝土預(yù)制樁基礎(chǔ)。（一）邊柱基礎(chǔ)1荷載標(biāo)準(zhǔn)組合值計(jì)算計(jì)算過程見下表（單位：M為kNm，N和V為kN）底層截面恒荷載活荷載(屋面布雪載)活荷載(屋面布活載)MNMNMN邊柱255.8918449.972589.97298120.7219013.692583.69298中柱2-45.12173-7.7403-7.74621-16.42230-2.8403-2.8462底層截面風(fēng)荷載(左風(fēng))地震作用(左震)+0.5+MNMNMN邊柱2-35-35-145-188.8-84.281784.101-57.2-35-271-188.8-248.131840.97中柱2-51.3-37-191-193.5-239.992181.601-63-37-326-193.5-343.382238.47底層截面+0.5-+MmaxNmaxVmaxMNMN邊柱2206.032161.6065.862141.98206.032161.6094.201293.262218.4724.412198.85293.262218.47中柱2142.092568.50-52.792635.70239.992635.70110.071307.722625.37-19.232692.57343.382692.57從上表可知，F(xiàn)k=2218.47kN，Mk=293.26kNm，Hk=94.21kN2基本尺寸與樁數(shù)確定暫取承臺(tái)高度為0.8m，埋深1.3m，樁徑采用350350mm，均采用C30混凝土。配置HRB335級(jí)鋼筋。樁有效長(zhǎng)度為20m，進(jìn)入持力層1.3+20-19.7=1.6m。單樁承載力標(biāo)準(zhǔn)值：東南大學(xué)畢業(yè)設(shè)計(jì)-90-6).1463.8363.7278.214(435.035.035.03600lqUAqRisikpppkk1293.18kN18.852441特征值：646.59kN2/1293.18Ra所需樁數(shù)：77.3646.5947.22181.1n，選用4根樁邊樁中心至承臺(tái)邊緣取d=350mm樁距取3d=1050mm.樁布置如下圖（單位：mm）承臺(tái)尺寸為1750mm1750mm3樁頂作用效應(yīng)計(jì)算72kN.74543.10.20.2202.108.2858nGFN單樁承載力設(shè)計(jì)值：N1148.16kN65.1/57626.165.1/973.922.1/Q/Q/QRcckcppkpssks在彎矩作用下120.0772.74505.1405.1)8.062.15698.378(72.745xx)HhM(NN22maxmin066.6251377.79kN2R.1865.79滿足要求。4承臺(tái)設(shè)計(jì)樁頂最大反力設(shè)計(jì)值Nmax=850.78kN平均反力設(shè)計(jì)值N=745.72kN東南大學(xué)畢業(yè)設(shè)計(jì)-91-樁頂凈反力設(shè)計(jì)值Nmax=850.78-G/n819.58kN平均凈反力設(shè)計(jì)值N=745.72-G/n=714.52kN因?yàn)榛A(chǔ)底面落在沖切破壞錐體以內(nèi)，故可不進(jìn)行受沖切驗(yàn)算。（1）斜截面承載力計(jì)算計(jì)算截面處的剪力設(shè)計(jì)值16kN.1639258.819V剪跨比3.011.0715.0075.0，取=0.3剪切系數(shù)2.03.03.012.0V6kN.3578715.075.110003.142.0hbf00c滿足要求（2）受彎承載力計(jì)算計(jì)算截面處的彎矩設(shè)計(jì)值m328kN2.058.8192M026.071517503.141032826s026.02s1548mm300026.071517503.14A配置18200，實(shí)配2227mm2同理，在另外一個(gè)方向也配置18200。（二）中柱基礎(chǔ)1荷載標(biāo)準(zhǔn)組合值計(jì)算計(jì)算過程見下表從上表可知，F(xiàn)k=2692.57kN，Mk=343.38kNm，Hk=110.07kN2基本尺寸與樁數(shù)確定暫取承臺(tái)高度為0.8m，埋深1.3m，樁徑采用400400mm，均采用C30混凝土。配置HRB335級(jí)鋼筋。樁有效長(zhǎng)度為20m，進(jìn)入持力層1.3+20-19.7=1.6m。單樁承載力標(biāo)準(zhǔn)值：6).1463.8363.7278.214(44.04.04.03600lqUAqRisikpppkk1549.92kN92.973576東南大學(xué)畢業(yè)設(shè)計(jì)-92-特征值：774.96kN2/92.1549Ra所需樁數(shù)：82.3774.962692.571.1n，選用4根樁邊樁中心至承臺(tái)邊緣取d=400mm樁距取3d=1200mm.樁布置如下圖承臺(tái)尺寸為2000mm2000mm3樁頂作用效應(yīng)計(jì)算19kN.89743.10.20.2202.195.3463nGFN單樁承載力設(shè)計(jì)值：N1148.16kN65.1/57626.165.1/973.922.1/Q/Q/QRcckcppkpssks在彎矩作用下25.12819.8972.142.1)8.0183.7561.444(19.897xx)HhM(NN22maxmin094.76879kN.13772R.144.1025滿足要求。4承臺(tái)設(shè)計(jì)樁頂最大反力設(shè)計(jì)值Nmax=1025.