1、1600.00340.00非工作状态850.0070.001800.00比较桩基础塔吊的工作状态和非工作状态的受力情况,塔吊基础按非工作状态计算如图Fk=850.00kN,Fh=70.00kNM=1800.00+70.001.40=1898.00kN.mFk,=850.001.35=1147.50kN,Fh,=70.001.35=94.50kNMk=(1800.00+70.001.40)1.35=2562.30kN.m2)桩顶以下岩土力学资料序号地层名称厚度L(m)极限侧阻力标准值qsik(kPa)极限端阻力标准值qpk(kPa)qsiki(kN/m)抗拔系数iiqsik1砂质粘土3.0035
2、.001.00105.000.7073.50i=3.140.401145.00=1438.12kNQpk=qpk(Aj+pApl)=4500.00(0.09+0.400.03)=459.00kN,Quk= QskQpk=1438.12+459.00=1897.12kNRa=1/KQuk=1/21897.12=948.56kN(2)桩基竖向承载力计算1)轴心竖向力作用下Nk=446.88kNRa=948.56kN,竖向承载力满足要求。2)偏心竖向力作用下Nkmax=1005.12kNRa=1.2948.56=1138.27kN,竖向承载力满足要求。4.桩基水平承载力验算(1)单桩水平承载力特征值
3、计算I=(d4-d14)/64=3.14(0.404-0.204)/64=0.0012m4EI=EcI=3.801070.0012=45600kN.m2查表得:m=6.00103kN/m4, Xoa=0.010mbo=0.9(1.5d+0.5)=0.99m=990mm=(mbo/ ECI)0.2=(6.0010000.99/45600)0.2=0.67L=0.6713.00=8.714,按L=4,查表得:x=2.441RHa=0.75(3EI/x)oa=0.75(0.67345600/2.441)0.01=42.14kN(2)桩基水平承载力计算Hik=17.50kNRha=42.14kN,水平
4、承载力满足要求。5.抗拔桩基承载力验算(1)抗拔极限承载力标准值计算Tgk=1/nu1iqsikLi=1/4(1.202+0.40)4801.50=2244.20kNTuk=iqsikuiLi=801.503.140.40=1006.68kN(2)抗拔承载力计算Ggp=Ggp1Ggp2=5.005.001.0018.80/45.0011.90(18.80-10)/4=772.00kNGp=Gp1Gp2=0.091.10250.09(25-10)=18.54kNTgk/2+Ggp=2244.20/2+772.00=1894.10kNNkmin=111.37kN,基桩呈整体性破坏的抗拔承载力满足要
5、求。Tuk/2+Gp=1006.68/2+18.54=521.88kNNkmin=111.37kN,基桩呈非整体性破坏的抗拔承载力满足要求。6.抗倾覆验算a1=5.00/2=2.50m,bi=5.00/2+1.20=3.70m倾覆力矩M倾=MFhh=1800+70.00(2.000.50)=1905.00kN.m抗倾覆力矩M抗=(FkGk)ai2(Tuk/2+Gp)bi=(850.00+937.50)2.50+2(1006.68/2+18.54)3.70=8330.66kN.mM抗/M倾=8330.66/1905.00=4.37抗倾覆验算4.371.6,满足要求。7.桩身承载力验算(1)正截面
6、受压承载力计算按照Mx作用在对角线进行计算,Mx=Mk=2562.30kN.m,yi=1.2020.5=1.70mNk=(Fk1.2Gk)/nMxyi/yi2=(1147.50+1.2937.50)/4(2562.301.70)/(21.702) =568.13753.62Nkmax=1321.75kN,Nkmin=-185.50kNc=0.85,cfcAj=0.8535.900.09=2746.35kN正截面受压承载力=2746.35kNNkmax=1321.75kN,满足要求。(2)预制桩插筋受拉承载力验算插筋采用HRB335,fy=300.00N/mm2,取6 20,As=6314=18
7、84mm2fyAs=3001884=565200N=565.20kN fyAs=565.20kNNkmin=185.50kN,正截面受拉承载力满足要求。M倾/(4x1As)=1905.001000/(41.201884)=210.66N/mm2M倾/(4x1As)=210.66N/mm2300.00N/mm2,满足要求。(3)承台受冲切承载力验算1)塔身边冲切承载力计算F=F1.2Qik=Fk,=1147.50kN,ho=1.50-0.10=1.40m=1400mmhp=1.0+(2000-1500)/(2000-800)(0.9-1.0)=0.960=1.20-0.40/2-1.70/2=0
8、.15m,=0/ho=0.15/1.40=0.11,0.25,=0.250=0.84/(+0.2)=0.84/(0.25+0.2)=1.87um=4(1.70+1.40)=12.40mhp0umftho=0.961.8712.401.571.40=48928.54kN承台受冲切承载力=48928.54kNF=1147.50kN,满足要求。2)角桩向上冲切力承载力计算N1=Nk,=Fk,/n+ Mxyi/yi2=1147.50/4+2562.301.70/(21.702)=1040.49kN1x=1y=0/ho=0.15/1.40=0.11,0.25,=0.25,c1=c2=1.30+0.20=
9、1.50mV=2Nk,=21040.49=2080.99kN1x=1y=0.56/(1x+0.2)=0.56/(0.25+0.2)=1.241x(c2+1y/2)+1y(c1+1x/2)hpftho=1.24(1.50+0.15/2)20.961.40=8241.97kN角桩向上冲切承载力=8242.0kNV=2080.99kN,满足要求。3)承台受剪切承载力验算Nk,=Fk,/n+ Mxyi/yi2=1147.50/4+2562.301040.49=2080.98kNhs=(800/ho)1/4=(800/1400)0.25=0.87,=0/ho=0.15/1.40=0.11,0.25,=0
10、.25=1.75/(+1)=1.75/(0.25+1)=1.40,b0=5.00m=5000mmhsftb0ho=0.871.401.40=13385.82kN承台受剪切承载力=13385.82kNV=2080.98kN,满足要求。(4)承台抗弯验算1)承台弯矩计算Ni=Fk,/n+ Mxyi/yi2=1147.50/4+2562.301.702)=1040.49kN,Xi=1.20mM=NiXi=21040.491.20=2497.18kN.m2)承台配筋计算承台采用HRB335,fy=300.00N/mm2As=M/0.9fyho=2497.18106/(0.93001400)=6606mm2取25 25 197mm (钢筋间距满足要求),As=25491=12275mm2承台配筋面积12275mm27000mm2,满足要求。8.计算结果(1)基础桩4根400 预应力管桩,桩顶标高-1.90m,桩长13.00m;桩混凝土等级C80,壁厚100mm,桩顶插筋6 20。(2)承台长(a)=5.00m,宽(b)=5.00m,高(h)=1.50m ,桩中心与承台中心1.20m,承台面标高-0.50m;混凝土等级C35,承台底钢筋采用双向25 25197mm。(3)基础大样图塔吊基础平面图塔吊基础剖面图
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