基础

钢筋混凝土柱基础设计条件:1地面以下:d=2m2柱脚:1000X1000混凝土:C203荷载:N=1847.40kNMX=777.43kN.MVX=113.39kN4基础埋深:d+h=3.00m5地基承载力标准值:fk=300kPa6基底保护层:50mm有关参数:h1=0h2=0g1=18kN/m3g2=20kN/m3ft=1.1N/mm2fc=10N/mm2一级钢筋fy=210N/mm2二级钢筋fy=310N/mm2基础设计:a=1000mmb=1000mmh=1000mma1=600mmb1=600mmh1=400mma2=500mmb2=500mmh2=300mma3=400mmb3=400mmh3=300mmL=4000mmB=4000mmA=L*B=16m2Wx=L*B2/6=10.667m3Mx=V*h+M=113.4+777.4=890.8kN.mf=fk+h1*g1(B-3)+h2*g2(d-0.5)=300.0+0+0=300.0kPa1.1fk=330kPa则：f=330.0kPa基底压力验算:G=g2*A*(d+h)=960.00kNe=Mx/(N+G)=317mmB/6=667mm且:B-3(B/2-e)=0mmB/4=1000mmOK!Ps=(N+G)/A=175.46kPaf=330kPaPsmax=(N+G)/A+Mx/Wx=258.98kPa1.2f=396kPaPsmin=(N+G)/A-Mx/Wx=91.95kPaOK!冲切验算:H01=h01=350mmAL1=(b1-H01)*[b1+H01+(a+2a2+2a3)]=0.9375m2FL1=Psmax*AL1=242.8kNam1=a+a2+a3+H01=2250mmFL1/(0.6ft*am1)=163mmH01OK!H02=h01+h2=650mmAL2=[(b1+b2)-H02]*[(b1+b2)+H02+(a+2a3)]=1.5975m2FL2=Psmax*AL2=413.7kNam2=a+a3+H02=2050mmFL2/(0.6ft*am2)=306mmH02OK!H03=h0=950mmAL3=[(b1+b2+b3)-H03]*[(b1+b2+b3)+H03+a]=1.8975m2FL2=Psmax*AL3=491.4kNam3=a+h03=1950mmFL3/(0.6ft*am3)=382mmH03OK!剪切验算:V=(Pnmax+Ps1)*(b1-h01)*b/2=246.45kN0.07fcbh01=980kNV0.07fcbh01OK!板底配筋:X:Ps1=233.92kPaPs2=213.04kPaPs3=196.34kPaM1-1=[(Psmax+Ps1-2G/A)/2]*b12*(3L-2a1)/6=186.45*0.360*1.800=120.82kN.mM2-2=[(Psmax+Ps2-2G/A)/2]*(b1+b2)2*[3L-2(a1+a2)]/6=176.01*1.210*1.633=347.86kN.mM3-3=[(Psmax+Ps3-2G/A)/2]*(b1+b2+b3)2*[3L-2(a1+a2+a3)]/6=167.66*2.250*1.500=565.85kN.mAs1-1=M1-1/(0.9h01*fy)=1826mm2(一级钢筋)or1237mm2(二级钢筋)As2-2=M2-2/(0.9h02*fy)=2832mm21918mm2As3-3=M3-3/(0.9h03*fy)=3151mm22135mm2Asmax=788mm2/m534mm2/mAs实际=565mm2/m二级钢筋12@200