独立基础计算书计算依据：1、《建筑地基基础设计规范》GB50007-20112、《混凝土结构设计规范》GB50010-20103、《建筑结构荷载规范》GB50009-2012一、基本参数1、上部荷载参数5、软弱下卧层2 地基压力扩散角θ(°)23 基础底面至软弱下卧层顶部的距离z(m)160软弱下卧层顶处修正后的地基承载力设计值faz(kPa)二、计算简图平面图剖面图1-1剖面图2-2三、承台验算1、基础受力设计值计算：F=200KNM x′=M x+H1×V x=50+2.4×10=74kN·mM y′=M y+H1×V y=50+2.4×10=74kN·m标准值计算：(标准组合)F k=K s×F=1.3×200=260kNM xk=K s×M x′=1.3×74=96.2kN·mM yk=K s×M y′=1.3×74=96.2kN·m2、基础及其上土的自重荷载标准值：G k=L×B×(γc×h1+ (h′+h2+h3) ×γ′)+L1×B1×h2×(γc-γ′)+(d x×2+a )×(d y×2+b)×h3×(γc-γ′)=3.6×2.8×(24×0.4+ (1.2+0.4+0.4)×17)+2.8×2×0.4×(24-17)+(0.6×2+0.8 ) ×(0.3×2+0.6)×0.4×(24-17)=461.888kN 3、基础底面压应力计算p k = (F k + G k)/A=(260+461.888)/(2.8×3.6)=71.616kPa基础底面抵抗矩：W X= BL2/6=2.8×3.62/6=6.048m3基础底面抵抗矩：W Y= LB2/6=3.6×2.82/6=4.704m3e x=M xk /(F k+G k)=96.2/(260+461.888)=0.133p xkmax= (F k + G k)/A + |M xk|/W x=71.616+96.2/6.048=87.522kPap xkmin= (F k + G k)/A - |M xk|/W x=71.616-96.2/6.048=55.71kPap x增= p xkmax-p k=15.906kPap x减= p k-p xkmin=15.906kPae y=M yk/(F k+G k)=96.2/(260+461.888)=0.133p ykmax= (F k + G k)/A + |M yk|/W y=71.616+96.2/4.704=92.067kPap ykmin= (F k + G k)/A - |M yk|/W y=71.616-96.2/4.704=51.165kPap y增= p ykmax-p k=20.451kPap y减= p k-p ykmin=20.451kPap kmax = p k+ p x增+ p y增=71.616+15.906+20.451=107.973kPap kmin = p k- p x减- p y减=71.616-15.906-20.451=35.259kPa基座反力图1）轴心作用时地基承载力验算P k=71.616kPa≤f a=224.72kPa满足要求！2）偏心作用时地基承载力验算P kmax=107.973kPa≤1.2f a=1.2×224.72=269.664kPa满足要求！4、软弱下卧层验算基础底面处土的自重压力值：p c= H1×γm=2.4×18=43.2kPa下卧层顶面处附加压力值：p z=l b×(p kmax-p c)/((b+2ztanθ)(l+2ztanθ))=3.6×2.8×(107.973-43.2)/((2.8+2×2×tan23)×(3.6+2×2×tan23))=27.399kPa软弱下卧层顶面处土的自重压力值：p cz=z×γ=2×20=40kPa作用在软弱下卧层顶面处总压力：p z+p cz=27.399+40=67.399kPa≤f az=160kPa满足要求！5、基础抗剪切验算P jmax= K c×(p kmax-G k /A) =1.35×(107.973-461.888/(3.6×2.8))=83.904kPa P jmin=0kPa1）第一阶验算抗剪切计算简图一阶X向抗剪切计算简图一阶y向h0x=h1-(δ+φx/2) = 400-(50+10/2)=345mmβhx=(800/ h0x)0.25=1A cx1= Lh0x=3600×345=1242000 mm2V x=0.7×βhx×f t ×A cx1=0.7×1×1.43×1242000=1243242N=1243.242kN≥p jmax×L×(B-B1 )/2=83.904×3.6×(2.8-2)/2=120.822kNh0y=h1-(δ+φy /2)= 400-(50+10/2)=345mmβhy=(800/h0y)0.25=1A cy1=Bh0y= 600×345=207000 mm2V y=0.7×βhy×f t×A cy1=0.7×1×1.43×207000=207207N=207.207kN≥p jmax×B×(L- L1 )/2=83.904×2.8×(3.6-2.8)/2=93.972 kN满足要求！2）第二阶验算抗剪切计算简图二阶X向抗剪切计算简图二阶y向h0x=h1-(δ+φx/2)+ h2 =400-(50+10/2)+400=745mmβhx=(800/h0x)0.25=1A cx2 =L×(h0x-h2) + L1 ×h2=3600×(745-400)+2800×400=2362000 mm2V x=0.7×βhx×f t×A cx2=0.7×1×1.43×2362000=2364362N=2364.362kN≥p jmax×L×(B-(b+2d y ))/2=83.904×3.6×(2.8-0.6-2×0.3)/2=241.644 kNh0y=h1-(δ+φy/2)+ h2 =400-(50+10/2)+400=745mmβhy=(800/h0y)0.25=1A cy2 =B×(h0y-h2) + B1 ×h2=2800×(745-400)+2000×400=1766000 mm2V y=0.7×βhy×f t×A cy2=0.7×1×1.43×1766000=1767766N=1767.766kN≥p jmax×B×(L-(a+2d x ))/2=83.904×2.8×(3.6-0.8-2×0.6)/2=187.945 kN满足要求！3）第三阶验算抗剪切计算简图三阶X向抗剪切计算简图三阶y向h0x=h1-(δ+φx/2) + h2+ h3=400-(50+10/2)+400+400=1145mmβhx=(800/h0x)0.25=0.914A cx3=L×(h0x-h2-h3)+L1×h2+(a+2d x)×h3=3600×(1145-400-400)+2800×400+(800+2×600)×400=3162000 mm2V x=0.7×βhx×f t×A cx3=0.7×0.914×1.43×3162000=2892958.068N=2892.958kN≥p jmax ×L×(B-b)/2=83.904×3.6×(2.8-0.6)/2=332.26kNh0y=h1-(δ+φy/2) + h2+ h3= 400-(50+10/2)+400+400=1145mmβhy=(800/h0y)0.25=0.914A cy3=B×(h0y-h2-h3)+B1×h2+(b+2d y)×h3=2800×(1145-400-400)+2000×400+(600+2×300)×400=2246000 mm2V y=0.7×βhy×f t×A cy3=0.7×0.914×1.43×2246000=2054896.844N=2054.897kN≥p jmax×B×(L-a)/2=83.904×2.8×(3.6-0.8)/2=328.904kN满足要求！6、基础抗冲切验算1）第一阶验算k=(L1 -B1 )/2=(2800-2000)/2=400mmX方向验算：抗冲切验算一阶X向a bx=2h0x +L1=2×345+2800=3490 mm≤L=3600mm，取a bx=2h0x+L1=3490 mmy1= L/2-k=3600/2-400 =1400 mm≥B/2=1400 mmx1=2×(B/2+k) =2×(2800/2+400) =3600 mmy2=h0x +B1/2=345+2000/2 =1345 mmA lx=(B/2-y2)(a bx+x1)/2 = (2800/2-1345)( 3490+3600)/2=194975 mm2Y方向验算：抗冲切验算一阶y向a by=2h0y+B1=2×345+2000=2690mm≤B=2800mm，取a by=2h0y+B1=2690mmx1= B/2+k= 2800/2+400=1800 mm≥3600/2=1800 mmy1=2×(L/2-k) =2×(3600/2-400)=2800 mmx2= h0y +L1/2=345+2800/2=1745mmA ly= (L/2-x2)(a by+y1)/2 = (3600/2-1745)(2690+2800)/2=150975mm2a mx=(a t +a bx)/2=(2800+3490)/2=3145mma my=(a t +a by)/2 =(2000+2690)/2=2345mmA q1x=a mx×h0x=3145×345=1085025 mm2A q1y=a my×h0y=2345×345=809025 mm2F lx=0.7×βhp ×f t ×A q1x=0.7×1×1.43×1085025=1086110.025N=1086.11kN≥p jmax ×A lx=83.904×0.001×194975=16359.182N=16.359kNF1y=0.7×βhp×f t ×A q1y=0.7×1×1.43×809025=809834.025N=809.834kN≥p jmax ×A ly=83.904×0.001×150975=12667.406N=12.667kN满足要求！2）第二阶验算k=((a+2d x) -(b+2d y) )/2=((800+2×600)-(600+2×300))/2=400mmX方向验算：抗冲切验算二阶X向a bx=2h0x +(a+2d x)=2×745+(800+2×600)=3490 mm≤L=3600mm，取a bx=2h0x+(a+2d x)=3490 mmy1= L/2-k=3600/2-400 =1400 mm≥B/2=1400 mmx1=2×(B/2+k) =2×(2800/2+400) =3600 mmy2=h0x +(b+2d y)/2=745+(600+2×300)/2 =1345 mmA lx=(B/2-y2)(a bx+x1)/2 = (2800/2-1345)( 3490+3600)/2=194975 mm2Y方向验算：抗冲切验算二阶y向a by=2h0y+(b+2d y)=2×745+(600+2×300)=2690mm≤B=2800mm，取a by=2h0y+(b+2d y)=2690mmx1= B/2+k= 2800/2+400=1800 mm≥3600/2=1800 mmy1=2×(L/2-k) =2×(3600/2-400)=2800 mmx2= h0y +(a+2d x)/2=745+(800+2×600)/2=1745mmA ly= (L/2-x2)(a by+y1)/2 = (3600/2-1745)(2690+2800)/2=150975mm2a mx=(a t +a bx)/2=(2000+3490)/2=2745mma my=(a t +a by)/2 =(1200+2690)/2=1945mmA q1x=a mx×h0x=2745×745=2045025 mm2A q1y=a my×h0y=1945×745=1449025 mm2F lx=0.7×βhp ×f t ×A q1x=0.7×1×1.43×2045025=2047070.025N=2047.07kN≥p jmax ×A lx=83.904×0.001×194975=16359.182N=16.359kNF1y=0.7×βhp×f t ×A q1y=0.7×1×1.43×1449025=1450474.025N=1450.474kN≥p jmax ×A ly=83.904×0.001×150975=12667.406N=12.667kN满足要求！3）第三阶验算k=(a -b )/2=(800-600)/2=100mmX方向验算：抗冲切验算三阶X向a bx=2h0x+a=2×1145+800=3090 mm≤L=3600mm，取a bx=2h0x+a=3090 mm y1= L/2-k=3600/2-100 =1700 mm≥B/2=1400 mmx1=2×(B/2+k) =2×(2800/2+100) =3000 mmy2=h0x +b/2=1145+600/2 =1445 mmA lx=(B/2-y2)(a bx+x1)/2 = (2800/2-1445)( 3090+3000)/2=-137025 mm2因为A lx＜0，即A lx不存在，故取A lx=0Y方向验算：抗冲切验算三阶y向a by=2h0y+b=2×1145+600=2890mm> B=2800mm，取a by=B=2800mmx2= h0y +a/2= 1145 +800/2=1545mmA ly= (L /2- x2) ×a by= (3600 /2- 1545) ×2800=714000mm2a mx=(a t +a bx)/2=(800+3090)/2=1945mma my=(a t +a by)/2 =(600+2800)/2=1700mmA q1x=a mx×h0x=1945×1145=2227025 mm2A q1y=a my×h0y=1700×1145=1946500 mm2F lx=0.7×βhp ×f t ×A q1x=0.7×0.914×1.43×2227025=2037536.351N=2037.536kN≥p jmax×A lx=83.904×0.001×0=0N=0kNF1y=0.7×βhp×f t ×A q1y=0.7×0.914×1.43×1946500=1780880.101N=1780.88kN≥p jmax ×A ly=83.904×0.001×714000=59907.456N=59.907kN满足要求！四、承台配筋计算承台底部X轴向配筋HRB335Ф10@120承台底部Y轴向配筋HRB335Ф10@110基础底板受力配筋图P j= K c ×(p k-G k /A) =1.35×(71.616-461.888/(3.6×2.8))=34.822kPa1）第一阶验算M1x=1/48[(p jmax+ p j) ×(2L+ L1)+ (p jmak-p j) ×L] ×(B -B1)2 =1/48×[(83.904+ 34.822) × (2×3600+ 2800)+ (83.904-34.822 ) ×3600] ×(2800- 2000)2=18.186 kN·m M1y=1/48[(p jmax+ p j) ×(2B+ B1)+ (p jmak-p j) ×B] ×(L -L1)2 =1/48×[(83.904+ 34.822) × (2×2800+ 2000)+ (83.904-34.822 ) ×2800] ×(3600- 2800)2=13.863 kN·mA sx1=M1x/(0.9×f yx ×h0x ) =18.186×106/(0.9×300×345)=195.233mm2A sy1=M1y/(0.9×f yy ×h0y ) =13.863×106/(0.9×300×345)=148.824mm22）第二阶验算M2x=1/48[(p jmax+ p j) ×(2L+ (a+2d x))+ (p jmak-p j) ×L] ×(B -(b+2d y))2 =1/48×[(83.904+ 34.822) × (2×3600+ (800+2×600))+ (83.904-34.822 ) ×3600] ×(2800-(600+2×300))2=67.679 kN·mM2y=1/48[(p jmax+ p j) ×(2B+ (b+2d y))+ (p jmak-p j) ×B] ×(L -(a+2d x))2=1/48×[(83.904+ 34.822) × (2×2800+ (600+2×300))+ (83.904-34.822 ) ×2800] ×(3600- (800+2×600))2=50.388 kN·mA sx2=M2x/(0.9×f yx ×h0x ) =67.679×106/(0.9×300×745)=336.46mm2A sy2=M2y/(0.9×f yy ×h0y ) =50.388×106/(0.9×300×745)=250.5mm23）第三阶验算M3x=1/48[(p jmax+ p j) ×(2L+ a)+ (p jmak-p j) ×L] ×(B -b)2 =1/48×[(83.904+ 34.822) ×(2×3600+ 800)+ (83.904-34.822 ) ×3600] ×(2800- 600)2=113.589 kN·m M3y=1/48[(p jmax+ p j) ×(2B+ b)+ (p jmak-p j) ×B] ×(L -a)2 =1/48×[(83.904+ 34.822) ×(2×2800+ 600)+ (83.904-34.822 ) ×2800] ×(3600- 800)2=142.677 kN·mA sx3=M3x/(0.9×f yx ×h0x ) =113.589×106/(0.9×300×1145)=367.424mm2A sy3=M3y/(0.9×f yy ×h0y ) =142.677×106/(0.9×300×1145)=461.514mm2A sx=max(A sx1，A sx2，A sx3)=max(195.233，336.46，367.424)=367.424mm2≤A SX=[（2800/120）+1]×3.14×102/4=1910.167 mm2A sy=max(A sy1，A sy2，A sy3)=max(148.824，250.5，461.514)=461.514mm2≤A SY=[（3600/110）+1]×3.14×102/4=2647.591 mm2 满足要求！。