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1悬挑卸料平台设计计算1.计算参数设定(1).基本参数卸料平台宽度2.00m,长度3.00m,楼层高度3.60m;悬挑主梁采用2根I16工字钢,次梁采用I14工字钢,间距500mm;施工堆载、活荷载3.00kN/m2;平台上满铺木枋格栅,采用钢丝绳卸荷。钢材抗拉和抗弯强度设计值f=215.00N/mm2,抗剪设计强度fv=120.00N/mm2,钢材屈服点fy=235N/mm2,弹性模量E=206000N/mm2。(2).荷载标准值1)永久荷载标准值脚手板采用木枋格栅面铺木板,自重标准值:0.38kN/m22)施工均布活荷载标准值施工堆载、活荷载3.00kN/m22.次梁验算次梁采用I14工字钢;H=140mm,b=80mm,t=9.1mm,tw=5.5mm,Wx=101700mm3,Ix=7120000mm4,S=58400mm3次梁按单跨简支梁计算,跨度L=3.00m(1)荷载计算次梁自重GK1=0.17kN/m;脚手板自重GK2=0.38×0.50=0.19kN/m;施工活荷载QK=施工堆载、活荷载×次梁间距=3.00×0.50=1.50kN/m;作用于次梁上的线荷载标准值永久荷载q1=1.2GK=1.2×(0.17+0.19)=0.43kN/m施工活荷载q2=1.4QK=1.4×1.50=2.10kN/mQ=q1+q2=0.43+2.10=2.53kN/m,集中荷载P=2.50kN(2)抗弯强度验算γx=1.05;Mmax=qL2/8+PL/4=2.53×3.002/8+2.50×3.00/4=4.72kN·m=4720000N·mmσ=Mmax/γxW=4720000/(1.05×101700)=44.21N/mm2;次梁抗弯强度σ=44.21N/mm2<[f]=215.00N/mm2,满足要求。(3)抗剪强度验算Vmax=qL/2+P/2=2.53×3.00/2+2.50/2=5.05kN=5045Nτ=VmaxS/IxtW=5045×58400/(5.5×7120000)=7.52N/mm2次梁抗剪强度τ=7.52N/mm2<[fv]=120.00N/mm2,满足要求。2(4)整体稳定性验算b=1.120.6;'b=1.07-(0.282/b)=1.07-(0.282/1.12)=0.82f=Mmax/('bW)=4.72×106/(0.82×101700)=56.60N/mm2次梁整体稳定性f=56.60N/mm2<[f]=215.00N/mm2,满足要求。(5)挠度验算υq=5qL4/(384EIx)=5×2.53×30004/(384×206000×7120000)=1.82mmυp1=PL3/(48EIx)=2.50×1000×30003/(48×206000×7120000)=0.96mmυmax=υq+υp1=1.82+0.96=2.78mm,[υ]=L/250=3000/250=12.00mm次梁挠度υmax=2.78mm<[υ]=12.00mm,满足要求。3.主梁验算主梁采用2根I16工字钢;H=160mm,b=88mm,tw=6.0mm,t=9.9mm,Wx=140900mm3,Ix=11270000mm4,S=80800mm3主梁和栏杆自重q=0.2050+0.07=0.28kN/mP2=V=qL/2=2.53×3.00/2=3.80kN,P1=P2/2=3.80/2=1.90kN,P3=P/2=2.50/2=1.25kN次梁间距C=500mmn=L/C=4(1)抗弯强度验算Mmax=qL2/8+P2Ln/8+P3L/4=(0.28×2.002/8)+(3.80×2.00×4.00/8)+(1.25×2.00/4)=4.57kN·mγx=1.05;σ=Mmax/γxW=4.57×106/(1.05×140900)=30.89N/mm2主梁抗弯强度σ=30.89N/mm2<[f]=215.00N/mm2,满足要求。(2)抗剪强度验算Vmax=qL/2+P2(n-1)/2+P3/2=0.28×2.00/2+3.80×(4-1)/2+1.25/2=6.61kNτ=VmaxS/IxtW=6.61×103×80800/(11270000×10)=4.74N/mm2主梁抗剪强度τ=4.74N/mm2<[fv]=120.00N/mm2,满足要求。(3)整体稳定验算b=2.000.6;'b=1.07-(0.282/b)=1.07-(0.282/2.00)=0.93f=Mmax/('bW)=4.57×106/(0.93×140900)=34.88N/mm2主梁整体稳定性f=34.88N/mm2<[f]=215.00N/mm2,满足要求。(4)挠度验算υq=5qL4/(384EIx)=5×0.28×20004/(384×206000×11270000)=0.03mmυp1=(5n2-4)P2L3/(384nEI)=(5×42-4)×3800×20003/(384×4×206000×11270000)=0.65mmυp2=P3L3/(48EI)=1.25×20003/(48×206000×11270000)=0.09mmυmax=υq+υp1+υp2=0.03+0.65+0.09=0.77mm;[υ]=L/250=2000/250=8.00mm主梁挠度υmax=0.77mm<[υ]=8.00mm,满足要求。4.钢丝绳验算3NT吊点高度h=3.60m,吊点宽度L=2.00mN=V+P1=6.61+1.90=10.41kN采用Φ20mm钢丝绳,K'=0.356,α=0.85,K=7.00破断拉力总和F破=K'D2Ro/1000=0.356×202×1670/1000=237.81kN钢丝绳允许拉力[P]=F破α/K=237.81×0.85/7.00=28.88kNT=N×(h2+L2)0.5/h=10.41×(3.602+2.002)0.5/3.60=11.91kN钢丝绳承受拉力T=11.91kN<[P]=28.88kN,满足要求5.钢筋拉杆的验算钢筋拉杆采用Φ20mmHPB235级钢筋制作,As=3.14×(20/2)2=314.00mm2,f=205N/mm2钢筋拉杆承受的拉力为:N拉=T=11.91kN钢筋拉杆可承受的拉力:fAs=205×314.00/1000=64.37kN钢筋拉杆可承受的拉力64.37kN>N拉=11.91kN,满足要求。6.花篮螺栓的验算花篮螺栓采用Φ30mm的CO型,花篮螺栓容许荷载N=25×30×30/1000=22.50kN花篮螺栓容许荷载22.50kN>N拉=11.91kN,满足要求。7.吊环验算两根钢丝绳分别设置吊环,吊环采用Φ20mmHPB235级钢筋制作,As=3.14×(20/2)2=314mm2,f=65N/mm2最大吊环承受的拉力为:N拉=T=11.91kN吊环可承受的拉力:fAs=65×2×314/1000=40.82kN吊环强度40.82kN>N拉=11.91kN,满足要求8.悬挑梁锚固钢筋验算HPB235钢筋,fy=210N/mm2,锚固点拉力R=V+P1=6.61+(3.80/2)=8.51kN=8510N预埋锚固钢筋按两个截面同时受力计算:取φ14As=2×3.14×142/4=307.72mm2,Nm/As=8510/307.72=27.66N/mm2锚固钢筋27.66N/mm2<65N/mm2,满足要求。9.计算结果卸料平台宽度2.00m,长度3.00m,楼层高度3.60m;平台上满铺木枋格栅。次梁采用I14工字钢,间距500mm;悬挑主梁采用2根I16工字钢,工字钢悬挑梁端部设置吊索为Φ20mm(6×19)钢丝绳,采用Φ30mm的CO型花篮螺栓,Φ14mm锚固钢筋,Φ20mm吊环设置在上层楼面梁上。4
本文标题:悬挑卸料平台计算
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