粉料仓计算书

.682t附属物重:1.5t2、风载:W=ΒZUsUzWo=51kg/m2 WO基本风压35kg/m2(北京地区十年一遇最大风力) Us<0.7 Uz=1.14βZ=1.83自振周期T=0.56+0.4x10-3(h2/D) h=19.75m D=6m T=0.586s>0.25s?所以考虑风振系数βZ=1+[(ξυφZ)/Uz]=1+[(1.88x0.755x0.665)/1.14]=1.83?风载作用点: S=6x8.7x(8.7/2+4.81)+(6+0.4)x(4.841/20x(4.841x2/3)=480+50=530 A=6x8.7=6.4x4.841/2=67.69 Z=7.8m?风载P=51xA=51x67.69=3452kg2.2;内力:立柱:?N1=(350+21682+1.5)/4=93.3t风载?N拉=N压=(3.452x13.55)/(4.243x2)=5.51t N拉总=93.3+5.51=98.8t N拉=5.51-21.682/4=0.1t斜撑2.3:应力1、立柱:?λ=502.5/13.08=38.41D2+d2 A=116.24cm2φ=0.932i=1/4=13.08?用φ38x10λ=(98.8x103)/(0.932x116.24)=912kg/cm2<1700kg/cm2斜撑①N拉=2.675tλ=328.8/1.57=209<250用?L80x8?A=12.3cm2?λ=2675/1.57=217kg/cm2<250kg/cm2②N压=1.726tλ=424.3/2.44=174>150φ=0.932λ=1726/(0.232x12.3)=605kg/cm2连接件:①斜撑螺栓:M20精制螺栓抗剪承载力4.241t/个?3x4.241t=12.723t②立站: M36地脚螺栓抗剪承载力8.99t/个?4x8.99t=35.96t