1、懸挑腳手架設(shè)計計算書本工程最高處37.9m,采用648x3.0電焊鋼管作立桿,立桿橫距l(xiāng)b=0.9m.立桿縱距l(xiāng)a=1.5m,內(nèi)立腳點桿距建筑物外墻最大距離為b=1.8m,腳手架搭設(shè)步距h=1.8m.每個受力系組懸殊挑九步,考慮同時進行施工層數(shù)為二層.鋪設(shè)竹腳步手笆,外掛塑料編織平安網(wǎng)封閉.腳手架與建筑物立面結(jié)構(gòu)連接點的布置為二步三跨,豎向間距hw=3.6m,水平間距l(xiāng)w=4.5m,每個受力系組的搭設(shè)高度Hi=1.8M9=16.2m.其他計算參數(shù)：A=424mm2i=15.98mm,W=4490mm3擋風(fēng)系數(shù)為中=0.2,鋼材的抗壓強度設(shè)計值Q215fc=0.195KN/mmZ施工層數(shù)n=2.

2、查表得：gK1=0.109KN/m,gK2=0.4112KN/m,gK3=0.0768KN/m,qK=0.9KN/m施工荷載為2KN/m2,lb=0.9m時,穩(wěn)定系數(shù)邛=0.235見后面計算,m=1.521見計算表1 .計算采用單根鋼管作立桿的允許搭設(shè)高度AfccHs=1.1_磯gK11.1qkgK1gK221.50.41121.160.90.2354240.1951.11.5210.1090.0768=38.98mHs38.98H=28.04m16.2m10.01Hs10.0138.98經(jīng)計算,每個受力系組的搭設(shè)高度符合設(shè)計要求2 .荷載標(biāo)準(zhǔn)值的計算(1)恒載的標(biāo)準(zhǔn)值GkGk-Hkgk1&#

3、39;9k3-nl1a9k3=16.20,1090.076821.50.4112=4.243KN(2)活荷載的標(biāo)準(zhǔn)值QkQk=nklaqk=21.50.9風(fēng)荷載的標(biāo)準(zhǔn)值Wk=2.7KNqWk=laWkWk=0.7%wzW0取擋風(fēng)系數(shù)中=0.2查表得NstW0.275NZ=0.8(離地5m)L=1.72(離地25m)通過內(nèi)插法得：也(離地20.35m)=0.8+1.720.8父15.3525-5=1.506Wk=0.70.2750.81.5060.35=0.054(0.101)KN/m2qWk=1.50.20,0540.101=0.016(0.031)KN/m3,腳手架整體穩(wěn)定驗算(1)確定材料

4、強度附加分項系數(shù)4因組合風(fēng)載：m=1.59122MWk-0.1qWkh=0.10.0160.0311.8-5.18KN.mmNWk=0.50.95KNMwkA5.1810.1424W-4490vm值計算表驗算截面作業(yè)類另INGk(KN)Nqk(KN)NWk(KN)n九1'm?=0底部結(jié)構(gòu)裝修4.2342.70.50.6380.1181.5211.36920.35m處結(jié)構(gòu)裝修4.2342.70.950.6380.2241.5161.364(2)計算軸心力設(shè)計值N/N/=1.2NgkNqkKK底部截面：N/=1.24.2342.7=8.321KN20.35m處截面：N/=1.24.2342

5、.7)=8.321KN(3)計算風(fēng)荷載彎矩值Mw底部：Mw=1.2M岫一一一2=1.20.10.0161.8=6.216KN.mm20.35m處:Mw=1.2X0.1X0.031M1.82=12.12KN.mm(4)確定穩(wěn)定系數(shù)查表得立桿計算長度系數(shù)=1.551.551800二17415.98查表得穩(wěn)定系數(shù)=0.235(5)驗算整體穩(wěn)定n.Mw.;二aw-0.9m底部:NMw''AW8.2310.2354246.216=0.08444902mfc0.9m0.1950.91.521=0.142KNmm220.35m處：襄+皿=8.231+1212=0.0852AW0.235424

6、4490mm0.90.1950.91.516=0.143KN2mm經(jīng)計算兩處截面均有：i等f故整體穩(wěn)定4、鋼絲繩平安性驗算P-8.3121038.321-10.4KN1.2_1.2232Tac=10.4=11.2KNTAB=8.32122.2.75.75.7=9.20KNTCD=8.321183.2=9.7KN3.0采用6父19+1015.5的鋼絲繩R=125KN取平安系數(shù)K=8破斷拉力換算系數(shù)二=0.85=13.28KNTAC、Tab、Tcd經(jīng)驗算平安.5、拉墻桿抗滑驗算N=1.4lWhWWK=1.40.23.64.50.101=0.458KN一個扣件的抗滑水平設(shè)計值為8.5KN>0.45