百度文库-让每个人平等地提升自我11塔吊附墙杆选型及计算1、附墙杆轴向力计算(包括剪力)11128.3628.36391.93nXYFFCOSFSinKn(二根杆)22240.57COS40.57388.44nXYFFSinFKn(二根杆)V11128.36COS28.3614.97XYFFSinFKn(二根杆)V22140.57COS40.5742.96XYFFSinFKn(二根杆)2、附墙杆选材选Q235钢材,f=215N/mm2,fV=125N/mm2,fce=325N/mm2所需的附墙杆截面面积为321F391.9310A911.4722215nmmf需3、附墙杆截面形式选择选每根附墙杆由4个角钢组成,型号为L63×6,截面特性计算:A=×4=29.16cm2>A需=911.4mm2Ix=×4+×2440(1.78)49788.682cmix=9788.6818.3229.16cm附墙杆所受的外力计算(取附墙杆1所受的外力,附墙杆每米重量取为50Kg/m)221150015.5215054.4.88XMqlNm221150015.5215054.4.88XMqlNm111391.93195.97.22nNFNm11142.9621.4822VVFKn4、斜缀条受力计算(取斜缀夹角为45°)假想剪力229.162151073767.388523585yfAfVNKn<实际剪力V=缀条内力及长度计算:45NC=21.4815.19245KNCOS280396cos45lmm选用L40×4角钢,A=3.09cm2,ix=1.22cm,百度文库-让每个人平等地提升自我2239632.4612.2<[]150,取n=,查表知,0.927验算缀条稳定:322215.191053.03/2150.85183/0.9273.0910CNNmmfNmmA所以缀条满足要求。5、验算附墙杆弯距作用平面内的整体稳定。01552084.72183.2xxxli换算长细比,22012784.7227485.36xxAA<[]150查附表(b类截面),0.652xNEX=22522202.061029.16101.11.185.36xFA=73970N取1.0mx,39788.68489.4320XXIWcmy23115054.4103.08103.04/489.4310(0.72)(1)mxXXXXEXMNNmmNAWN