24米桁架式钢引桥强度验算书

75.57×232 + (765×12.9+765×10.1)23= 2784.06 kgР 2、截面选择Р W = ΣM/[σ] = 1933607/1600 = 1208.50 cm3Р 箱形梁抗弯模量:Р W箱=Р 满足要求Р 注:500×300箱形箱的各参数Wx=1775.40 cm3, Ix=57254.58 cm4, Sx = 1185.58, dР =8mm , g=116.31kg/mР 3、截面验算Р (1)强度验算:Р 弯应力σ=Mmax/Wx = 1933607/1775.40 = 1089.11 kg/cm2 < 1600 kg/cm2 b1h126 - b2h22630×5026– 28.4×47.626 = 1775.40 cm3 > 1208.50 cm3 剪应力τ=Р cm2 Q SxIx d=2784.06×1185.5857254.58×0.8=72.06kg/cm2< τ=1000 kg/Р (2)整体稳定性验算:因主纵梁为箱形箱并与横梁上口平齐,且与8mm的面板焊接,整体稳性极好,故可省略不计。Р (3)挠度验算Р f = ??=Р = P+P l(0.75L2?l2)12EI + 5gl4384EI5×175.57×10?2×23004+384×2.1×10 765+765 ×1010×(0.75×23002?10102)Р 12×2.1×10= 7.83cm < [f]=L/250=2300/250=9.20cm,满足规范要求。Р (I= Ix + I28槽= 57254.58 + 4765 =62019.58cm4)Р 卷扬机选择与立柱截面选择计算Р 一、初定立柱门架高5.80米,下净空高5.00米;门架内空宽5.00米。立柱根部截面尺寸1600×1000mm,顶部截面尺寸1000×1000mm.Р 二、