板式楼梯梯板自重用平均板厚计算自重后是否还需要除以倾角余弦即1.3.2公式里面是否还需要除Cosα 1.2 楼梯几何参数 1.2.1 踏步高度 hs = Hs / n =1475/9 = 163.9mm 踏步宽度 bs= Lsn / (n - 1) = 2160/(9-1) = 270mm 踏步段斜板的倾角 α = ArcTan(hs / bs) =ArcTan(163.9/270) = 31.3°
1.2 楼梯几何参数
1.2.1 踏步高度 hs = Hs / n =1475/9 = 163.9mm
踏步宽度 bs= Lsn / (n - 1) = 2160/(9-1) = 270mm
踏步段斜板的倾角
α
= ArcTan(hs / bs) =ArcTan(163.9/270) = 31.3°
踏步段斜板的长度Lx = Lsn / Cos
α
= 2160/Cos31.3° =2527mm
1.2.2 踏步段梯板厚的垂直高度 h1' = h1 /Cos
α
= 100/Cos31.3° =117mm
踏步段梯板平均厚度T = (hs + 2h1') / 2 = (163.9+2*117)/2 = 198.9mm
1.2.3 梯板有效高度 h10 = h1 - as= 100-25 = 75mm
1.3 均布永久荷载标准值
1.3.1 梯板上的线载换算为均布恒荷 gk1 = Pk/ B = 1/2.23 = 0.45kN/m2
1.3.2 梯板自重 gk2 =
γb·T
= 25*0.1989 = 4.97kN/m2