钢楼梯计算:1.几何参数楼梯净跨:nl=3600mm楼梯高度:H=1800mm踢步数:n=10(阶)楼梯宽:b=1480mm下平台宽:1170mm上平台:原混凝土板2.荷载标准值(1)踏步部分:恒荷载:横板:30mm混凝土2250.030.75/kNm4mm钢板2780.0040.312/kNm取20.35/kNm合计:21.1/kNm竖板:2218/271.1/0.73/kNmkNm踏步合计:21.83/kNm折算为斜梯板:221.83/27/32.451.52/kNmkNm防火层按斜梯板取为:20.5/kNm总计:2221.52/0.5/2.02/kNmkNmkNm折算至梯梁:2.021.48/21.5/kNm栏杆荷载:0.20/fqkNm梯梁自重:0.358/kNm故斜梯梁总恒载为:1.50.20.3582.058/kNm取2.5/kNm活荷载:2.5/qkNm斜梁总活载为:2.51.48/227/32.451.54/kNm取1.6/kNm(2)休息平台部分:恒荷载:30mm混凝土2250.030.75/kNm4mm钢板2780.0040.312/kNm取20.35/kNm加劲板取20.2/kNm防火层取20.5/kNm小计:21.8/kNm折算至梯梁上:1.81.48/21.31/kNm梯梁自重:0.358/kNm梯梁总恒载为:1.310.3581.668/kNm取2/kNm梯梁总活载为:2.51.48/21.75/kNm3.材料235Q钢2215/fNmm2125/vfkNmm4.结构计算(1)梯梁:荷载设计值:踏步部分:1.22.51.41.65.24/kNm取5.5/kNm平台部分:1.22.01.41.754.85/kNm取5.0/kNm应用结构力学求解器计算结构内力,结果如下图:a轴力图b剪力图C弯矩图max8.72MkNmmax9.41VkNmax5.84NkN梯梁选用[25b3289600xWmm腹板面积:22250Ammmax28960021562.38.72MkNmMkNmmax2250125281.39.41VkNVkN满足要求(2)踏步板:(取1m板计算):21.22.51.42.56.5/qkNm2max1/86.50.270.059MkNm4mm钢板抗弯:22max/610004/62150.570.059MbhfkNmMkNm满足要求(3)休息平台:平台板:2max1/86.50.50.200.57MkNmMkNm满足要求加劲板(选用3805,22700xWmm):20.56.53.25/qkNm2max1/83.251.481.89215227004.9MkNmMkNm满足要求