梯形钢屋架设计.doc

目录 1 设计资料············································································································ 1 2 屋架形式及几何尺寸····························································································· 1 3 支撑的布置········································································································· 2 4 荷载计算············································································································ 3 5 内力计算············································································································ 4 6 杆件复核············································································································ 5 7 节点复核··········································································································· 10 采用 PKPM 软件进行设计,对杆件和部分节点进行手算复核。 1 设计资料 结构形式跨度为 21m,总长 90m,柱距 6m,采用梯形钢屋架。 屋架尺寸及选材屋架端部高度设计为 m,屋面坡度为 1/10 ,采用 Q235 钢, E43 型焊条。 荷载标准值恒载有: 防水层、找平层、保温层等 kN/m 2 预应力混凝土屋面板(含灌缝) kN/m 2 屋架及支撑自重?? 2 kN/ m k g L ? ? kN/m 2 活载有: 屋面均布活载 kN/m 2 雪荷载 kN/m 2 积灰荷载 kN/m 2 屋面为重屋面,不考虑风荷载;抗震设防烈度为 6度,不考虑地震作用。 2 屋架形式及几何尺寸(1) 计算跨度 0 2 150 21000 2 150 20700mm L L ? ??????; (2) 屋架中部高度 21000 1800 =2850mm 2 H ? ??; (3) 屋架跨中起拱高度 L /500= 42 mm ,实取 50 mm ; (4) 几何尺寸如下图 1所示: 1508 1357 1508 1508 1508 1508 1508 2850 3000 3000 3000 1815 2100 2400 2700 2850 2376 2709 2964 3226 2455 2699 2953 42 A BCD E F G H I J K L M 屋架几何尺寸示意图(单位: mm ) 图1 屋架几何尺寸示意图(单位: mm ) 3 支撑的布置根据车间长度、屋架跨度和荷载情况,上、下弦各设两道横向水平支撑,具体见支撑布置图 2。 3 SC1 SC2 SC2 SC1 SC1 SC2 SC2 SC1 LG2 GG1 GG2 LG2 GG1 LG1 LG1 LG1 LG1 LG2 GG1 GG2 LG2 GG1 LG2 GG1 GG2 LG2 GG1 LG2 GG1 GG2 LG2 GG1 LG2 LG2 5400 6000×4 6000 6000×3 1 a 3 XC1 XC2 XC2 XC1 XC1 XC2 XC2 XC1 LG1 LG2 LG1 LG1 LG1 LG1 LG1 LG1 LG2 LG1 LG1 LG2 LG1 LG1 LG2 LG1 1 1 5400 6000×3 6000 6000×4 4 b 1 LG2 GG2 c 1-1 剖面垂直支撑图2 屋面支撑布置(单位: mm ) SC -上弦支撑; XC -下弦支撑; CC -垂直支撑; GG -刚性系杆; LG -柔性系杆 4 荷载计算屋面活荷载与雪荷载不同时组合,屋面活荷载大于雪荷载,故只取屋面活荷载进行计算。由