钢结构单层工业厂房21m跨度的设计计算书

拉应力： ??N57.5?103NA?14.58?102mm2?39.4N/mm2?215N/mm2 所选截面满足。 5 竖杆

各个竖杆采用同类截面，按Gg杆件的最大设计内力设计。

NGgmin??56.2kN

lox?0.8?289.0cm?231.2cm，loy?289.0cm

内力较小，按????150选择，需要的回转半径为：

ilox231.2cmloy289.0cmx?[?]?150?1.54cm，iy?[?]?150?1.93cm选用2L63×6，

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A?14.58cm2，lx?1.93cm，ly?2.99cm

?x?lox231.2??119.79?[?]?150 ix1.93?loyy?i?2892.99?96.66?[?]?150 y?b/t?63/6?10.5?0.58loy/b?0.58?2890mm/63mm?26.61??yz??y(1?0.475?b4/l20yt2)?99.66?(1?0.475?634/28902?62)?102.14?[?]?150 由于?x??yz，查附录1.2，得??0.437，

N56.19?103???A?N0.437?14.58?102mm2?88.19N/mm2?215N/mm2 所选截面满足要求。

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杆件内力截面形式截面面计算长度回转半径长细比名称编号（KN）和规格积loxloyixiyλxλyλyz[λ]φminN/φAσ焊缝=N/A肢背肢尖上弦A-H-651.62L125×80×1039.42150.8301.62.246.1167.349.456.91500.807212.9下弦a-h6402L100×63×1030.9430010351.745.2172.4206.2350207aB-411.12L100×80×827.882532533.143.4880.672.780.61500.688214.38-1806-200Bc310.72L63×614.58209261.31.932.9910887.43502137-1706-170cD-235.92L75×720.32229.1286.42.33.4899.682.385.41500.555209.28-1206-160De149.42L50×59.61229.1286.41.352.24169.7127.83501566-1206-120腹杆eF-84.12L63×614.58249.9312.41.932.99129.5104.5106.71500.39147.96-1206-120Fg33.52L63×614.58249.9312.41.932.99129.5104.51500.395.96-1206-120gH57.52L63×614.58271.23391.932.99140.5113.41500.34111.66-1206-120Aa102.62L63×614.58159.21191.932.9982.5103.11500.67510.46-1206-120Cc-56.192L63×614.58183.22291.932.9995771500.5946.496-505-50Ee-56.192L63×614.58207.22591.932.99107871500.5117.56-1206-120Gg-56.192L63×614.58231.22891.932.99120971500.4378.826-1206-12023

6、节点设计

1、下弦节点“c”（图6.1） Bc杆（2L 63×6）NBc??310.7kN. 肢背：hf?7mm?hfmax?1.2tmin?1.2?6?7.2mm且?hfmin?1.5tmax?1.510?4.74mm

l0.75N0.75?310.7?103Nw1?2hw??148mm，取170mm

eff2?0.7?7mm?160N/mm2肢尖：hf?6mm?hfmax?t?6mm且?hfmin?1.5tmax?1.510?4.74mm

l?0.65Nw22hw?0.65?310.7?103N/mm2?150mm，取170mm eff2?0.7?6mm?160NcD杆（2L75×7）NcD?235.9kN.

肢背：hf?8mm?hfmax?1.2tmin?1.2?7?8.4mm且?hfmin?1.5tmax?1.510?4.74mm

0.75N0.75?235.9?103lNw1?2hw?8mm?160N/mm2?98.7mm，取120mm

eff2?0.7?肢尖：hf?6mm?hfmax?t?(1~2)?5~6mm且?hfmin?1.5tmax?1.510?4.74mm

l?0.65N2hw?0.65?235.9?103Nw22?0.7?6mm?160N/mm2?144mm，取160mm eff

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