18m跨三角形鋼桁架課程設(shè)計(jì)

1、一、設(shè)計(jì)題目18m跨三角形鋼桁架二、設(shè)計(jì)資料壁C度8度222B2檁條兼用上弦下弦屋架支撐布置1-1剖面圖上弦集中荷載上弦節(jié)點(diǎn)荷載上弦集中荷載及節(jié)點(diǎn)荷載表備注P 丿P 丿P 丿3、上弦節(jié)點(diǎn)風(fēng)荷載設(shè)計(jì)值如圖所示。（1）按照規(guī)范可知風(fēng)荷載體形系數(shù)：背風(fēng)面；迎風(fēng)面（2）上弦節(jié)點(diǎn)風(fēng)荷載為：上弦節(jié)點(diǎn)風(fēng)荷載M 丿1=M 21 W xyl155.52.1572.3 =x0 xixl = 0y3.1150yiyl 0y .57bt70611.7=b0.475b40.47574) 50) 56.6 =ylt155.5 0.622220y 0.736 y 由 xyx N / 223222N 丿577.051.11.

2、1 72.322x1.05 2 1.21 0.851.49kNmM136NM175.610 N0.851.4910 Nmmmx10.736 1632mm2175.6kN ANx1.0538.7410 mm 10.8W 10.833577.05kN 1 1xN丿Ex199.4N /mm f 215N /mm22 T N丿Mmxx1NAW11.252x）x2N丿Ex175.6 N0.851.49 36=21.2614.96 1）3322yb 10.0017fy/235 10.0017500.915y0.85Mx11.49kNmN1175.6 N0.85 36x 116.32 38.74 32232

3、22 nN175.6 N 36 169.8N / f N /22 1.214.96 22337N .62。iyxl1.73 =x0 xixl=0y885351.2yi2.52yN 166.62 N3189.8N / f 28.78 22桿 yl = 0y0.9*1100.7141.4yiyl 0y 99bt3649=b0.85b40.853.6499 0.4) 141.4)154.3 =ylt22220y 0.294由 xyN13.54 N3A N / f N / 174.6N /222*10 22屋架桿件截面選用表ybx上弦桿1789下弦桿05）443215 R備注桿74444腹桿44444

4、4設(shè)22R65.69 N3q 1.26N /2 22 qa 0.061.26169 2159.2Nmm則M2216Mt11.7,取t 12mmfR65.6910 N30.7hf lw 0.7 8mm 844mm13.9N /mm f 160N /mm2w2ff N=418.75kMP1=2.53kMN=397.32kN684R=65.6kNN則支座節(jié)點(diǎn)圖226NeN 20.7hflw2 0.7hflwf 2223 1.2220.74mm510 mm 20.74mm510mm2268.3N /mm f 160N /mm2w2f PP上弦中間節(jié)點(diǎn)圖NN1N2M Nee ft2N2wf 1.4fhf

5、lw 2 0.7hflw2上 弦 1 244P上弦屋脊節(jié)點(diǎn)1）上弦桿拼接角鋼的連接焊縫以該節(jié)點(diǎn)的最大軸力 N 計(jì)算。設(shè)hf=4mm，則有N3880.410 N3l w1010mm 222,取230mm40.7h f40.74mm160N /mm2wff 15%按下式計(jì)算。設(shè) m 按構(gòu)造要求為 丿則22 20.7hflw20.7hflwf 2 0.15*6 159.65 10 N 50mm2233 1.44210 mm 1.41.224mm210mm2231.4N /mm f 160N /mm2w2f（5）節(jié)點(diǎn) 5（見下圖）NN=Af1）下弦桿拼接角鋼的連接焊縫按全截面的等強(qiáng)度條件計(jì)算。設(shè)Anf8.7810 mm 215N /mml w1022210mm 115mm,h4mm40.7h f40.74mm160N /mm2fwff取 2l wN的h4mm。f0.5N N