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1、计算模型如图所示：F仁 F2=6.32kN q=11.4kg/m X 9.8N/kg=111.72N/m弯矩图剪力图抗弯计算Mxrx 二 1.05Wnx 二 34.72 cm34831.22 1031.05 34.72 103=132.52N / mm2205N / mm2所以抗弯满足要求抗剪计算VS.=ItwS = 21.125cm3I = 138.9cm46621.64 21.125 103138.9 104 5=20.14N / mm2匚=120N / mm2所以抗剪满足要求挠度计算集中力作用下F x a 22Wmax(3I2 一 4a2)24EIE=2.1 106N / mm2Wnx6
2、320 江 70024 2.1 106 138.9 104(3 54002 - 4 7002)-5.33mm在均布荷载作用下挠度过小可忽略不计。Wmax=5.33mm 一4006000400=15mm所以挠度满足要求。附表产品部分養數CGB/T3Q94-2000)边长/im壁厚皿截面面积/cb2理论重量/血/M惯性矩/oU截面模;Vcm3403.5t 93.8511.165.58生5.494. sd14.376.S4；5L9S5.4S16.56L8767.555.9315.347. 6?504：7.095.5625.9610. 225&5E氐p29,3111.9369.9533.351
3、3.34711. 21ais36.23U. 49S12,353S, 5115. 41£0510l5S&354.57IS. 19613l359.6961.8220.617ltd1160.0322.60呂15.55；2.2173. 3S曲4370512.589.8790.26_25. 7961£711.58103.129. 47716,8113. d114.532. 72813,75u. p124.535.5780515811.44138.9虱72617.1513.46159.739. 9S71916115.3178.5M心821,9517.23195,44=8. 859251S.9S13.33217.14：7.19620,0315.72251.154.99722.97IS. 032S2.361.38B25.7920.2531 Cl 967,585IB. 5814.5S2S2.056.5762L95IL 23323.265.54100725.2119.79370l274. 04B28.3522. 3640S.9SI. 70