避雷针整体高度为H1H2H329920m8m 取z2
H3管径为4029
z0d210.350.4220.06170.015 取s0.6
kzsz0d20.610.350.420.18KN/m
H2管径为2999
z0d21.250.350.29920.03910.015 取s0.6
kzsz0d20.61.350.350.2990.16KN/m
H12m(避雷针针尖)采用70x5。
风荷载统一取k0.2KN/m
采用MIDAS对该20m避雷针建模,将风荷载以集中活荷载作用于每段杆件中点。 应力:
NM1850040700000N40N/mm2<80N2 80Nmm2(在荷载标准值作用下)。 满足要求。 二、挠度: 独立避雷针挠度:H/100=20000/100=200mm 环形构件受弯强度设计值: 受弯: D0402380603806044.7177.02 t9f215D0299380603806033.2177.02 t9f215 受压: D0402241002410044.7112 t9f215D0402241002410033.2112 t9f215 fbfc215N/mm2 长度系数: K1I1H20.0000863•0.4 I2H10.000215 1N1•I2H1•H2N2••I1100.0002151.12 22.160.0000863 23.12 13.37 22H2i23.129000200.57 1403.379000295.6 102.6 11H1i1轴心受压稳定系数: n2•fyEfyE200.57215•2.050.215 3.14206000n1•122n295.6215•3.040.215 3.14206000 223nn23n2n242n 查《变电构架设计手册》表A-2得:20.965,30.300 21.18 11.1 弯矩作用下钢管截面整体稳定: 2999钢管: 'NEy2EA/1.12=3.1422060008200/(1.1295.62)173276.2 NAmxMxxWx(10.8NNEY')100001.18200117000000100001.1557713010.8 173276.228.1N/mm2f215N/mm22999满足要求 4029钢管: 'NEy2EA/1.12=3.1422060008723/(1.1200.572)400375.7 NAmxMxxWx(10.8NNEY')222001.1811106157000000222001.15106813010.8 400375.750N/mm2f215N/mm24029满足要求 压弯构件局部稳定计算: 2999钢管 N2MC1000020.1431 4AfcIfb82002158628.0910215171062994029钢管 57106402N2MC2220020.2621 4AfcIfb872321521469.3710215满足要求 挠度计算: 采用midas gen 计算,避雷针在风荷载作用下且考虑重力二阶效应,顶点位移△ 法兰螺栓计算: M17KN•m N10KN V3KN NtbmaxMY1Nb Nt2Yin当 M1.7R149.5时,取管中心为旋转轴 NY1237 Y2205 Y3118 Y2I2372220521182168067 MY1N170002371012.75KN 2Yin216806712Ntbmax螺栓采用6.8级M20 Nbtd24ftb24530073500N73.5KNNtbmax12.75KN 满足要求 2.法兰板计算: lx117 ly70 lylx700.6 取0.0747 117Ntbmax12750 q1.6KN/mm2 lxly1177022 Mqlx0.07471.61171636N 板厚t16mm Q235 f215Mpa fr125Mpa 5M6.2mm f 满足要求 3.肋板计算:肋板厚度t6mm b5Nmaxb5127503537.2N/mm2f215N/mm2 正应力:22ht1006Ntbmax1275021.25N/mm2fr125N/mm2 剪应力:ht1006 满足要求 4.焊缝计算: w hf6mm ft160Mpa 竖向: Ntbmax12750f17.25N/mm2fftw1.22160195.2N/mm2helw0.76210026 水平: Ntbmax12750f26.17N/mm2ftw160N/mm2 helw0.7627026应力: b5Nmaxb5127503537.2N/mm2ffw160N/mm2 22ht1006满足要求 因篇幅问题不能全部显示,请点此查看更多更全内容