(整理)避雷针计算书

精品文档精品文档一、风荷载计算：避雷针整体高度为m820992321mHHH取2z94023管径为H015.00617.042.035.01d220z取6.0smKNdzszk/18.042.035.016.02092992管径为H015.00391.0299.035.025.1d220z取6.0smKNdzszk/16.0299.035.035.16.020mH21（避雷针针尖）采用570x。风荷载统一取mKNk/2.0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：2/40106813015.1407000001110618500mmNWMANXn280mmNf=2152mmN按《变电所建筑结构设计技术规定》（NDGJ96-92）10.2.2条规定，管壁应力不宜超过280mmN（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：02.17721538060380607.4494020ftD02.17721538060380602.3392990ftD精品文档精品文档受压：11221524100241007.4494020ftD11221524100241002.3394020ftD2/215mmNffcb长度系数:000215.00000863.012211HHIIK0.412.10000863.016.22000215.0102112211ININHH12.3237.3157.200140900012.32222iH6.2956.102900037.31111iH轴心受压稳定系数：215.005.220600021514.357.2002Efyn215.004.320600021514.36.2951Efyn222322322421nnnnnn查《变电构架设计手册》表A-2得：300.0,965.03218.121.11弯矩作用下钢管截面整体稳定：9299钢管：22'1.1/EANEy=)6.2951.1/(820020600014.322173276.2精品文档精品文档9299/215/1.282.173276100008.0157713015.117000000182001.110000)8.01(22'mmNfmmNNNWMANEYxxxmx满足要求9402钢管：22'1.1/EANEy=)57.2001.1/(872320600014.322400375.79402/215/507.400375222008.01106813015.15700000011110618.122200)8.01(22'mmNfmmNNNWMANEYxxxmx满足要求压弯构件局部稳定计算：9299钢管1143.02151009.862822991017215820010000462bcIfMCAfN9402钢管1262.02151037.2146924021057215872322200462bcIfMCAfN满足要求挠度计算:采用midasgen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△H/100满足要求。三、法兰计算法兰螺栓计算：mKNM17KNN10KNV3btibtNnNYMYN21max当5.1497.1RNM时，取管中心为旋转轴精品文档精品文档2371Y2052Y1183Y16806711820522372222IYKNnNYMYNibt75.12121016806722371700021max螺栓采用6.8级M20KNNKNNfdNbtbtbt75.125.73735003002454max2满足要求2.法兰板计算：117xl70yl6.011770xyll取0747.02max/6.17011712750mmKNllNqyxbtNqlMx16361176.10747.022板厚mmt16Q235Mpaf215Mpafr125mmfM2.65满足要求3.肋板计算：肋板厚度mmt6精品文档精品文档正应力：2222max/215/2.376100351275055mmNfmmNthbNb剪应力：22max/125/25.21610012750mmNfmmNhtNrbt满足要求4.焊缝计算：mmhf6Mpafwt160竖向：22max/2.19516022.1/25.1762100267.012750mmNfmmNlhNwtfwebtf水平：22max/160/17.266270267.012750mmNfmmNlhNwtwebtf应力：2222max/160/2.376100351275055mmNfmmNthbNwfb满足要求