一、風(fēng)荷載計(jì)算：避雷針整體高度為H+H+H二2+9+9二20m>8m 取0=2123zH管徑為申402x93ywd2=1x0.35x0.422=0.0617>0.015z0取卩=0.6sw d二2x0.6x1x0.35x0.42二0.18KN/mkzsz0H管徑為0299x92ywd2=1.25x0.35x0.2992=0.0391>0.015z0取卩=0.6sw=0卩ywd二2x0.6x1.35x0.35x0.299二0.16KN/mkzsz0H=2m（避雷針針尖）采用070x5。風(fēng)荷載統(tǒng)一取w=0.2KN/mk采用MIDAS對(duì)該20m避雷針建模，將風(fēng)荷載以集中活荷載作用于每段桿件中點(diǎn)。NM+ANM+AYWnX18500 40700000+11106 1.15x1068130=40N/mm2<80N.： <f=215N//mm2 /mm2按《變電所建筑結(jié)構(gòu)設(shè)計(jì)技術(shù)規(guī)定》（NDGJ96-92）10.2.2條規(guī)定，管壁應(yīng)力不宜超過80%m2（在荷載標(biāo)準(zhǔn)值作用下）。滿足要求。二、撓度：獨(dú)立避雷針撓度：H/100=20000/100=200mm環(huán)形構(gòu)件受彎強(qiáng)度設(shè)計(jì)值:受彎：402=44.7<3806038060=177.02299=受彎：402=44.7<3806038060=177.02299=33.2<3806038060=177.02受壓：402二44.7<2410024100215二112二33.2<2410024100215二112廣f=215N/mm2受壓：402二44.7<2410024100215二112二33.2<2410024100215二112廣f=215N/mm2長度系數(shù):H20.0000863K=―^? = =041I H1 0.000215 °2H1 'N?I!10x0.000215 …n= ? 1——= =1.121H2 N?I22.16x0.0000863T2? 1卩=3.12 |i=3.3721=T=200.57卩xH1 1i1=爲(wèi)笄=295.6軸心受壓穩(wěn)定系數(shù)：九=??Z=沖?工=2.05>0.215n2 兀E3.14 206000尢n1九if=295.6i'215忘飛~E=3.14?飛206000=3.04>0.215+九2)+n+aX+九2一4X2n查《變電構(gòu)架設(shè)計(jì)手冊(cè)》表A-2得：a2=°965,a3=0?3009=1.189=1.121彎矩作用下鋼管截面整體穩(wěn)定：G299x9)鋼管：N'=兀2EA/(.1X213.142x206000x8200/(1.1x295.62)=1732762EyN 卩M 10000 1x1700000010000173276.2+ mx x = 10000173276.29AYW(1-0.8上)1.1x82001.15x577130x(1-0.8xx N' (=28.1N/mm2<f=215N/mm2G299x9)滿足要求G402x9)鋼管：N'=n2EA/(.l九213.142x206000x8723/(1.1x200.572)=4003757EyN 卩M 22200 1x5700000022200)400375.7丿+ mx 22200)400375.7丿9AyW(1-0.8-^)1.18x111061.15x1068130x(1-0.8xx N' (=50N/mm2<f=215N/mm2G402x9)滿足要求壓彎構(gòu)件局部穩(wěn)定計(jì)算G299x9）鋼管N2Afc*MCIfbN2Afc*MCIfb100008200x21517x106x29928628.09x104x215=0.143<1G402x9)鋼管MC2+—MC2+—AfIb22200157x106x40228723x215 21469.37x104x215=0.262<1滿足要求撓度計(jì)算:采用midasgen計(jì)算，避雷針在風(fēng)荷載作用下且考慮重力二階效應(yīng)，頂點(diǎn)位移&H/100滿足要求。三、法蘭計(jì)算法蘭螺栓計(jì)算：M=17KN?m N=10KNV=3KNNbtmaxMYZY2i<NbntM=1.7<R=149.5時(shí)，取管中心為旋轉(zhuǎn)軸Y=237Y=205Y=1181 2 3工Y2=2372+2xCo52+II82L168067INbtmaxML+N=17°°°%237+10=12.75KN「n 2x16806712螺栓采用6.8級(jí)M20Nb=哎fb=245x300=73500N=73.5KN>N=12.75KNt4ttmax滿足要求2.法蘭板計(jì)算l=117l二70xyl70斗= l117x0.6取0=0.0747Nb 1max11=1.6KN/mm2117x70xyM=0ql2=0.0747x1.6x1172=1636Nx板厚t=16mmQ235 f=215Mpa f=125Mpar5滿足要求3.肋板計(jì)算：肋板厚度t=6mm正應(yīng)力：=正應(yīng)力：=37.2N/mm2<f=215N/mm25Nbb5x12750x35max—=——h21 1002x6NNb 1maxht100x6-12750-21.25N/mm2<f-125N/100x6r滿足要求4.焊縫計(jì)算h=6mm=160Mpa豎向：NbNbQ— 1maxfhlew12750 、_0.7x6x2x(100-2x6)_17.25N/mm2<pfw二1.22x160二195.2N/mm2ft水平：NNbT— t