您好,欢迎访问三七文档
当前位置:首页 > 行业资料 > 交通运输 > 10KV电杆承载力计算
10kV电杆校验计算说明书一、工程概况本工程为10kV3回架空电力线路工程,采用单杆直线电杆,电杆高度15m,由上下两节组成,上面一节长9m,下面一节长为6m,埋深2m,导线采用JKLGYJ-185/10型,档距为70m,主杆顶径为0190Dmm,底径为390HDmm,壁厚为50mm。杆柱混凝土为C30级,钢筋采用12的Ⅰ级光圆钢筋。二、结构计算依据(1)《输电杆塔及基础设计》(陈祥和、刘在国)(2)《架空输电线路设计》(孟遂民、孔伟)(3)《66kV及以下架空电力线路设计规范》(GB50061-2010)三、结构荷载取值1.导线的计算参数JKLGYJ-185/10型导线的截面面积:210.93mm2,单位质量1016.37kg/km2.导线无冰风压综合比载:3147.210a/mdMP;3.导线垂直综合比载:3492.4710a/mdMP;四、结构静力计算分析1、荷载分析(1)运行情况:直线杆塔第一种荷载组合情况为最大设计风速、无冰、未断线。a、导线重力:-3147.210210.9370696.9DDDGALNb、导线风压:3492.4710210.93701365.3DDDPALN(2)断线情况:断一根导线的荷载组合情况为无冰、无风。导线重力:未断导线相:s=0.7断上导线相:'1348.452DDDALGN断线张力:JKLGYJ-185/10型导线计算拉断力为45020PTN,故导线最大使用张力为max45020180082.5PTTNK导线最大使用张力百分比为35%,则max35%180080.356302.8DTTN(3)安装情况Ⅰ:起吊上导线,荷载组合情况为有相应风,无冰。导线重力:696.9DGN导线风压:3104108.89210210.9370131.3DDDPALN()()挂上导线时,导线越过下横担须向外拉开,其拉力2T与水平线的夹角为20°,并假设上下横担间导线水平拉开1.3m。0x,则°12221.3cos201.30.9TT,得121.14TTy=0,则°12220.9sin201.30.9DTGT得1221.58(696.90.342)1223.40.60.9TTT联立上面两式可得22265.6TN,121.141.142265.62582.7TTN1T引起的垂直荷载1TG和横向荷载1TP为:10.92582.71471.21.58TGN11.32582.721251.58TPN1()2001.1(696.91471.2)3002002884.9DTFGKGGGN1101.12125131.32468.8TDPKPPN()(4)安装情况Ⅱ:起吊下导线。正在起吊下导线时下横担处的总重力为:2001.1696.93002001266.6DFGKGGN(5)杆身风压计算根据已知条件:风压高度变化系数取z=1,构件体形系数取s=0.7,杆塔风荷载调整系数取z=1。1)正常情况大风时上横担处单位长度杆身风压为:1000.2310.231()(390190)190193.11515HDDDDmm20100.190.193301.00.7175.4/21.6zszfPAWNm中横担处单位长度杆身风压为:2001.11.1()(390190)190204.71515HDDDDmm20200.1930.205301.00.7178.4/21.6zszfPAWNm下横担处单位长度杆身风压为:3002.912.91()(390190)190228.81515HDDDDmm20300.2050.229301.00.71.085.4/21.6zszfPAWNm电杆接头处单位长度杆身风压为:40099()(390190)1903101515HDDDDmm20400.2290.31301.00.71106.1/21.6zszfPAWNm地面处单位长度杆身风压为:5001313()(390190)190363.31515HDDDDmm20500.310.363301.00.71132.5/21.6zszfPAWNm2)安装情况上横担处单位长度杆身风压为:2'0100.190.193101.00.718.4/21.6zszfPAWNm中横担处单位长度杆身风压为:2'0200.1930.205101.00.718.7/21.6zszfPAWNm下横担处单位长度杆身风压为:2'0300.2050.229101.00.719.5/21.6zszfPAWNm电杆接头处单位长度杆身风压为:2'0400.2290.31101.00.7111.8/21.6zszfPAWNm地面处单位长度杆身风压为:2'0500.310.363101.00.7114.7/21.6zszfPAWNm2、正常情况下的弯矩计算(1)运行情况(大风)杆头荷载如下图(a)所示,截面1、2、3、4、5处的弯矩为:211.1575.40.450.232.06MNm221.15(1365.30.9278.40.451.13)2878.0MNm32696.9(0.5250.8750.475)1.151365.3(1.8920.9914)10170.785.40.452.12MNm42696.9(0.5250.8750.475)1.151365.3(8.7727.8746.883)98399.2106.10.459MNm52696.9(0.5250.8750.475)1.151365.3(12.77211.87410.883)153759.3132.50.4513MNm50050045012004501200475525875231,5900991012346877.54000200051.37N.m13079.5N.m138669.6N.m213639.7N.mM(N.m)3546.6N.m大风情况电杆弯矩示意图1696.8N1398.3N运行情况(a)699.15N+300N断线情况(b)6302.8N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1398.3N1398.3N1398.3N1398.3N1398.3N1398.3N1398.3N1398.3N安装情况Ⅰ(c)6387.2N5285.3N安装情况Ⅱ(d)1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N1696.8N1398.3N2038.13N1696.8N(2)断上导线情况因为断上导线对杆身产生的弯矩比断下导线要大得多(即断上导线起控制作用),故只计算断上导线时杆柱的弯矩。首先计算断导线时的设计荷载,断导线张力为:1.46302.88823.9DTN横担转动后断线张力为:0.80.88823.97059.14DDTTN嵌固点处的弯矩为:41'1.15+'a1.150.7517059.148.77(348.45+300)0.553769.1CDDFMKThGGNm()据配筋图可知电杆通常布置竖向钢筋1212,电杆采用C30级混凝土,216.5/cmfNmm,cAπ2222221()3.14(195145)53380rrmm,21357.2sAmm,2195rmm,1145rmm,170srmm,2210/yfNmm,2101357.2=0.1960.3216.55338022101357.2yscmysfAfAfAπ°sin=sin0.196180=0.58()所配钢筋能承担的弯矩为:12csin1951450.582)(16.55338022101357.2170)45556.78223.14cmyssrrMfAfArNm(π故电杆配筋能满足电杆断上导线在嵌固点处产生的弯矩要求,但不能满足大风情况电杆的弯矩要求。(3)电杆在安装导线时的强度验算根据导线安装情况时引起的荷载对杆柱进行强度验算,即检查杆柱在安装荷载作用下各处弯矩是否满足配筋的抵抗弯矩,安装导线时杆头设计荷载如图(c)、(d)所示。Ⅰ、安装上导线时各处的弯矩为:21(2884.90.5696.90.58.40.50.23)0.91749.3MNm'2202(5285.30.51398.30.56387.20.91696.80.90.51.13)0.98301.48MPNm'23035285.30.51398.30.56387.21.891696.8(1.8920.994)0.52.120.926830.84MPNmⅡ、安装下导线时各处的弯矩为:'21010.50.230.90.17MPNm'2202(1696.80.90.51.13)0.91531.88MPNm'2303(2038.131398.3)0.5251398.3(0.8750.475)1696.8(1.8920.994)0.52.120.910442.06MPNm安装时产生的最大弯矩11749.3MNm,28301.48MNm,326830.84MNm(4)电杆正常情况运行的裂缝宽度验算结合实际情况知,电杆配筋图的嵌固点处配置1212光面Ⅰ级钢筋,采用4Ⅰ级螺旋钢筋,螺距为S=50mm。电杆根部2195rmm,1145rmm,170srmm,cAπ2222221()3.14(195145)53380rrmm,21357.2sAmm,229.5/cEkNmm,2210/sEkNmm,光面钢筋21,2.0/tkfNmma、验算裂缝宽度应采用弯矩标准值(即荷载标准值引起的弯矩)251.151696.8(12.77211.87410.883)1398.3(0.8750.4750.525)78.870.513212.5MkNm2107.1229.5sEcEE20(1)53380(7.121)1357.261686.064cEsAAAmm2222301261686.064()(195145)5356708.9444170dsAWrrmmr1220.41.46rr,22.0/tkfNmmb、计算开裂弯矩1.462.05356708.9415.64crtkdMfWkNmc、计算裂缝宽度65max3(212.515.64)10(200
本文标题:10KV电杆承载力计算
链接地址:https://www.777doc.com/doc-4189673 .html