10KV電桿承載力計(jì)算

1、10kV電桿校驗(yàn)計(jì)算說(shuō)明書(shū)一、工程概況本工程為10kV3回架空電力線(xiàn)路工程，采用單桿直線(xiàn)電桿，電桿高度15m,由上下兩節(jié)組成，上面一節(jié)長(zhǎng)9m,下面一節(jié)長(zhǎng)為6m,埋深2m導(dǎo)線(xiàn)采用JKLGYJ-185/10型，檔距為70m,主桿頂徑為D0190mm,底徑為DH390mm,壁厚為50mm桿柱混凝土為C30級(jí)，鋼筋采用12的I級(jí)光圓鋼筋。二、結(jié)構(gòu)計(jì)算依據(jù)(1)輸電桿塔與基礎(chǔ)設(shè)計(jì)(祥和、在國(guó))(2)架空輸電線(xiàn)路設(shè)計(jì)(孟遂民、孔偉)(3) «66kV與以下架空電力線(xiàn)路設(shè)計(jì)規(guī)(GB50061-2010)三、結(jié)構(gòu)荷載取值1 .導(dǎo)線(xiàn)的計(jì)算參數(shù)JKLGYJ-185/10型導(dǎo)線(xiàn)的截面面積：210.93mn

2、f,單位質(zhì)量1016.37kg/km2 .導(dǎo)線(xiàn)無(wú)冰風(fēng)壓綜合比載：1d47.2103MPa/m；3 .導(dǎo)線(xiàn)垂直綜合比載：4d92.47103MPa/m；四、結(jié)構(gòu)靜力計(jì)算分析1、荷載分析(1)運(yùn)行情況：直線(xiàn)桿塔第一種荷載組合情況為最大設(shè)計(jì)風(fēng)速、無(wú)冰、未斷線(xiàn)。a、導(dǎo)線(xiàn)重力：GdidAdL47.210-3210.9370696.9Nb、導(dǎo)線(xiàn)風(fēng)壓：FD4DADL92.47103210.93701365.3N(2)斷線(xiàn)情況：斷一根導(dǎo)線(xiàn)的荷載組合情況為無(wú)冰、無(wú)風(fēng)。導(dǎo)線(xiàn)重力：未斷導(dǎo)線(xiàn)相：s=0.7斷上導(dǎo)線(xiàn)相：Gd'1dAdL348.45N2斷線(xiàn)力：JKLGYJ-185/10型導(dǎo)線(xiàn)計(jì)算拉斷力為T(mén)P450

3、20N,故導(dǎo)線(xiàn)最大使用力為T(mén)maxTP絲0型18008NK2.5導(dǎo)線(xiàn)最大使用力百分比為35%,則TdTmax35%180080.356302.8Ndmax(3)安裝情況I:起吊上導(dǎo)線(xiàn)，荷載組合情況為有相應(yīng)風(fēng)，無(wú)冰。導(dǎo)線(xiàn)重力：Gd696.9N導(dǎo)線(xiàn)風(fēng)壓：PD(10)4D(10)ADL8.892103210.9370131.3N掛上導(dǎo)線(xiàn)時(shí)，導(dǎo)線(xiàn)越過(guò)下橫擔(dān)須向外拉開(kāi)，其拉力,2與水平線(xiàn)的夾角為20。，并假設(shè)上下橫擔(dān)間導(dǎo)線(xiàn)水平拉開(kāi)1.3m。x。，則1.3>>TT2cos201.320.92得Ti1.14T2y=0,則_0.9T1.320.921GdT2sin201.58得工(696.90.3

4、42T2)1223.40.6T20.9聯(lián)立上面兩式可得心2265.6N,T1.14G1.142265.62582.7NTi引起的垂直荷載Gt1和橫向荷載PT1為：一0.9Gt12582.71471.2N1.581.3PT12582.72125N1.58K(GdGti)Gf2001.1(696.91471.2)3002002884.9NPKPtiPD(10)1.12125131.32468.8N(4)安裝情況n：起吊下導(dǎo)線(xiàn)。正在起吊下導(dǎo)線(xiàn)時(shí)下橫擔(dān)處的總重力為:GKGdGf2001.1696.93002001266.6N(5)桿身風(fēng)壓計(jì)算根據(jù)已知條件：風(fēng)壓高度變化系數(shù)取z=1,構(gòu)件體形系數(shù)取s=0

5、.7,桿塔風(fēng)荷載調(diào)整系數(shù)取z=1。1)正常情況大風(fēng)時(shí)上橫擔(dān)處單位長(zhǎng)度桿身風(fēng)壓為：0.2310.231D1(DhD0)D0(390190)190193.1mm15150.190.19330P01zszAfW01.00.7175.4N/m21.6中橫擔(dān)處單位長(zhǎng)度桿身風(fēng)壓為：_1.1_1.1-D2(DhD0)D0一(390190)190204.7mm1515F02zszAfW。1.00.70.1930.2053021.678.4N/m下橫擔(dān)處單位長(zhǎng)度桿身風(fēng)壓為：2.91D3(DhD0)D0152.9115(390190)190228.8mmF03zszAfW01.00.71.00.2050.2293

6、021.685.4N/m電桿接頭處單位長(zhǎng)度桿身風(fēng)壓為：-9D4(DhD0)D01515(390190)190310mmP)4zszAfW。1.00.71_20.2290.3130106.1N/m1.6地面處單位長(zhǎng)度桿身風(fēng)壓為:D51315(DhD0)D01315(390190)190363.3mmF05zszAfW。1.00.70.310.3633021.6132.5N/m2)安裝情況上橫擔(dān)處單位長(zhǎng)度桿身風(fēng)壓為:F01zszAfW01.00.70.190.1931021.68.4N/m中橫擔(dān)處單位長(zhǎng)度桿身風(fēng)壓為：F02zszAfW。1.00.70.1930.2051021.68.7N/m下橫擔(dān)

7、處單位長(zhǎng)度桿身風(fēng)壓為:F03zszAfW。1.00.70.2050.2291021.69.5N/m電桿接頭處單位長(zhǎng)度桿身風(fēng)壓為：F04zszAfW。1.00.70.2290.311021.611.8N/m地面處單位長(zhǎng)度桿身風(fēng)壓為:0.310.363102F>5zszAfW01.00.71-14.7N/m21.62、正常情況下的彎矩計(jì)算(1)運(yùn)行情況(大風(fēng))桿頭荷載如以下圖(a)所示，截面1、2、3、4、5處的彎矩為：M11.1575.40.450.2322.06NmM21.15(1365.30.9278.40.451.132)2878.0Nm696.9(0.5250.8750.475)M

8、31.151365.3(1.8920.9914)10170.7Nm85.40.452.122696.9(0.5250.8750.475)M41.151365.3(8.7727.8746.883)98399.2Nm106.10.4592696.9(0.5250.8750.475)M51.151365.3(12.77211.87410.883)153759.3Nm132.50.45132l大風(fēng)情況電桿彎矩示意圖1398.3N1398.3N1398.3N1398.3N1398.3N6302.8N1699.15N+300N1398.3N1398.3N1398.3N斷線(xiàn)情況(b)(2)斷上導(dǎo)線(xiàn)情況因?yàn)閿?/p>

9、上導(dǎo)線(xiàn)對(duì)桿身產(chǎn)生的彎矩比斷下導(dǎo)線(xiàn)要大得多(即斷上導(dǎo)線(xiàn)起控制作用)，故只計(jì)算斷上導(dǎo)線(xiàn)時(shí)桿柱的彎矩。首先計(jì)算斷導(dǎo)線(xiàn)時(shí)的設(shè)計(jì)荷載，斷導(dǎo)線(xiàn)力為：Td1.46302.88823.9N橫擔(dān)轉(zhuǎn)動(dòng)后斷線(xiàn)力為：Td0.8Td0.88823.97059.14N嵌固點(diǎn)處的彎矩為：M4'1.15KCTDh+(Gd'GF)a11.150.7517059.148.77(348.45+300)0.553769.1Nm據(jù)配筋圖可知電桿通常布置豎向鋼筋1212,電桿采用C30級(jí)混凝土，fcm16.5N/mm2,Ac兀(r22r12)3.14(19521452)53380mm2fy210N/mm2,0.1960.

10、32As1357.2mm,r2195mm,r1145mm,rs170mm,fyA2101357.2-=兀fcmA2fyAs16.55338022101357.2sin=sin(0.196180)=0.58所配鋼筋能承當(dāng)?shù)膹澗貫椋簉r2sin1951450.58M(fcmAc2fyAsrs)(16.55338022101357.2170)45556.78N?m27t23.14故電桿配筋能滿(mǎn)足電桿斷上導(dǎo)線(xiàn)在嵌固點(diǎn)處產(chǎn)生的彎矩要求，但不能滿(mǎn)足大風(fēng)情況電桿的彎矩要求。(3)電桿在安裝導(dǎo)線(xiàn)時(shí)的強(qiáng)度驗(yàn)算根據(jù)導(dǎo)線(xiàn)安裝情況時(shí)引起的荷載對(duì)桿柱進(jìn)行強(qiáng)度驗(yàn)算，即檢查桿柱在安裝荷載作用下各處彎矩是否滿(mǎn)足配筋的抵抗彎矩

11、，安裝導(dǎo)線(xiàn)時(shí)桿頭設(shè)計(jì)荷載如圖(c)、(d)所示。I、安裝上導(dǎo)線(xiàn)時(shí)各處的彎矩為：M1(2884.90.5696.90.58.40.50,232)0.91749.3N?m2M2(5285.30,51398.30,56387.20,91696.80.9P020.51,132)0.98301.48N?m2M35285.30.51398.30.56387.21.891696.8(1.8920,994)R)30.52.120.926830.84N?mn、安裝下導(dǎo)線(xiàn)時(shí)各處的彎矩為：M1F0110.50,2320.90.17N?m2M2(1696.80.9F020.51,132)0,91531.88N?mM3

12、(2038.13398.30.525139810.8750,475)1696.&1.8920,994)M0.52.120.910442.06m安裝時(shí)產(chǎn)生的最大彎矩M11749.3N?m,M28301.48N?m,M326830.84N?m3(4)電桿正常情況運(yùn)行的裂縫寬度驗(yàn)算結(jié)合實(shí)際情況知，電桿配筋圖的嵌固點(diǎn)處配置1212光面I級(jí)鋼筋，采用41級(jí)螺旋鋼筋，螺距為S=50mm電桿根部r2195mm,口145mm,rs170mm,Ac兀(r22r12)3,14(19521452)53380mm2,A.1357.2mm2,_2_2.，_一一一.2Ec29.5kN/mm,Es210kN/mm,光面鋼筋1,ftk2.0N/mma、驗(yàn)算裂縫寬度應(yīng)采用彎矩標(biāo)準(zhǔn)值(即荷載標(biāo)準(zhǔn)值引起的彎矩)m5_2_EsEc21029.57.121.151696.8(12.77211.87410,883)1398.3(0.8750.4750,525)78.870.5132212樂(lè)N?m_2AAc(e1)A53380(7.121)1357.261686.064mm22A02261686.0643Wd(r12r2