電桿抗傾覆計算

,,,表一環(huán)形預(yù)應(yīng)力電桿抗傾覆計算,

電桿埋深ht（m),2.5,,,

等代內(nèi)摩阻角β（度）,30,,,

電桿尾徑b（m),0.39,,,

土的側(cè)壓力系數(shù)ξ(查表）,0.6,,,

RADLANS(45+β/2),1.047197551,,,

RADLANSβ,0.523598776,,,

cos(45+β/2),0.5,,,

tanβ,0.577350269,,,

k0=1+2htξcos(45+β/2)tanβ/3b,1.740192653,,,

b0=k0b,0.678675135,,,

地上部分高度H0(m),12.5,,,

η=H0/ht,5,,,

θ(查表）,0.72,,,

μ=3/（1-2θ^3),11.83413279,,,

土壓力參數(shù)m(kN/m3),48,,,

極限抵抗彎矩Mj=mb0ht^3/μ(kN.m),43.01171533,,,

,,,表二環(huán)形預(yù)應(yīng)力電桿抗傾覆計算,風(fēng)壓對電桿及導(dǎo)線產(chǎn)生的彎矩

風(fēng)速V（m/s),35,,,

風(fēng)壓不均勻系數(shù)a,0.75,,,

導(dǎo)線或地線的體型系數(shù)μsc,1.1,,,

導(dǎo)線外徑d(m),0.0275,,,

風(fēng)向與導(dǎo)線的夾角θ（度）,90,,,

RADLANSθ,1.570796327,,,

sinθ,1,,,

sin2θ,1,,,

風(fēng)壓高度變化系數(shù)μz,1,,,

W0=V^2/1600(KN/m2),0.765625,,,

WX=aLdμscμzW0sin2θ(kN),0.017370117,,,

導(dǎo)線對地面產(chǎn)生的彎矩M1=1.15*{2*(H0-0.6)Wx+WxH0}(kN.m),0.725115542,,,

風(fēng)載體型系數(shù)μs,0.7,,,

桿身風(fēng)載調(diào)整系數(shù)βz,1,,,

電桿稍徑B,0.19,,,

電桿在地面處直徑D=B+H0/75,0.356666667,,,

桿塔承受風(fēng)壓投影面積計算值A(chǔ)f=(D+B)H0/2（m2),3.416666667,,,

WS=βzAfμsμzW0(kN),1.831119792,,,

電桿合力作用點離地面高度Z=H0(2B+D)/3(B+D),5.614837398,,,

電桿風(fēng)壓對地面處產(chǎn)生的彎矩M2=WsZ(kN.m),10.28143989,,,

基礎(chǔ)附加分項系數(shù)rf,1.1,,,

極限檔距L=(Mj/1.1-M2)/M1（m),39.74555479,,,

當(dāng)Sj<rf.S0或Mj<rf.S0.H0時，應(yīng)采取措施增強抗傾覆承載能力。一般方法是在基礎(chǔ)埋深1/3處加設(shè)上卡盤。,,,,

基礎(chǔ)附加分項系數(shù)rf,1.1,,,

設(shè)計地面至上卡盤的距離y1=ht/3(m),0.833333333,,,

電桿風(fēng)壓換算到作用點的力T1(kN),0.822515191,,,

單根導(dǎo)線受到的風(fēng)壓N1(kN),0.690384944,,,

單根導(dǎo)線風(fēng)壓換算到作用點的力N2(kN),0.657246467,,,

導(dǎo)線風(fēng)壓換算到作用點的力T2=N1+2N2(k