考虑管道反摩擦的预应力钢筋预应力回缩损失的简化计算

:0451-0712(2002)05-0006-02:U444.802:B(100010):,:;;[1]5.2.7:,,,VSL[2],,,1(,),Rcon,Ra,m(1):1m=(Rcon-Ra)öl(1)1,abc,$Rl2,1aa,,blf,l$l([1]5.2.7),x,$Rl2,x,Ex=$Rl2,xöEp,lf$l,:$l=lf0Exdx=lf0$Rl2,xEpdx(2)Ep$l=lf0$Rl2,xdx(3)lf0$Rl2,xdxaba,Ep$laba,$aba=ml2f=$lEp,:lf=$lEpm(mm)(4):$Rl2=2mlf(MPa)(5)x:$Rl2,x=$Rl2lf-xlf(MPa)(6):Ep(MPa);$l(mm);m(MPaömm);lf(mm);x(mm):2002-02-07200255HIGHWAYMay12002No152l(),(,),lfl,,,1acca,õacca=$lEp,1,::$Rl2=$lEpl+ml(MPa)(7):$Rl2,a=$lEpl-ml(MPa)(8)x:$Rl2,x=$Rl2-2mx(MPa)(9)3(),,,,RconRl1Rl2,4l=20m,250m0.2m,0.08rad,Rcon=1395MPa,$l=6mm,L=0.35,k=0.003,Ep=2105MPa,lö3=6.667m:,Ra=Rcon1e(LH+kx)=13951e(0.350.08+0.00320)=1277MPa(1),m=(Rcon-Ra)öl=(1395-1277)ö20000=0.0059MPaömm(4),lf=$lEpöm=62105ö0.0059=14261mm=14.261m20m,lö3=6.667m,H=1ö3(0.08)=0.0267rad,Rx1=Rcon1e(LH+kx)=13951e(0.350.0267+0.0036.667)=1355MPa,(5)$Rl2=2mlf=20.005914261=168MPa,x1=6.667m(6)Rl2,x=$Rl2(lf-x1)ölf=168(141261-61667)ö141261=89MPax1=6.667m,Rx1=1355-89=1266MPa,Ra=1277MPa,m=0.0059MPaömm,lf=14.261m2lö3=13.333m,H=2ö3(0.08)=0.0533rad,Rx2=Rcon1e(LH+kx)=13951e(0.350.0533+0.00313.333)=1316MPa,(5)$Rl2=2mlf=20.005914261=168MPa,x2=13.333m(6)Rl2,x2=$Rl2(lf-x2)ölf=168(14.261-13.333)ö141261=11MPax2=13.333m,Rx2=1316-11=1305MPa,6.667m,,,,1305MPa:[1](JTJ023-85).[2]..,1988.720025::0451-0712(2002)05-0008-03:U441:B,(400074):,:;;,,,,,,,11,,,,,,,,11.1:2002-01-21ASimplifiedMethodofCalculationforLossofPrestressofaTendonduetoDraw-inofAnchorageCountingCounter-FrictionofaSheathYUANLun-yi(ChinaHighwayPlanningandDesigningInstitute(HPDI),INC.,Beijing100010,China)Abstract:Thisarticleexplainsasimplifiedmethodofcalculationforlossofprestressofatendonduetodraw2inofanchoragecountingcounter2frictionofasheathinvarioustensioningsituation.Keywords:counter2frictionofasheath;lossofprestressduetodraw2inofanchorage;simplifiedcalculation200255HIGHWAYMay12002No15