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1,2,1(1.(),310020;2.,310020):,,.,,.,,,,.,,50%.:;;;:TV732.4+4:A:1008-536X(2010)02-0035-05BucklingCapacityAnalysisonEmbeddedSteelPenstockwithStiffenerRingZHOUTing1,ZHENGLin-xian2,CHENYa-jun1(1.ZhejiangWaterConservancyandHydropowerBureau,Hangzhou310020,China;2.ZhejiangWaterConservancyandHydropowerConstructionSupervisionCompany,Hangzhou310020,China)Abstract:Thesteelpenstockathydroelectricstation,asakindofthinshellstructure,encountersbuckingfailureeasilyunderex-ternalpressure,whichhasbecomethecontrolfactorinthedesign.Atpresent,MisesFormulaisadoptedtocalculatethecriticalexternalpressurefortheembeddedsteelpenstockinChinaandAmerica,regardingradialrestrictionofliningtothepipeshellassafetyrichness.Inthepaper,inordertoquantitatetheradialrestrictionactionwhichinevitablystrengthensthebucklingcapacityofembeddedsteelpenstock,nonlinearbucklinganalysisisutilizedtosimulatepenstockwithstiffenerringasexposedpenstock.Secondly,embeddedpenstockthroughsetcontactpairbetweenliningandthepipeshellisalsoanalyzed.Thirdly,theresultsbyMisesFormulaaimingatexposedpenstockandthosebysomeotherformuladeducedbyLaiHuajing,whichconcernstheradialre-strictionofconcreteliningtothesteelpenstock,arecontrasted.Atlast,thechangesofcriticalexternalpressurewiththeseambe-tweenpenstockandliningarediscussed.Theresultsindicatethattherestrictionactionofsurroundingconcreteliningtothedefor-mationofsteelpenstockcanstillincreasecriticalexternalpressureby50percentupwardseventakingtheinitialseambetweenlin-ingandthepenstockintoaccount.Keywords:embeddedsteelpenstock;radialrestriction;nonlinearbucklinganalysis;criticalexternalpressure0,,,,:2010-03-31:(1977-),,,..,,[1-4].[2],,,,,,.[3],pcr222Vol.22No.220106J.ZhejiangWat.Cons&Hydr.CollegeJun.2010,,.[4],.[5],,..ANSYS,,,(),,.1.ANSYS:()..,.,,..,,,.,.,(1%)[6-7],..,,,,,..2:r=2100mm,t=21mm,l=2000mm,32mm,2400mm.,1.SHELL143,,,0.02MPa.,,2,,VonMises.,16MnR,325MPa,206GPa,0.3.,.123622,32.14MPa,2.14MPa,.4,,7.6mm.9,.5,(325MPa),337MPa.3453,,5,(),,0.8mC25,6.1mm,,.,0.05MPa,,,,,.673.45MPa.8,2:377,6.7mm,,.9,,343MPa,.,,,.8944.1()[7]:pcr=Est(n2-1)1+n2l22r22r+Es12(1-vs)n2-1+2n2-1-vs1+n2l22r2t3r3(1):pcr,N/mm2;Es,N/mm2;vs;r,mm;t,mm;l,mm;n,n=2.74(r/l)12(r/t)14,.2.23MPa.4.2()[3],,.:P=Etr1-vs22(2-1)1-vs22+2+E12tr32-1+t32+1634+2322-1(2):E=Es(1-vs2);=rl;=n2;n;;P,N/mm2,.P,P3822pcr,dp/d=0.rtl=9.73,(2)4.26MPa.4.31,.[3],,4.26MPa,90%.,(1mm),,2.14MPa3.45MPa,55%,[3]20%.1pcr/MPa1)2.232)2.143)4.264)3.45,.,,,,,.,710-4r,10%,50%.,,,,,.,,,,,50%.5(1),,,.(2),,,,50%,,,.:[1].[M].:,1982.[2],,,.[J].,1998,31(4):14-17.[3],.[J].,1990(12):30-36.[4].[J].,1990(2):41-49.[5],,,.[J].,1998,38(6):700-704.[6].ANSYS[M].:,2002.[7].DL-T5141-2001[S].:,2002.2:39