大型水工预应力渡槽的温度应力分析研究.docx

大型水工预应力渡槽的温度应力分析研究.docx

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大型水工预应力渡槽的温度应力分析研究

外文资料

原文：

ThermalStressAnalysisofAHydraulicPrestressed

[Abstract]LargescaleaqueductisadoptedasaoptionalplanforthecrossingyellowriverstructureoftheprojectoftransferringwaterfromtheSouthtotheNorth.Prestressedreinforcedconcretestructureisthebestchoice.Thedesignedaqueductspanis50m.Self-weightoftheupperpartofthestructureforonespanis15.93MN,andcorrespondingweightofthewaterinonespanis19.85MN.Thestressineverypartofthestructurevarieslargely.Astheprojectislocatedintheareathathaslargetemperaturevariation,thethermalstressproducedinthestructurebythevariationofthesurroundingtemperatureisabigproblem.Inthispaper,thethermalstressintheaqueductisstudiedforallpossibleconditions,andsuggestionstoguaranteethesafetyoftheaqueductunderpossiblelargetemperaturevariationismade.

[Keyword]hydraulicaqueduct；prestressedreinforcedconcrete；thermalstress；

1preface

South-NorthWaterDiversioncentrelinewearHuangaqueductengineeringdesignadoptonepairoftroughstopasswater,thetopstructureoftheaqueductselectstheUaqueductforuse,itis4mtocrosswatersectioninteriorradiusofunderpartsemicircle,thetopofthesemicircletroughisthestraightwallandwingreasonboard,design5.13mofdepthofwater,theclearwidth8moftheaqueductinthetrough.Theminimumthickmiddlepartofwallofsectionis0.35m,thetipis0.5m,is0.85mthatthepositionpartofthebaseplateisthickennedinstepping,thick1.35moftip.Thetroughcarriessection0.5m*0.5mofthecrossbeam,interval5m.Tall7.45moftrough,singletotalwide9moftrough,horizontaltotalwide19mofpairoftroughs,troughminimumandnetfrom1m.ThetopgradeofintensityofstructureconcreteisC50.

Moundcaplevelmeasurementis19.0m*5.0m,thickness2.8m.Moundcaphavehorizontalantidetonationblocklumpandcushionstone,horizontaltoblockpieceassigninbothsides,moundofcap.CombiningtheUaqueducttipstructurepattern,blockoneandadopttheladder-shapedsection,theheightis1.10m;Itisthecylindricaltroughmoundof2.8mthatthebodyofmoundofbothsidesoftheaqueductadopts2piecesofdiameter,adopttheroundmoundofshapeentityofendinthemiddle,theradius1.4mofverybeginningofmound,high5.14m-9.93m,thedistanceis7.35minthemoundofthepost.ItisC40andC30respectivelytooverlaytheroofbeamandgradeofintensityofbodyconcreteofmound;Pourintothefoundationsincludingtopsesandbeartheplatformandeachofunderpart.Itistherectangletobearalevel,thetotallengthis21.2m,thewidthis10.0m,thickness3.5m.Foundationadoptarmoredconcreteisitpourintotohole,eachbearplatformalongtroughtoassigntworowholeandpourintoone,arranging4eachtime,afoot-pathis2.2m.Outsidewithbearingobeytroughofdistanceofsetsofedgeto,to0.8mtroughnothorizontal.Itis6.2mtothecentre-to-centrespacingthatonearrangesthetrough,thehorizontaltroughis5.8mtothecentre-to-centrespacing,itsgrowsbetween68m-80m.ItisC30tobeartheplatformandgradeofintensityofabaseconcrete.

PiercethroughHuangaqueducttroughbodytypicalsectionplacesidewallconcretethickness35cmonly,duringusingnormally,underthesunshineandwarmsituationthatlowersuddenly,thewallisinfluencedbytemperatureinthetrough,theinternalandexternalsurfaceofconcretemustformverygreattemperaturegradient.Therefore,underthesunshineandwarmsituationthatlowersuddenly,itisveryeasytocauseanddrawthestressmoregreatlyontheconcretesurface.ThistextweartoSouth-NorthWaterDiversioncentrelineaqueductHuangstructurereceivestrengthcomplicatedcharacteristicundertemperaturefunction,adoptANSYSprocedurewearaqueductHuanggoonthree-dimensionalfiniteelementisitcalculatetoanalysetoSouth-NorthWaterDiversioncentreline,operateone,overhauloneinordertoverifytheaqueductSecurityproblem.

2waterconservancyprojectaqueducttemperaturestressanalyticalmethods

2.1PiercethroughthenaturalconditionsoftheHuang's

Itisthewaitingareaoftheatmosphereofcontinentalhalf-drieddryseasontodressdistrictHuang,meteorologicalstatisticsstandinstandingaccordingtostandardMengCountyofweatherstationofHenanProvinceandMengjin,thelocalitymakesacleardistinctionbetweenthefourseasons,thedifferenceintemperatureisrelativelyhighinJune-Augusteverymonth,25degreesCentigrade-27degreesCentigradeonaverage,itisrelativelylowinDecember-February,is0.1degreesCentigrade-2.0degreesCentigrade.Whetherminimumtemperatureconsultnearmaterialsoftwocountytown（accordingtowearHuangdistrictMengCountyandMengjincountyof43km）writtendowntohave.¢Ù1961-200040averagetemperatureofthewholeyearofMengjin:

Dayminimumtemperatureextremevalue-11.9onaverageformanyyears（appearJanuary31,1969suchastime）;Theminimumaverageoftemperature-6.42degreesCentigradeonaverageondayformanyyears（1961-2000）;Theminimumtemperatureextremevalue-6.1degreesCentigradeonaverageintendaysformanyyears（appearinmid-Februaryof1964oftime）;Theminimumaverageoftemperature-2.5degreesCentigradeonaverageintendaysformanyyears（1961-2000）.¢Ú1971-200030averagetemperatureofthewholeyearofMengCounty:

Dayminimumtemperatureextremevalue-10.6onaverageformanyyears（appearDecember27,1971suchastime）;Theminimumaverageoftemperature-5.5degreesCentigradeonaverageondayformanyyears（1971-2000）;Theminimumtemperatureextremevalue-4.9degreesCentigradeonaverageintendaysformanyyears（appearinthelasttendaysofDecemberof1971oftime）;Theminimumaverageoftemperature-1.7degreesCentigradeonaverageintendaysformanyyears（1971-2000）.

Averagerainfall604.3mmformanyyears,amongthemtherainfalliscentralizedwithJulyparticularly.Thelargestwindspeed22.0m/s,winddirectionNW.

2.2Theborderconditionoftemperatureandcomputingtechnology

2.2.1Borderconditionoftemperatureon

Theborderconditionissolidsurfaceandinteractivelawofmediumaround,canbedividedintothefollowingtwokinds:

Thefirsttypebordercondition:

SolidsurfacetemperatureTisthetimeknownfunctionoft,namely（onborderB）

Thesecondtypebordercondition:

Whensolidsurfaceandfluid（suchasair,water）keepintouch,passthesolidandsuperficialdensityofthermalcurrent,indirectproportiontodifferenceoffluidtemperatureTcwithsolidsurfacetemperatureT,namely（onborderC）weartemperatureborderprincipleoffetchingetc.

2.2.2ofaqueductHuang

（1）Waterborder

Whentheconcretekeepsintouchwithwater,coefficient¦Âbecomesmoreandmoreinfinitelygreattosendoutheat,canhaveT-Tcbythesecondtypebordercondition=0,namelyT=Tc,turnsintothefirsttypebordercondition.

（2）Airborder

Whentheconcretekeepsintouchwiththeair,itsborderconditionshouldbedealtwithaccordingtothesecondtypebordercondition.Asksolvinginconditionthathowever,accordingtothesecondtypeborder,thecoefficientthatmustchoosetheaccuratesurfaceandsendoutheat,couldreceivemoresatisfactoryresultofcalculation.Becausedeterminethesurfaceofthestructurebordertosendoutheatcoefficientisverycomplicated,so,therealtestthatstilllacksinthisrespectsofarteststhedata.Inviewofabove-mentionedsituations,thecomplexityofcoefficientthatconsiderthesurfaceandsendoutheat,canusesurveyingthetemperaturedataoftheborderastheborderconditiondirectly,namelythefirsttypebordercondition.Thiskindofmethodismoreaccurate.Butonlytherearetemperaturematerialsoftheconcreteslabinbridgesandcivilengineeringatpresent,namelywhatinside,surfaceandairexposedtosurveymaterials,seeforwateryet,fortosurveymaterialsair.

2.2.3Calculatethetheoryandformulaon

Largeandmedium-sizedaqueductcomplicatedtothestructure,thesimulationofitstemperaturefieldandcalculationofthetemperaturestressshouldadoptthelawoffiniteelement,couldreceivethecomparativelyaccurateresult.¦Á,inordertoleadwarmcoefficient,¦È,inordertoriseadiabaticallyandwarmlyamongthem.

PiercethroughtemperaturefieldofaqueductHuangfortemperaturefieldofstabilizing,totheunstableheat-conductionquestion,temperaturefieldTisbesidesmeetingtheheat-conductionequation,mustalsomeetinitialconditiontypeT=¦×（x,y,z）andbordercondition.Distributedaccountingtemperaturestressaccordingtothedifferenceintemperatureaftercalculatingtemperaturefield,accordingtosuffusedwiththetermsofrealizingtheextremevalueoflettering,

2.2.4Calculateloadingandoperatingmode

Theonesthatconsiderwhilecalculatingload:

:

Waterloads,windloading,troughbodyconductingoneselfwithdignity,loading,temperatureloading,liveloadthetroughofprestressingforce.

（1）Waterloads:

Thewaterleveliscalculatedaccordingto5.01minthetrough;

（2）Thewindloads:

Accordingtothewind-forcesituationofZhengzhouandterrainconditionoftherivertrough,confirmwindpressurestrengthas0.86kN/m2;（3）Thetroughbodyconductsoneselfwithdignity:

Theaqueductunitweightofarmoredconcreteis¦Ã=25.0KN/m3,conductsoneselfwithdignityandcalculatesautomaticallybytheprocedure;（4）Prestressingforceloads:

Theprestressingforceconductloadsandisparticipatedincalculating,isthesimplifiedcalculation,regardcablewireandconcreteasseparatebreakingawayfromt