桥梁裂缝产生原因浅析英文知识讲解Word文件下载.docx

桥梁裂缝产生原因浅析英文知识讲解Word文件下载.docx

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Inrecentyears,ourprovincetransportationinfrastructureobtainedtheswiftandviolentdevelopment,eachplacehasconstructedthemassiveconcretebridge.Inthebridgeconstructionandtheuseprocess,concernsbecauseofappearsthecrackbuttoaffecttheprojectqualityeventoleadthereportcommonoccurencewhichthebridgebreaksdowncollapses.Theconcretedehiscencemaysayis"

oftenistakenbad"

and"

frequently-occurringdisease"

ispuzzlingthebridgebuildingtechnicalpersonnelfrequently.Actually,ifadoptsthecertaindesignandtheconstructionmeasure,verymanycracksaremayovercomeandcontrol.Inordertofurtherstrengthenstotheconcretebridgecrackunderstanding,avoidsintheprojectappearingtheharmbigcrackasfaraspossible,thisarticlethereasonwhichandproducestotheconcretebridgecracktypemakesthecomprehensiveanalysis,thesummaryasfaraspossible,byfacilitatesthedesign,theconstructiondiscoversthecontrolcrackthefeasiblemeans,achievestheguardinnothoweverfunction.

Lconcretebridgecracktype,origin

Infact,theconcretestructuralcracksoriginiscomplexandtherearemanykindsoffactors,eventheyaffectitmutually,buteachcrackhasittohaveonekindoforseveralkindofmainreasons.Theconcretebridgecracktype,asthereasonitproduced,maydividethefollowingseveralkindsapproximately:

First,theloadcausescrack

Theconcretebridgeisstaticintheconvention,movesthecrackwhichundertheloadandthesecondarystressproducestocalltheloadcrack,inducesmainlyhasthedirectstresscrack,thesecondarystresscracktwokinds.Thecrackwhichoutsidethedirectstresscrackisreferstowhichtheloadtocausethedirectstressproduces.Thecrackproducesthereasonincludes:

1st,designcalculationstage,whenstructurecomputationdoesnotcalculateorpartiallyleakscalculated;

Thecomputationmodelisunreasonable;

Structurestresssuppositionandactualstressnotsymbol;

Theloadlittlecalculatedorleakscalculated;

Theendogenic

forcewithmatchesthemusclemiscalculation;

Thestructuresafetycoefficientisinsufficient.Whenstructuraldesigndoesnotconsidertheconstructionthepossibility;

Thedesigncrosssectionisinsufficient;

Thesteelbarestablishmentarefeworthearrangement

mistake;

Thestructurerigidityisinsufficient;

Thestructureprocessesisimproper;

Thedesignpaperconfessionisunclearandso

2nd,theconstructionstage,doesnotlimitpilesuptheconstructionmachinesandtools,thematerial;

Didnotunderstandtheprefabricatedstructurestructurestresscharacteristic,standsupfromfailureatwill,thehoistingup,thetransportation,theinstallment;

Accordingtothedesignpaperconstruction,arbitrarilydoesnotchangethestructureconstructionorder,thechangestructurestresspattern;

Doesnotmakeunderthemachinevibrationtothestructurethefatigue

strengthcheckingcalculationandsoon.

3rd,theoperationalphase,surpassesthedesignloadtheheavyvehiclebridge;

Vehicles,shipscontact,hit;

Hasthegale,theheavysnow,theearthquake,thedetonationandsoon.

Thesecondarystresscrackisreferstothesecondarystresswhichcausesbytheoutsideloadtoproducethecrack.Thecrackproducesthereasonincludes:

1st,outsidedesignunderloadfunction,becausethethingsthepracticalworkconditionsameroutinecalculationhasdiscrepanciesorthecomputationconsidered,thuscausesthesecondarystressincertainspotstocausethestructuredehiscence.Thisplaceforexampletwoarticulationsarchedbridgesskewbackdesignoftenusesthearrangement"

X"

theshapesteelbar,atthesametimereducesthecrosssectionsizemeansdesignarticulation,thisplacethetheoreticalcalculationcanhavethebendingmoment,buttheactualthisarticulationstillcouldanti-becurved,downtoappearedthecrackbuttocausethesteelbartorustaway.

2nd,inthebridgestructureneedsthechiselgroovefrequently,opensthehole,theestablishmentcorbelandsoon,usestheaccurateschemeintheroutinecalculationtocarryontheanalogcomputationwithdifficulty,thegeneralbasisexperiencesestablishestheworkingreinforcement.Theresearchindicatedthat,afterthestresscomponentdigsthehole,thestrengthwillflowhasthediffraction,willbecrowdednearbythehole,hasthehugestressconcentration.Inlongcrosspre-stressedLiang,frequentlyincrossinneedstointerruptthesteelcontinuouslyaccordingtothesectionendogenicforcetotie,establishmentanchorage,butmayseefrequentlynearbytheanchorcrosssectiontothecrack.Therefore,ifprocessesimproper,inthesetructurescornersorthecomponentshapesuddenchangeplace,theworkingreinforcementcutoffiseasytoappearthec