26202.近海風(fēng)機筒型基礎(chǔ)的疲勞損傷研究

1、天津大學(xué)碩士學(xué)位論文近海風(fēng)機筒型基礎(chǔ)的疲勞損傷研究姓名：劉剛申請學(xué)位級別：碩士專業(yè)：水工結(jié)構(gòu)工程指導(dǎo)教師：戚藍(lán)201112ABSTRACTAsanewtypeofwindturbinefoundation，offshorewindturbinebucketfoundationislong—termincomplicatedoceanicenvironment，mainlyundertheinfluenceofdynamicloadsge

2、neratedfrombothoperationoftheupperstructureandcomplexmarineenvironmentsuchaswindandwavesStrainaccumulationofconcretematerialwillgiverisetotheprocessofintemaldamage，affectedbymanyvariables，whicheventuallyresultsinmacrocra

3、ckuntilthewholestructureisdestroyedDuototheunexpectedandheavylosses，fatiguedamagecalculationofconcretestructurehasattractedagreatdealofconcerninthedomesticandinternationalacademicorengineeringfieldAccordingtothelinearand

4、nonlinearcalculationmethods，3MWoffshorewindturbinebucketfoundationwastakenastheprototypeintothreedimensionalfiniteelementtobecalculatedbythemethodofstaticcalculationanddynamiccalculation，usingthemethodofcomparativeanalys

5、isinordertoensurethecorrectnessofresultsConcretedamagedplasticitymodelwasusedinthedynamicanalysistodefineconcretematerialsCloudoftensiledamageandcompressivedamageaboutthewholemodelandthevariouscomponentsoftheoverallstruc

6、tureinthecalculationresultscanbevisuallyobservedCombinedNorskeVeritasDNVstandardsandtheGermanGLstandardswiththefiniteelementsoftwarecreatively，theoma)【、Gminwasprovided，whichwasneededbythespecificationvalidationformulasof

7、concretefatiguepropertiesThecalculationresultswereanalyzedbythefatigueverificationforconcreteundercompressionbasedonEUROPEANSTANDARDThecomputationresultsshowthatthistypeofbucketfoundationsatisfiestherequirementofavoiding

8、fatiguedamageundercompressiveloadThemethodoffatiguedamageaccumulationbasingonSNcurveandMinerlinearcumulativedamagecriteriawasintroducedandfatigueloadspectrumcompiledmethod—rainflowmethodwasdescribedindetailTheacademicter

9、mrelatedtoconcretefatiguedamageWasalsodefinedinsystemThecomputationresultsshowthatthistypeofbucketfoundationsatisfiestherequirementofavoidingfatiguedamageundercompressiveload，butdonothaveenoughresistancetotensilefatigued