海洋平臺(tái)T型管節(jié)點(diǎn)應(yīng)力分布研究.pdf

1、煙臺(tái)大學(xué)碩士學(xué)位論文海洋平臺(tái)T型管節(jié)點(diǎn)應(yīng)力分布研究姓名：張國(guó)棟申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：曲淑英邵永波20080315煙臺(tái)大學(xué)碩士學(xué)位論文煙臺(tái)大學(xué)碩士學(xué)位論文IIAbstractFatiguefailureisoneofthemostcommonfailuretypesfweldedtubularjointsundercyclicloadsintheirsevereserviceenvironmentofoffsheeng

2、ineering.GenerallythefatiguelifeoftubularjointscanbeestimatedbyreferringtoSNcurvemethodwhichdependsontheaccuratepredictionofstressconcentrationfact(SCF)stressdistributionftubularjointsundergeneralloadconditions.Theparame

3、tricequationsfthestressdistributionaredeficientallofthemwerederivedfromtheshellelementssotheprecisionissuspected.InthisstudynumericalmodelingwillbecarriedoutftheanalysisofthestressconcentrationfactsoftubularTjointsubject

4、edtoaxialinplaneoutofplanloadingtheeffectoftheweldonthestressconcentrationfactofTjointwillbeconsidered.20nodequadraticsolidelementswillbeusedtomodelthewholestructure.Suchelementscanbeusedtomodeltheweldaccurately.Thenthee

5、ffectoftheweldcanbeconsideredaccdingly.Subzonemeshgenerationmethodisusedinthenumericalmodeling.Thewholestructureisdividedintoseveralzones.Afterthatthemeshofeachzoneisgeneratedseparately.Thismethodcancontrolthemeshquality

6、easily.Afterthemeshofeachzoneisgeneratedthemeshofthewholestructurecanbeobtainedbymergingthemeshofallthezones.ThereafterthemagnitudethedistributionofthestressconcentrationfactsalongtheweldtoeftubularTjointssubjectedtoaxia

7、linplaneoutofplanloadingsareanalyzedusingABAQUSsoftware.FinallythroughtheFEanalysisof816modelstheeffectsofgeometricalparametersonthestressconcentrationfactvaluestheirdistributionareinvestigated.BasedontheresultsoftheFEan

8、alysisofTjointstheparametricequationsofthemaximalSCFofthechdbracefTjointssubjectedtoaxialinplaneoutofplanloadingshavebeenpresented.Erranalysisoftheseparametricequationshasalsobeenconducted.Thentheresultsofparametricequat