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1、浙江大學(xué)博士后學(xué)位論文海洋導(dǎo)管架平臺(tái)結(jié)構(gòu)疲勞可靠性研究姓名:張立申請(qǐng)學(xué)位級(jí)別:博士后專業(yè):結(jié)構(gòu)工程指導(dǎo)教師:金偉良20001201篁圭星絲至三塹堡塹i蘭童蘭篁壟蘭童竺竺塞莖星塞竺塑塞!內(nèi)容摘要海洋平臺(tái)結(jié)構(gòu)疲勞壽命評(píng)估及維修決策系統(tǒng),是海洋工程中一個(gè)有難度而富有挑戰(zhàn)性的重要研究領(lǐng)域。本文結(jié)合中國(guó)海域的環(huán)境條件,對(duì)海洋平臺(tái)結(jié)構(gòu),特別是針對(duì)導(dǎo)管架平臺(tái)的疲勞壽命及其可靠性評(píng)估方法進(jìn)行了研究,對(duì)由此而涉及到的檢修決策問題也進(jìn)行了探討。全文主要內(nèi)容如下。首先,對(duì)海洋工程結(jié)構(gòu)疲勞壽命評(píng)估的基本方法進(jìn)行了研究,包括環(huán)境載荷、疲勞累積
2、損傷準(zhǔn)則及壽命可靠性評(píng)估的研究。給出基于全壽命模型的疲勞可靠性分析算例。其次,對(duì)進(jìn)行疲勞壽命評(píng)估中的隨機(jī)應(yīng)力分析方法進(jìn)行了研究。由波浪環(huán)境著手,經(jīng)過動(dòng)力分析以及譜分析方法確定熱點(diǎn)處響應(yīng)然后,結(jié)合工程實(shí)例進(jìn)行了基于weibull分布假設(shè)以及譜分析方法的平臺(tái)結(jié)構(gòu)疲勞壽命及可靠性的評(píng)估。最后,針對(duì)在役平臺(tái)結(jié)構(gòu)的檢修過程,進(jìn)行了考慮檢修影響的結(jié)構(gòu)疲勞可靠性分析的研究,并據(jù)此對(duì)進(jìn)行有關(guān)維護(hù)及修理的決策。從而完成一個(gè)完整的海洋平臺(tái)結(jié)構(gòu)疲勞安全可靠性評(píng)估。另外,在主要研究?jī)?nèi)容之外,還對(duì)薄壁離心鋼管混凝土構(gòu)件的抗扭性能進(jìn)行了試驗(yàn)研究
3、,取得了許多有用的結(jié)論。關(guān)鍵詞:海洋工程,結(jié)構(gòu)疲勞,可靠性,導(dǎo)管架平臺(tái),譜分析,檢測(cè),維修,薄壁離心鋼管混凝土,抗扭試驗(yàn)張立:浙江大學(xué)結(jié)構(gòu)工程研究所2000年12月!!篁圭星至塞三堡堡篁:堡童量竺堡蘭魚篁絲堡薹里塞絲竺塞ABSTRACTThefatiguelifeassessment,maintenanceandrepairsystemforoceanplatformstructureisoueofthemostimportantresearchareaswithdifficultiesandchallenges.I
4、nthereport,researchonfatiguelifeandreliabilityassessmentsforoceanjacketplatforms,especiallyforplatformsunderChineseoceanenvironment,havebeencarriedOut.TheinspectionandrepairdecisionisalsoresearchedafterwardsThecontentsofthereportcanbedividedintofourpartsasfollo
5、ws:1ResearchOiltheessentialapproachesforoceanengineeringstructuralfatiguelifeassessmentwhichincludesenvironmentloading,fatiguedamagecumulationruleandreliabilityassessmentapproaches。ApplicationoffatiguereliabilityanalysisbasedOnfull—lifemodelispresentedintheend.
6、2.TherandomstressanalysisforfatiguelifeassessmentisstudiedWaveenvironmentloading,dynamicanalysisandspectralanalysisareusedforcalculatingtheresponseofhotspot3.Weibulldistributedbasedassumptionandspectralanalysisareusedforfatiguelifeandreliabilityassessmentsofare
7、alengineeringapplication,4.Reliability-basedfatigueanalysisforoceanengineeringstructuresconsideringtheeffectofinspectionandrepairisstudied,whichcanbeusedfordecisionofinspectionandmaintenanceThen,acompleteprocessofstructuralfatiguesafetyassessmelltforoceanplatfo
8、rmiscarriedoutInaddition,aftertheexperimentalresearchofcentrifugalconcrete—filledthin—wattsteeltube,somevaluableconclusionsaboutitstorsioncapacityareobtajnedKEYWORDSOceanEng