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时间:2019-05-13
《基于热点应力法的正交异性钢桥面板疲劳寿命评估》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2014年第44卷第4期(总第227期)62BridgeConstruction,Vo1.44,No.4,2014(TotallyNo.227)文章编号:1003—4722(2014)04—0062—06基于热点应力法的正交异性钢桥面板疲劳寿命评估崔闯,卜一之,张清华,李丽娟(1.西南交通大学,四川成都610031;2.中铁大桥局集团桥科院有限公司,湖北武汉430034)摘要:正交异性钢桥面板构造复杂,其疲劳性能由各疲劳细节共同决定,既有规范推荐的寿命评估方法已不能满足设计要求。为准确评估其疲劳寿命,引入热点应力法,根据Eurocode规
2、范确定疲劳检算加栽工况和荷载谱;采用国际焊接协会I1w推荐的外推方法,计算其关键易损部位热点应力谱;采用泄水法对热点应力谱进行分析,通过热点应力S-N曲线和线性累积损伤理论计算其寿命。以某城市立交桥典型正交异性钢桥面板为研究对象,采用热点应力法评估其疲劳寿命。结果表明:该桥的疲劳寿命为103年,满足设计要求且有一定安全储备量;与名义应力法相比,热点应力法能够有效避免复杂应力状态下名义应力难以定义的问题,更适用于正交异性钢桥面板的寿命评估。关键词:正交异性钢桥面板;疲劳性能;疲劳寿命;评估;热点应力法;有限元法中图分类号:U443.31文献标志码:
3、AFatigueLifeAssessmentofOrthotropicSteelDeckPlateBasedonHotSpotStressMethodCUIChuang,BUYi一互JlZ,ZHANGQing—hua,LILi-juan’(1.SouthwestJiaotongUniversity,Chengdu610031,China;2.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034,China)Abstract:Th
4、efatiguepropertiesoforthotropicsteeldeckplatecanbedeterminedbythevari—OUSfatiguedetailsbecauseofthecomplexstructureoftheplateandthelifeassessmentmethodsrecommendedinthecurrentcodeshavebeenunabletomeetthedesignrequirements.Toexactlyassessthefatiguelifeoftheplate,thehotspotstre
5、ssmethodwasintroduced.Thefatiguechec—kingloadingcasesandloadspectrumweredeterminedinaccordancewiththeEurocodeandthehotspotstressspectrumofthecriticalandvulnerabledetailsoftheplatewascalculatedbytheextrapolationmethodrecommendedbytheInternationalInstituteofWelding(IIW).Thehots
6、potstressspectrumwasthenanalyzedbythereservoirmethodandinaccordancewiththehotspotstressS~Ncurvesandthelinearcumulativedamagetheory.thefatiguelifeoftheplatewascalculated.Thetypicalorthotropicsteeldeckplateofacityinterchangewastakenastheresearchobjectandthefatiguelifeoftheplate
7、wasassessedbythehotspotstressmethod.Theresultsoftheassessmentrevealthatthefatiguelifeoftheplateoftheinterchangeis103years.Thefatiguelifecanmeetthedesignrequirementsandhasacertainsafetymargin.Ascomparedwiththenora—inalstressmethod.thehotspotstressmethodcaneffectivelyavoidthepr
8、oblemsthatarediffiCUIttobedefinedbythenomina1stressmethodinthestateo
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