基于热点应力法的正交异性钢桥面板疲劳寿命评估

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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