局部构造对钢箱梁关键焊缝疲劳性能的影响分析

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1、桥梁建设2014年第44卷第2期(总第225期)BridgeConstruction，Vo1．44，No．2，2014(TotallyNo．225)43文章编号：1003—4722(2014)02—0043一O7局部构造对钢箱梁关键焊缝疲劳性能的影响分析邓扬，刘扬，李爱群(1．长沙理工大学土木与建筑学院，湖南长沙410004；2．东南大学土木工程学院，江苏南京210096)摘要：为给车辆荷载作用下钢箱梁的抗疲劳设计提供依据，对钢箱梁局部构造对其关键焊缝疲劳性能的影响进行研究。采用有限元方法计算了钢箱梁焊缝在单轮移动荷载下的应力曲线，在此基础上分析了纵向加强桁架对钢箱梁关键焊缝疲劳应力范围和

2、疲劳损伤的影响。计算、分析表明，纵向加强桁架增大了钢箱梁临近区域顶板的竖向刚度，并改变了其临近焊缝细节的受力状态，这使得纵向加强桁架附近焊缝的疲劳应力和疲劳损伤远小于相同位置无纵向加强桁架的钢箱梁焊缝的值；局部构造差异对钢箱梁桥面关键焊缝疲劳性能的影响明显，在钢箱梁抗疲劳设计中应予以考虑。关键词：钢箱梁；局部构造；焊缝；疲劳应力；正交异性钢桥面；纵向加强桁架；有限元法中图分类号：U448．213；U441．4文献标志码：AAnalysisofEffectofLocalStructureonFatiguePerformanceofCriticalWeldingSeamsofSteelBoxG

3、irderDENGYang。LIUYang。LJAi—qun(1．SchoolofCivilEngineeringandArchitecture，ChangshaUniversityofScienceandTechnology，Changsha410004，China；2．SchoolofCivilEngineering，SoutheastUniversity，Nanjing210096，China)Abstract：Toprovidebasisforthefatiguedesignofthesteelboxgirderundertheactionofvehicleload，theeffe

4、ctofthelocalstructureofthegirderonthefatigueperformanceofthecriti—ca1weldingseamsofthegirderwasstudied．Thefiniteelementmethodwasusedtocalculatethestresscurvesoftheweldingseamsofthegirderunderthesinglewheelmovingloadandontheba—sisofthecalculation，theeffectofthelongitudinalstiffeningtrussarrangedint

5、hegirderonthestressrangesandfatiguedamagesofthecriticalweldingseamswasanalyzed．Theresultsofthecalculationandanalysisshowthatthelongitudina1stiffeningtrussincreasestheverticalstiffnessofthetopplateofthegirderintheadjacentareaofthetrussandalsochangestheforceconditionsoftheweldingseamdetailsnearby，wh

6、ichmakesthefatiguestressandfatiguedamagesoftheweldingseamsnearbyfarlessthanthoseoftheweldingseamsinthesamepositionwithoutthestiffeningtruss．Theeffectofthedifferencesofthelocalstructureonthefatigueperformanceofthecriticalweldingseamsinthegirderdeckissignificantandinthefatiguedesignofthegirder，theef

7、fectshouldbeappropriatelytakenintoaccount．Keywords：steelboxgirder；localstructure；weldingseam；fatiguestress；orthotropicsteelbridgedeck；longitudina1stiffeningtruss；finiteelementmethod收稿日期：2013—10—09基金项目：国家自然科学基金资助项