解析u肋与横隔板焊接构造细节疲劳强度研究

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1、学兔兔www.xuetutu.com桥梁建设2014年第44卷第3期(总第226期)BridgeConstruction，Vo1．44，No．3，2014(TotallyNo．226)63文章编号：1003—4722(2014)03—0063—06U肋与横隔板焊接构造细节疲劳强度研究陈一馨，吕彭民，李大涛(长安大学道路施工技术与装备教育部重点实验室，陕西西安710064)摘要：为研究在车辆荷载反复作用下，正交异性钢桥面板U肋与横隔板焊缝构造细节处的疲劳强度是否满足疲劳设计要求，以九江长江公路大桥钢箱梁结构为研究对象，设计疲

2、劳试样进行疲劳试验，得到了用于该构造细节处疲劳寿命评估的失效概率分别为50及2．3的应力幅～循环次数曲线，参照Eurocode3规范，将疲劳曲线延长至长寿命区，提出适合该细节处的疲劳设计曲线及方程。依据实测车辆荷载谱及简化的有限元模型，选择合理的加栽方式与荷载冲击系数，计算得到关注点的应力～时间历程曲线，并评估该构造细节的疲劳寿命。结果表明，在实测荷载谱作用下，该细节处最大应力幅值为24．49MPa，小于疲劳截止限，其疲劳强度满足疲劳设计要求。关键词：钢桥；正交异性钢桥面板；横隔板；焊缝；疲劳设计曲线；疲劳强度；疲劳验算中

3、图分类号：U448．36；U441．4文献标志码：AStudyofFatigueStrengthofStructuralDetails0fU—RibandDiaphragmWeldingJointsCHENYi—xin，LUPeng—min，LJDa—tao(KeyLaboratoryofRoadConstructionTechnologyandEquipmentofMinistryofEducation，ChanganUniversity，Xian710064，China)Abstract：Tostudyifthefat

4、iguestrengthofthestructuraldetailsofU—ribanddiaphragmweldingjointsoftheorthotropicsteelbridgedeckplatescanmeetthefatiguedesignrequirementsundertheactionofrepeatedvehicleload，thesteelboxgirderstructureofJiujiangChangjiangRiverHighwayBridgewastakentheresearchobject，

5、thefatiguesamplesweredesigned，thefa—tiguetestswerecarriedoutandthestressamplitude~numbersofcyclingcurveswiththefailureprobabilityrespectivelybeing50and2．3forassessmentofthefatiguelifeofthestructuraldetailswereobtained．WithreferencetotheEurcode3，theobtainedfatiguec

6、urveswereextendedtothelifezoneandthefatiguedesigncurvesandequationsthatweresuitableforthestructuraldetailswereproposed．Basedonthemeasuredvehicleloadspectrumandthesimplifiedfiniteele—mentmodel，theproperloadingwaysandloadimpactingcoefficientswereselected，thestressti

7、mehistorycurvesoftheconcernedpointswerecalculatedandthefatiguelifeofthestructuraldetailswereassessed．Theresultsofthecalculationandassessmentshowthatundertheactionofthemeasuredvehicleloadspectrum，themaximumstressamplitudevalueofthestructuraldetailsis24．49MPa，theval

8、ueislessthanthefatiguecut—offlimitandthereforethefatiguestrengthofthestructuraldetailscanmeetthefatiguedesignrequirements．Keywords：steelbridge；orthotrop