带过焊孔焊接细节疲劳性能优化及试验研究.pdf

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1、桥梁建设２０１７年第４７卷第２期（总第２４３期）BridgeConstruction，Vol．４７，No．２，２０１７（TotallyNo．２４３）３７文章编号：１００３－４７２２（２０１７）０２－００３７－０５带过焊孔焊接细节疲劳性能优化及试验研究廖平，卫星，肖林，唐继舜，赵人达（西南交通大学土木工程学院，四川成都６１００３１）摘要：为了提高带过焊孔焊接细节的疲劳寿命，以某钢桁梁桥为背景，针对其翼缘板和斜腹杆的焊接构造，通过在过焊孔处填半圆弧板和焊缝错开的形式对其疲劳性能进行优化，制作带过焊孔焊接细节和优化模型的试件，进行疲劳试验测

2、试其疲劳寿命，并结合有限元分析对比各模型的疲劳性能，验证优化措施对疲劳性能的改善效果。结果表明：在过焊孔处填半圆弧板可有效改善带过焊孔焊接细节的局部应力集中现象，提高其疲劳寿命，在高应力幅作用时效果更加显著；对接焊缝错开可显著提高带过焊孔焊接细节的疲劳寿命，其改善效果优于在过焊孔处填半圆弧板，在实际工程结构中推荐优先采用。关键词：钢桁梁桥；焊接；过焊孔；疲劳性能；优化设计；疲劳试验；焊缝中图分类号：U４４８．３６；U４４１．４文献标志码：AOptimizationandExperimentalStudyofFatiguePerform

3、anceofWeldedDetailswithCopeHolesLIAOPing，WEIXing，XIAOLin，TANGJishun，ZHAORenda‐（SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu６１００３１，China）Abstract：Toimprovethefatiguelivesoftheweldeddetailswiththecopeholes，asteeltrussgirderbridgewascitedasanexampleandwithr

4、egardtotheweldedstructuresoftheflangeplateanddiagonalwebmemberofthebridge，thefatigueperformanceoftheweldedstructureswasopti‐mizedbymeansoffillingthesemicirculararcplatesandstaggeringtheweldedjointsatthecopeholes．Thespecimensoftheweldeddetailswiththecopeholesandtheoptimi

5、zationmodelswereprepared，thefatiguetestsforthespecimensweremadeandthefatiguelivesofthespecimenswereexamined．Withreferencetothefiniteelementanalysis，thefatigueperformanceofthedifferentoptimizationmodelswascomparedandtheeffectoftheoptimizationontheimprovementofthefa‐tigue

6、performancewasverified．Theresultsdemonstratethatthefillingofthesemicirclearcplatesatthecopeholescaneffectivelyimprovethelocalstressconcentrationintheweldeddetailswiththecopeholes，improvethefatiguelivesoftheweldeddetailsandtheeffectisevenmoresignifi‐cantunderthehighstres

7、samplitude．Thestaggeringoftheweldedjointscansignificantlyimprovethefatiguelivesoftheweldeddetails，theeffectoftheimprovementisbetterthanthatofthefill‐ingofthesemicirclearcplatesanditishencerecommendedthatthepriorityshouldbegiventotheapplicationofthestaggeringoftheweldedj

8、ointstothepracticalengineeringstructures．Keywords：steeltrussgirderbridge；weld；copehole；fatigueperformance；opti