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上海光源工程屋盖钢管节点平面外受弯性能试验研究 1.Introduction Theroofstructureplaysanimportantroleinensuringthesafetyandstabilityofthebuilding.Theuseofsteelpipenodesintheroofstructurehasbecomeincreasinglypopularinrecentyearsduetotheirhighstrength,durability,andcost-efficiency.However,thestructuralperformanceofsteelpipenodesunderbendingconditionsneedstobestudiedtoensurethattheymeetthedesignrequirementsandstandards. TheShanghaiSynchrotronRadiationFacility(SSRF)isalargescientificresearchfacilitythatrequiresastableandsaferoofstructure.ThisstudyfocusesonthestructuralperformanceofsteelpipenodesusedintheroofstructureoftheSSRF. 2.LiteratureReview Theuseofsteelpipenodesinconstructionhasbecomeincreasinglypopular.Previousstudieshaveshownthatsteelpipenodeshavehighstructuralperformanceunderdifferentloadingconditions.However,thebendingbehaviorofsteelpipenodeshasnotbeenextensivelystudied. Studieshaveshownthatthedesignofsteelpipenodesshouldtakeintoaccounttheeffectsofgeometricimperfections,materialproperties,andenvironmentalfactors.Thefailuremodeofsteelpipenodesunderbendingconditionsisusuallycharacterizedbylocalbucklingandplastichingeformation. Numericalsimulationsandexperimentaltestshavebeenusedtostudythebendingbehaviorofsteelpipenodes.LuoandLi(2015)conductedanumericalstudyonthebehaviorofthin-walledsteelpipenodesunderbendingconditions.Theresultsshowedthattheshapeandsizeofthecross-section,aswellasthematerialproperties,haveasignificantinfluenceonthestructuralperformanceofsteelpipenodes. 3.Methodology Inthisstudy,aseriesofexperimentswereconductedtoinvestigatethebendingbehaviorofsteelpipenodesusedintheroofstructureoftheSSRF.Theexperimentalsetupconsistsofafour-pointbendingtestrig,whichappliesaloadtothetopsurfaceofthenodetosimulatethebendingconditions. Thetestspecimenswerefabricatedusingstandardroundsteeltubeswithadiameterof76.2mmandawallthicknessof4mm.Thesteelpipenodesweredesignedwithfourbranchesandsixconnections,whichwereweldedtogetherusingamanualmetalarcweldingprocess.Thespecimenswerethenheat-treatedtoelimi