高强钢焊接工字梁整体稳定性能分析_丁阳

4521201511BuildingStructureVol．45No．21Nov．201512113000722300072。、、、、。。。TU391A1002-848X201521-0025-05InvestigationonoverallbucklingbehaviorofhighstrengthsteelweldedI-beamsDingYang12GuoPeng11SchoolofCivilEngineeringTianjinUniversityTianjin300072China2KeyLaboratoryofCoastCivilStructuresSafetyChinaMinistryofEducationTianjinUniversityTianjin300072ChinaAbstractHighstrengthsteelhasbeenappliedinthebuildingsandbridgessuccessfullybecauseofitsgoodmaterialproperties．Howeverthecorrespondingdesigncodesarenotestablished．InviewoffewdomesticresearchachievementsofoverallbucklingbehaviorofhighstrengthsteelweldedI-beamsthefiniteelementanalyseswereperformed．TheeffectsonoverallbucklingcapacityofhighstrengthsteelweldedI-beamscausedbytheinitialgeometricimperfectiontheresidualstressstrengthclassofsteelsectionheight-widthratioloadtypeandsectionformwereinvestigated．TheresultsindicatethattheincreasinginstrengthclassesofsteelresultsinthedecreasingoftheeffectsonoverallbucklingcapacityofhighstrengthsteelweldedI-beamscausedbytheinitialgeometricimperfectionandtheresidualstresses．ThecalculationfomulaforoverallbucklingcoefficientofhighstrengthsteelweldedI-beamsissuggested．Keywordshighstrengthsteelwelde[e-mail]。0460MPa、、1。、。《》GB50017—2003Q4202。Q460Q500Q550Q690、、、、。1、、。1.41.82.02.42.83.06Q460Q500Q550Q690、。。Q4601aQ500Q550Q6901b13。1εstεufu/N/mm2E/N/mm2G/N/mm2νQ4600.020.14550Q500—0.10610Q550—0.09670Q690—0.08770206×10379×1030.3εstεufuEGν。20151、Z4。32。32b。Shell1815。222.1L/1000LL/25003。-MM。MMpMp=WpfyWpfy。λbλb=γxWxfy/M槡crWxMcrγxQ460γx=1．05Q500γx=1．05。34Q460Q500Q550Q690。3341λbλbλb＞2．0。2L/2500L/1000Q460Q500Q550Q690MMp5.1%2.8%1.7%1.1%。3624521．4。2.2。M56。5651λb1.0～1.4λb。26MMp7.5%3.1%2.6%1.8%。3。2.35Q235Q460Q500Q550Q690、15Q2357。71MMpM/Mp。Q235Q460Q500Q550Q690M/Mp2.8%4.3%4.9%5.7%。2λb1.2～1.4M。Q235Q460Q500Q550Q690M6.8%8.1%10.7%14.0%。36。2014φbφb=11+λ2nb1/n≤11n7220157nhmb1、、6。61nnNii=12…62。n3NinNi/%Q460Q500Q550Q690Q460Q500Q550Q6901.41.861.781.811.912.00－4.0－2.43.17.71.81.711.631.661.751.86－4.7－2.92.28.62.01.761.611.691.731.89－8.5－4.4－1.76.92.41.661.551.631.661.84－6.6－1.6－0.210.82.81.571.491.551.561.66－5.6－1.6－0.75.73.01.531.421.511.531.62－7.0－0.70.66.5n4NinNi/%1.41.862.011.832.011.718.5－1.68.5－7.91.81.711.851.831.871.838.36.89.57.02.01.761.721.791.771.78－2.61.70.31.12.41.661.811.741.651.769.14.6－0.76.22.81.571.461.721.601.72－7.49.41.79.53.01.531.511.681.621.65－1.29.86.38.3、n。nNi3。n4。n21234561.41.82.02.42.83.0Ni1.861.711.761.661.571.53n。nnn=234－3εk'b1h槡m2b1hmεk'εk'=460/f槡y。n8。8n824521．82n12。41。。2MMp。。3nn。。1．J．20124211-7．2．ANSYSJ．2009391113-118．3．M．2014．4．M．2004．5S．2014．6．HD．2002．92