大跨度连续钢桁梁拱桥极限承载力研究与非线性因素影响分析

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1、西南交通大学硕士学位论文大跨度连续钢桁梁拱桥极限承载力研究与非线性因素影响分析姓名：方绪镯申请学位级别：硕士专业：桥梁与隧道工程指导教师：郑史雄20090301西南交通大学硕士研究生学位论文AbstractTmSthesismainlystudieStheultimatebearingcapacityandanalysestheinfluenceofnon．1inearfactorsonlong-spansteeltrussedarchbridges．MainlYworkisdoneasfollow：．1．Thetheoreticalknowledgewh

2、ichanalyzingtheproblemneedsforisintroducedcomprehensively．Ineludingthetheoryaboutstabilityofthestructure．thetheoryaboutcalculationthenon．1inearfactorsofmaterialsandgeometrywhichcanbeusedincalculatingthelong—spanbridges，thetheoryaboutresearchmethodsofstudyingtheultimatebeatingcapac

3、ityofbridgesandSOon．2．nebackgroundforengineeringstudyingisNanjingDashengguanBridge．Fimte．elementsoftwareANSYSisusedforanalyzingthebridge．Firstly，theultimatebearingcapacityoftheNanjingDashengguanBridgeisascertainedinbelowthreecircumstances：linearelastic，consideringthegeometricnon·l

4、inearonly，consideringthegeometryandmaterialsdualnon-linear．Thenmakeadetailedcomparisonofthreecases，drawntheultimatebearingcapacityofsteeltrussedarchbridgebesubjectedtonon—linearfactors．Secondly，theultimatebeatingcapacityoftheNanjingDashengguanBridgeisalsoascertainedinthecasesofdif

5、ferentwindspeedWhichasdifferenthorizontalwindloadsactonbridge．Makingadetailedcomparisonofdifferentcasestoo．concludinginfluenceofhorizontalwindloadsontheultimatebearingcapacityofthebridgestructure．SotherightultimatebearingcapacityofthebridgestructureCanbeobtain，itprovidesascientifi

6、cbasisforlimited．designing．Thestructure’sformofdamageCallbeknowclearly,alSOthestructure’SsecurityreserveunderthecertainloadorthecapacityofoverloadalSOCanbeknowaccurately．A11theseCanprovideabasisandprotectioninconstruction,operation，safetymanagementofthebridgestructure．3．髓egenerall

7、oadandultimateloadactingonthebridgeareanalyzed．thentheintemalforcesanddeformationinsuchtWOcasesarecompared．Sotheinfluenceofthenon．1inearfactorsonsteeltrussedarchbridgecanbeconcluded，itcanbeusedintheprocessofdesigning．Keywords：long—spansteeltrussedarchbridges；ultimatebearingcapacit

8、y；non—linearfactor；horizontalwind