拱脚位移对圆拱屈曲性能影响的研究

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1、西南交通大学硕士学位论文拱脚位移对圆拱屈曲性能影响的研究姓名：邓一三申请学位级别：硕士专业：固体力学指导教师：高庆20080901西南交通大学硕士研究生学位论文第1I页AbstractWiththerapiddevelopmentoftrafficandarchitectureofchina，displacementofskewbackoflargequantitiesexistingarch—bridgeandarchstructurehaveoccurredcontinuously．So，thestudyofeffectsof

2、displacementofskewbackonbucklingperformanceofarchprovidenecessarytheoreticalbasisforsecurityanalysisofarch．Takingcirculararchwithfixedsupportsastheresearchobject，theadditionalinternalforcesduetoverticaldisplacement，horizontaldisplacementandangulardisplacementofskewbac

3、karecalculatedbyelasticitycentermethod．Then，theformulaeoftotalpotentialenergybasedondisplacementsofskewbackareestablished．Accordingtotheenergycriterionofstructuralstability,thebalanceequationsareobtainedbyfirst—ordervariationoftotalpotentialenergy．Inthesameway,theequi

4、libriumstabili够equationsofsymmetricalbucklingandanti·symmetricalbucklingareobtainedbysecond—ordervariationoftotalpotentialenergy．Next，bucklingloadsofarchCanbeworkedoutbymeanofthesimultaneoussolutionofbalanceequationsandequilibriumstabilityequations．Accordingtotheabove

5、results，theeffectsofthreekindsdisplacementsofskewbackonbucklingloadsandbucklingmodesofarchareanalysedandcompared．Thechangesofeffectsofpre-bucklingdisplacement，slendernessratioandopeningangleofarchonbucklingperformanceofarchalestudied．Thefollowingconclusionscanbedrawnf

6、romaboveresearch．(1)Displacementsofskewbackgenerallyleadtothedecreaseofbuckling10adofarch．(2)Theeffectsofdisplacementsofskewbackonbucklingloadarechangedbyopeningangleofarch．(3)TIleeffectsofdisplacementsofskewbackonbucklingloadaremoreevidentwiththedecreaseofslenderness

7、ratioofarch．西南交通大学硕士研究生学位论文第1II页(4)Theeffectsofpre—bucklingdisplacementOnbucklingloadarevariedwithdisplacementsofskewback．(5)Thedividingvaluesofgeometricparameterofarcharealteredbydisplacementsofskewback．KeyWords：displacementofskewback；bucklingload；bucklingmode；energy

8、method西南交通大学曲南父遗大罕学位论文版权使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定，同意学校保留并向国家有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权西南交通大学可以将本论文的全部或部分内容编入