曲线薄壁箱梁的几何非线性分析

《曲线薄壁箱梁的几何非线性分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、ABSTRACTDuet0theeXcellenccoftofsionalsti恤ess，economy觚daestheticappea姗ce，cIlryedboxgirder喇dgearewidelyusedinurb觚0ve叩ass锄dviaductsystems．Atthes锄etime，thespanofcllrvedboxgirdefbfidgeisiI埘easedC0nstantly，thenonlineareffect0fcuⅣebox酉rderw勰graduallyhigllligllted，itisnecessaryt0carr)routthe

2、rcse鲫chofgeometr)rnonlinearofthccIlⅣet11in-walledbox西rder．Accordingtothemech褫icalcharactefist豳ofthecuⅣebox西rderbridgcinverticalstI-essmainIy，baSedonlinearelasticanalysisofthecuⅣethin．walledbox西rderincludedinthewa叩effeCt，onlyconsiderVenicaldiSplac锄ent0fboxgirderforlargediSplac锄锄t，tlle

3、jncr锄∞talfb肋0fvinualworkcquation锄dfinitcelem髓tcolu姗typeaboutgeometricnonlinearwereprcsented，andthefiniteelememprog阳msofgeometricnonlinear锄alysiswercproduced．AcCordingt0those，themaincontentsandresultsareasfbllows：①Inthisdissenatjon，conside咖gthenoncoincidenccoftorsionalccnter趾d伊avityce

4、nterandtheinfiuenccofiIlitialcIlrvature，thev撕able．cIlⅣaturcIbox{；!irderwithrect柚gularcrosss鳅iOnwereestablished．TlhedispIacementequationconsideringwarpingtorsion0f锄ypointincun，ebox酉rderwaspresented，accofdingtotlletheofyofthree·dimensionalspacenonlinearf噜nitedisplac锄铋t，underthepremiset

5、hatitisbeen私sumedthatonlyVerticaldisplacementSarelargedisplacement，thegeometI记nonlinearstrain-displacementrelationship如dtherclationshipofstrainincrem曲t柚ddiSplacem曲tincrementwercpresented、张rcdeducted．Finally'theillcrementalf0加0fgeometricnonline甜VirtualworkequationofCllrvethin．walledbo

6、x酉rderconside血gw唧ing-torsionalefIbctwasestablished．②Thethree-nodeisopar锄etricfiniteel锄entmodel0fcllrceboxgifdef、枷lhrectangIllarcrosssection觚d0nlyayenicalsymmet珂aXis，thateachnodehavesevende酎eesof矗cedom，foranalysis0fspacegeometr主calnonlinearwasestablished．IIltroducingashapefunctionasad

7、ifferencevaluefunctionofthecoordinatesaofanvpojntj11unitandthediSplace加ent，the锄y0fdisplacement觚ddisplacementincrementalarray0fanypointinunitwerepresented，andthematrixofdisplacement-strainrelationaIldthematrixofincrcmentaldisplacement．incrementalstrainrelationofisoparametriccuⅣeboxgir

8、derwerededuc