城市立交橋中異形箱梁的有限元分析.pdf

1、浙江大學碩士學位論文城市立交橋中異形箱梁的有限元分析姓名：劉斌申請學位級別：碩士專業(yè)：橋梁與隧道工程指導教師：葉貴如20040201AnalysisonIrregularBoxBeamsinCityFlyingJunctionUsingFEMAbstractByanalyzingthreetypicalirregularboxbeamsofShangdeflyingjunctioninhangzIlouusingthethree—dim

2、ensionalFEM，someproblemsinthedesignofirregularboxbeamthatisoftenadoptedincityflyingjunctionhavebeenstudieddeeplyComparingtheresultsofoneirregularboxbeamobtainedbythegridironmethodtothatbyFEM，thecharacteristicsoftheapplic

3、ationscope，meritsanddrawbacksofthegridironmethodareconvincedItisshownthatthegridironmethodunderestimatestheresultsincontrasttoFEMwhenanalyzingirregularboxbeamsMeanwhile，themoreregularthestructuresunderconsiderationare，th

4、ebetterprecisionofthegridironmethodisexhibitedSoWemustthinkmuchofthisdifference，andWecansaythismethodisonlyapplicableforsimplystructuresandregularcomponentsofastructureInordertoenlightenwhetherincreasingthewidthofthehidd

5、enbeamCanenforcethestabilityandsecurityofthecrotch，anotherirregularboxbeaminShangdeflyingjunctionisinvestigatedusingFEM，ItindicatesthatthewidthincreaseofthehiddenbeamcannotoptimizethedistributionoftheStreSSeSofthestructu

6、reConverselythisactionevenprobablyincreasesthestressesnearthecrotchandthusmakesthestructuremoredangerThereforewhendesigningthistypeofstructures，bigeyesshouldbethrownonpropersizeofhiddenbeamNextathreespancnwecontinuousbox

7、beamhasbeenstudiedbyFEM，andhowtosetthesinglepedestalpierincnD／econtinuousboxbeamshasbeendiscussedWhensettingthesinglepodestalpierthevehicleflowshouldbeinspectedfirstlyandthenabestoffsetdistanceshouldbeselectedwithinthefe

8、asiblerangeoftheoffsetdistanceMeanwhile，increasethespacingintervalofthedoublesupportstothelargestextentwheninstallingadoublesupportsonasharingsinglepedestalpierwhichcanenhancethestabilityandsecurityofthebridge船awholeKeyw