空間網架結構的損傷識別.pdf

1、大連理工大學碩士學位論文空間網架結構的損傷識別姓名：張亮申請學位級別：碩士專業(yè)：結構工程指導教師：宋玉普20071221空間網架結構的損傷識別Damageidentificationofspacesteel鰣ds仃uctureAbstractSteel鰣dstructure，which鋤fIllfiltheneedsoflongspanspatial鋤cturcs，hasgainedgrowingpopularityathomeanda

2、bro跚LAsthis翻ructll∞hasalargespanandCanservemanypeopleallaccidentwillthreatenpeoplelifeandc眥sehugeeconomiclossesandpropertylossThere越emanycollapseendaccidentsoflongspanspatialslraettⅡesinlatestyears。soitisimportanttoident

3、ifyandmonitorspace鰣dslz仙ctureInthefieldofidentificationtherealemanymaturemethodswhich戤dividedintotwoparts：StaticandDynamicMethodsItisconvenienttogetthewholestateofstnld呲ebydynamicmethodwhichisoperatedbygettingthemodepara

4、meterssuchasfrequencyandmodeshapeandismOreusefulforspacenllssInthispaperbased011theexperimentofatnlss，modalmethodsarcusedandanalysedwiththemodepalameterssuchasfTequencyandmodeshapeobtainedbydynamicaltests啊塢validityandrob

5、ustnessofdifferentmethods虢comparedbyaddingwhitenoisetothedatumofnumericalsimulafi∞withAnsysResultsshowthatthedamageof11“RSSCanbeeffectivelyidentifiedbythemethodofmodalstrainenergyplusLSSVMOeastsqualesupportvectormachine)

6、ModalstrainenergyisusedtoidentifytheprobabledalllageelementsandtheexactdanlagelocationandextentcanbeattainedbyusingLSSVMThismethodisverifiedbynumericalsimulationofaspaceIFllS$withsomenosieFinallyoptimalsensorplacementand

7、howt0identifyspace血麟withincompletemodedataaleanalyzedbecauseitisimpossibletogetthecompletemodedataofspaceIIUSSwhichhastOOmanyelementsResultsattainedbynumericalsimulationofsignald鋤a∞elementverifythatthemethodcombinedbyeff