基于應(yīng)變模態(tài)技術(shù)的橋梁損傷識(shí)別.pdf

1、西南交通大學(xué)碩士學(xué)位論文基于應(yīng)變模態(tài)技術(shù)的橋梁損傷識(shí)別姓名：孫家升申請學(xué)位級(jí)別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：祝兵20080101西南交通大學(xué)碩士研究生學(xué)位論文第1I頁AbstractStructuraldamageidentificationisthecoreofthehealthmonitoringsystemofbridgeThepurposeofbridgedamagedetectionistoidenti矽thelocat

2、ionandtheextentofb五dgedamagesbasedonthecharacteristicsrepresentedbybridgeThemethodsofbridgedamageidentificationmainlyincludethreekindssuchaSstatic，dynamicandintelligentmethodThetheoryandapplicationofdetectiontechniquefor

3、bridgedamagebasedonthestrainmodeismainlyinvolvedinthisthesisAccordingtothebridgemodeshapechangebeforeandafterdamage，thedifferenceofthestrainmodechangeisobtainedandusedasthedamageindextoidentifybridgedamageTheuseofcentral

4、differencemethodformodalparameterinthestrainmodemethodcansolvethecontradictionbetweenlessmeasurepointsandtheguaranteeofidentificationprecisionTheoperationandplotprogramaledevelopedbyusingtheExcelt001Aslongaslowerstepvibr

5、ationshapesofthebridgeareinput，thegraphicrepresentationofdamageidentificationandthenumericalresultswillbeobtainedInthisthesisthenumericalsimulationandcalculationanalysisofthedamagearepresentedforasimplesupportedbeamandac

6、ontinuousbeam，thedamageofbridgeissimulatedbYthestiffnessreductionofthedement；themodeshapeiscomputedbYthesoftwareofMidasAndthestrainmodedifferencecomputedbycentraldifferencemethodisusedtoidenfi矽thedamageThenumericalresult

7、sshowthatthedamageofasimplesupportedbeamoracontinuousbeamCanbeidentifiedexactlybyuseofthefirstfivemodesWhenthebridgeisanalyzedinthesameorderstrainmode，thestrainmodedifferenceisincreasedwiththeincreaseofthedegreeofdamageF

8、orthesamedegreeofdamage，thestrainmodedifferenceisincreasedwitIltheincreaseofthestrainmodalorderTherefore，thestrainmodetechnologycanbeusedinthedamageide【Itifica缸o(hù)nofbridge；ithasdefinitevalueinthebridgedetectionKeyword：bri