模態(tài)曲率差值法在簡支梁橋健康監(jiān)測和損傷識別中的研究.pdf

1、蘭州理工大學碩士學位論文模態(tài)曲率差值法在簡支梁橋健康監(jiān)測和損傷識別中的研究姓名：花尉攀申請學位級別：碩士專業(yè)：橋梁與隧道工程指導教師：狄生奎20100419模態(tài)曲率差值法在簡支梁橋健康監(jiān)測和損傷識別中的研究AbstractMostoftheengineeringstructures，whensubjectedtothenaturaldisasterssuchasearthquake，fireandtheactionofthelongte

2、rmfatigueloadingorerosion，thedamageofthestllJctureiscausedWiththeaccumulationofthedamage，itscriticalitywillbeenhancedgraduallyAfterjudgingthestructuredamageandconfirmingthelocalityofthedamage，realtimerepaircanbedoneorthe

3、meansoftheoperationofchangingthestructurecanbechanged，SOasteducetheaccumulationdegreeofthedamageofthestructureandtheeconomylossStructuraldamagedetectionincivilengineeringisanewresearchfield，whichhasnotyetformedaunifiedth

4、eoryandmethodofsolving，andisstillintheinitialstageofdevelopmentInthispaper，damageidentificationofbridgestructureisstudiedbyusingthedifferenceofmodalcurvaturemethodsThepaperisdividedintofivechaptersSpecificstudiesareasfol

5、lows：(1)Describedthesignificance，contentsandmethodsofthedamageidentificationofbridgestructure，researchstatusandresultsofdamageidentificationinChinaandabroad，andthescopeofthepaperandthemainresearchcontents(2)Discussedtheh

6、ealthmonitoringoflargebridgeandthecontentsofsafetytesting，aswellasthetheoriesofhealthmonitoringandsafetytesting，andexplainingthegreatsignificanceofbridgestructuralhealthmonitoring(3)Whilesimplysupportedbeamsufferwithdiff

7、erentloadconditions，thevirtualworkprincipleofstructuralmechanicsareusedtodeducethedamageformulaofsimplebeambridgebeforeandafterthecurvaturedifference，obtainindexofthemodalcurvaturedifferenceanddamagelocationanddegreeofin

8、juryofsimplesupportedbeamsTherelationshipbetweenstrainandcurvature，whichcanworkoutthecurvaturebyusingmodeshapeandstrainaredescribed，andprovidedatheoreticalbasisfortheprocessofthecurvaturedifferenceintheactualdetection，wh

9、ichprovesthehigherpositioningaccuracyandsensitivityofthemethodoflocatingthedamageofstructure(4)Discussedthetheoreticalbastsofcurvaturemodalanalysisindetail，analyzedtherelationshipofcurvaturemodal，strainmodeandmodeshapes；

10、respectivelyusedmodeshapeandstrainmethodtoseekcurvaturemode，andusedthecurvaturedifferencemodalmethodtodoanalogycomputationtothedamageofsimplysupportedbeamTheworkingconditionsare’dividedintofivetypestoanalyzeresearchandco