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1、重庆大学硕士学位论文II英文摘要ABSTRACTLarge-scalebridgestructuralhealthmonitoring,withitsreal-timeacquisitionofbridgestructuredegradationconditionandtimelywarning,canreducethemaintenancecostsofbridgeandpreventsuddenaccidentssuchasbridgecollapse,whichmakesbridgestructuralhealthmonitoringtheresearch
2、frontierincivilengineering.Withtheimpactofenvironmenttemperature,load,etc,operatingbridgestructuredegradationisdifficulttofinddirectlythroughthemonitoringdata.Atthesametime,duetothecomplexstructureoflargebridge,thetheoryoffiniteelementmodelcalculationresultscan'tbeconsistentwiththebr
3、idgemonitoringdata,leadingtofactthatthesafetystateevaluationbasedonconstantenvironmentandfiniteelementmodelcanhardlybeappliedtoactualbridge.Everymeasuringpointofbridgestructurehascommontrendsinstrainresponseanddisplacementresponseundertheinfluenceoftemperatureandload.Accordingtothech
4、angeofstructureresponsestatisticshappenedbeforeandafterthedamage,thepaperwillusemultivariatecontrolcharttoidentifythestructuredamagebyestablishingseparationalgorithmofeffectsbasedontheco-integrationtheory.Inthisway,wecanavoidtheinconsistencybetweencomplexfiniteelementmodelingtheoreti
5、calcalculationandpracticalmeasureofbridge,whichprovidesastrongsupportforpracticalapplicationofbridgehealthmonitoringinlargebridge.Themaincontentandresultsofthepaperareasfollows:①Throughanalyzingthemainloadeffectkindsofthelargebridge,wecansimplifythevariousloadeffectsintoatotalofthree
6、kinds,thatisconcentratedload,uniformlydistributedloadandtemperatureload.Basedontheprincipleofstructuralmechanics,wededucethedeflectionchangeruleamongdifferentpointsofsimplysupportedbeammodelunderthreedifferentloadeffects.Theresultsshowthatunderthesameloadeffect,thereisalineartrendbet
7、weeneachpointdeflectionofthestructure;②Makethestructuralresponseoflong-termmonitoringdataatimeseriesdata,useJohansenmethodtodeterminecointegrationmodelofdata,representthestructuralresponsedataeliminatedfromtheeffectthroughco-integrationallowancedatacalculatedbythemodel,andwecanestabl
8、ishaseparati