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1、METHODSOFSTRAINMEASUREMENTSINCONSTRUCTIONMONITORINGSYSTEMSVygaudasKvedarasRokasKvedarasVilniusGediminasTechnicalUniversityVilniusGediminasTechnicalUniversityNaugarduko41,LT-03227,Vilnius,LithuaniaNaugarduko41,LT-03227,Vilnius,Lithuaniavygaudas.kvedaras@el.vg
2、tu.ltrokas.kvedaras@el.vgtu.ltRičardasMasiulionisVilniusGediminasTechnicalUniversityNaugarduko41,LT-03227,Vilnius,Lithuaniaricardas.masiulionis@el.vgtu.ltABSTRACTResultsofanalysisofrecentaccidentsinpublicbuildingsarepresented.Itisshownthatconstructionstateid
3、entificationsystemsareintegralpartofpublicandlocalwarningandsecuritysystems.Structureofconstructionofstateidentificationsystemisproposedandanalysed.Itisestablishedthatinordertoensurewideusageofsuchsystemsitisnecessarytosolvesomescientificproblems.Solutionfor
4、multipointmeasurementofstrainasoneofthemostimportantparameterforconstructionstateidentificationisproposed.Itisshownthatmeasurementsofstrainbyusingclosed-loopself-balancingsystemensurenecessaryresolutionwithhighaccuracyandcanbeusedinmultipointmeasurements.Two
5、closed-loopself-balancingsystemsusingdigitallybalancedWheatstonebridgeandbalancingofcurrentsarepresentedandanalysed.KEYWORDSStainmeasurement,Multi-channelstrainmeasurement,DigitallyBalancedWheatstoneBridge,DigitalbalancingofcurrentsEuroperecently–inLithuania
6、,Russia,Polandand1.INTRODUCTIONGermany.MostfrequentlysuchcollapsesoccurSeveralbuildingsconstructedoflightweightsteelorduringwintertimewhenstructuresareexposedtoconcretestructureshavecollapsedinrecentyears.additionalloadbecauseofthesnowandicewhichisUnfortunat
7、elyinsomeofthesecollapsespeopleaccumulatingonaroof,strongwinds,andotherliveswerelostandeverycasehugefinanciallossesexposuresthatoverloadthestructuresoftheweresustained.Therewereseveralaccidentsinthebuilding.34310Itwouldbepossibletosavehumanlivesifpeoplemodul
8、usofelasticityE=6,89·10Pa,forceofsizewerenotifiedaboutacriticalconditionofbuildingF=1000Nisappliedtherelativestrainwillbestructuresatleast10–20minutesbeforecollapse.Incaseitisknownofcriticalcond
