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1、附录StudyontheProprietyofRayleigh’sDampinginNonlinearDynamicAnalysisofBridgesSummaryInthispaper,basedontheresultsofcomparisonofnonlineardynamicanalysisof5spanbridgesconstructedontheI、Ⅱ、Ⅲregionsbythetwomethod(e.g.strain-energyproportionaldampingmethod&Rayleigh’sdampingmethod),parametricstudywer
2、emadetothemaximumbendingcurvatureofthepiers.Astheresults,itisfoundthattheRayleigh’sdampingmethodbringsacomparativelysmallapproachtothebendingcurvatureinmanycasescomparingwiththestrain-energyproportionaldampingmethod,andthebendingcurvaturevariousinacomparativelylargerareas.Andalso,comparative
3、lycomputationsweremadetoacomplexbridgestructures,e.g.14spanbridgeanda3spancurvedbridge.SuggestionwasmadeonthepracticaluseoftheRayleigh’sproportionaldampingmethod.Keyword:nonlinear,dynamicanalysis,thestrain-energyproportionaldampingRayleigh’sdamping,bridges,themaximumbendingcurvature1.Introdu
4、ctionAfterthenewaseismiccodeofbridgedesignpublishedintwoyearsagoinJapan,theRayleigh’sdampingmethodareoftenusedinnon-lineardynamicanalysisofbridgessincetheassumptionofdampingmatrixC=αK+βM,thetimeofcalculatingisshorterthanothermethod.Butthroughthecomputationtothemanyengineeringproblem,itshowst
5、hattheresultsbyRayleigh’sdampingmethodarevariouswiththedefinitionoftheparameter.Andalso,itisfoundthatthediscontinuesofbendingmomentweretakenplaceinsomepracticalanalysis.Inthispaper,basedontheresultscomparisonofnonlineardynamicanalysisof5spanbridgesconstructedontheI、Ⅱ、Ⅲregionsbystrain-energyp
6、roportionaldampingmethod&Rayleigh’sdampingmethod,parametricstudyweremadetothemaximumbendingcurvatureofthepiers.Andalso,comparativelycomputationsweremadetoacomplexbridgestructures,e.g.14spanbridgeanda3spancurvedbridge.2.TheStudytotheCommonTypeofBridges2.1AnalysisModelThe3bridgestobeanalyzedwe
7、reselectedaccordingtotheconditionsoffoundationsituatedinthedifferentregions.Bothofthemwere5spancontinuesbridgeswiththerubberbearing.ThebasicconditionsofthebridgeswereshowedinFig.1.ThestandardearthquakewavefrombridgecodeofJapanwereinputatthebaseofpi
