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大跨径悬索桥爆破地震动力响应研究 Abstract Bridgesareanessentialpartofacountry'sinfrastructure.Oneofthetypesofbridgesthatarewidelyusedthesedaysisthecable-stayedbridge,whichincludesamainspansupportedbystaycablesthatareattachedtotowers.However,ifthebridgeislocatedinaseismicallyactiveregion,itcanexperienceearthquake-inducedvibrationsthatcanaffectitsstructure. Thispaperaimstostudytheseismicresponseofacable-stayedbridgewithalargespansubjectedtoblast-inducedgroundmotions.Thestudywillbecarriedoutusingnumericalsimulationsthattakeintoaccountthedynamiccharacteristicsofthebridgeandthesoil-structureinteractioneffects. Theresultsofthisstudywillprovideinsightsintothebehaviorofcable-stayedbridgesunderblast-inducedgroundmotions,whichcouldhelpindesigningsuchstructurestoresistthesetypesofloads. Introduction Cable-stayedbridgesareaneffectivesolutionforspanninglargedistanceswithminimalstructuralweight.Thesestructuresconsistofamainspansupportedbystaycables,whichareattachedtotowers.Themainspanisusuallymadeofsteelorconcrete,whilethetowersandcablesaremadeofsteel.Cable-stayedbridgesarewidelyusedinmanyapplicationssuchashighways,railways,andpedestrianwalkways. However,cable-stayedbridgesarevulnerabletodynamicloads,suchasearthquakes,wind,andhuman-inducedvibrations.Oneofthemostchallengingdynamicloadsisearthquake-inducedvibrationsthatcancauseseveredamagetothebridgestructure.Earthquakemotioncanexcitevariousmodesofvibrationofthebridge,includingvertical,horizontal,andtorsionalmodes. Moreover,seismicwavescanalsogenerategroundmotionsthatcaninteractwiththesoil-structuresystem,leadingtosignificantamplificationorattenuationofthevibrationresponse. Inadditiontoearthquakes,cable-stayedbridgescanalsobeexposedtoblast-inducedgroundmotions,whichcouldoccurduetoaccidentsorterroristattacks.Blast-inducedgroundmotionscancausesimilareffectstoearthquakes,includinggroundmotionamplificationandsoil-structureinteractioneffects. Theobjectiveofthisstudyistoinvestigatetheseismicresponseofalarge-spancable-stayedbridgesubjectedtoblast-induced