Page 164 - 《水资源与水工程学报》2022年第5期
P. 164
! 33 " ! 5 # & ' ( ) & * + , - Vol.33No.5
2022 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2022
DOI:10.11705/j.issn.1672-643X.2022.05.20
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HIJKL:TU991.39 MNOPQ:A MRSL:1672643X(2022)05016009
Responseoflongspanwaterconveyancecablestayed
pipelinebridgetowaterhammerimpact
1
1
ZHANGJiarui,SONGZhiqiang,LIUChen 2
(1.StateKeyLaboratoryofEcohydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an
710048,China;2.ChinaRailwayFirstSurveyandDesignInstituteGroupCo.,Ltd.,Xi’an710043,China)
Abstract:Thewaterhammereffectinthepipelineoflongspancablestayedpipelinebridgesoftenhasan
greatadverseinfluenceonthebridgestructuresafety.Thefiniteelementmodelofacablestayedpipeline
bridgewasestablishedtocomparativelyanalyzethedynamiccharacteristicsofwater-pipe-bridgestruc
ture ,andthepipe-bridgeresonancecheckwascarriedout.Thebasicequationofwaterhammeris
solvedbythecharacteristiclinemethod,thenthewaterhammerpressuregeneratedbydifferentvalve
closingtimeintheprocessofwaterconveyanceconditionconversionwascalculatedtoanalyzethedynam
icresponseofthemaincomponentsofthepipelinebridgeundertheimpactofwaterhammerandthe
effectsofdifferentloadingmodesofwaterhammerloadanddifferentvalveclosingtimeontheresponseof
thecomponentsofthepipelinebridge.Theresultsshowthatthenaturalvibrationfrequenciesofcable
stayedbridgeandwaterconveyancepipelinearequitedifferentfromeachotherwhetherthereisnowater
orfullofwaterinthepipeline ,sothepipe-bridgeresonancewillnotoccur.Thenonuniformloading
modesignificantlyincreasesthedynamicresponseofeachcomponentofthepipelinebridge ,andboththe
incrementofdisplacementandstressaremorethan50%,buttheywillnotcausetheinstabilityorfailure
ofthecomponents.Withtheincreaseofvalveclosingtime,theimpactofwaterhammerisweakened,
andthedynamicresponseofthemaincomponentsdecreases,ofwhichtheresponseoftheKtypesupport
rod ,beamandventralrodinthesteeltrussbeam assemblydecreasessignificantly,whilethatofthe
bridgetoweronlydecreasesslightly.
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