摘要
Thepropagationofstresswavesinalarge-diameterpipepileforlowstraindynamictestingcannotbeexplainedproperlybytraditional1Dwavetheories.Anewcomputationalmodelisestablishedtoobtainawaveequationthatcandescribethedynamicresponseofalarge-diameterthin-walledpipepiletoatransientpointloadduringalowstrainintegritytest.Ananalyticalsolutioninthetimedomainisdeducedusingtheseparationofvariablesandvariationofconstantmethods.Thevalidityofthisnewsolutionisverifiedbyanexistinganalyticalsolutionunderfreeboundaryconditions.Theresultsofthistimedomainsolutionarealsocomparedwiththeresultsofafrequencydomainsolutionandfieldtestdata.Thecomparisonsindicatethatthenewsolutionagreeswellwiththeresultsofprevioussolutions.Parametricstudiesusingthenewsolutionwithreferencetoacasestudyarealsocarriedout.Theresultsshowthatthemodenumberaffectstheaccuracyofthedynamicresponse.Amodenumbergreaterthan10isrequiredtoenablethecalculateddynamicresponsestobeindependentofthemodenumber.Thedynamicresponseisalsogreatlyaffectedbysoilproperties.Thelargerthesideresistance,thesmallerthedisplacementresponseandthesmallerthereflectedvelocitywavecrest.Thedisplacementincreasesasthestresswavespropagatealongthepilewhenthepileshaftisfree.Theincidentwavesofdisplacementandvelocityresponsesofthepilearenotthesameamongdifferentpointsinthecircumferentialdirectiononthepiletop.However,thearrivaltimeandpeakvalueofthepiletipreflectedwavesarealmostthesameamongdifferentpointsonthepiletop.
出版日期
2015年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
