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时间:2019-05-13
《基于多点激励的刚构连续组合梁桥行波效应分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2012年第42卷第6期(总第217期)BridgeConstruction,Vo1.42,No.6,2012(TotallyNo.217)33文章编号:1003—4722(2012)06—0033—06基于多点激励的刚构一连续组合梁桥行波效应分析李小珍,雷虎军(西南交通大学土木工程学院,四川成都610031)摘要:为了探讨行波效应对刚构一连续组合梁桥结构不同部位响应极值的影响规律,以某48m+5×80m+48m刚构一连续组合梁桥为背景,建立刚性地基和弹性地基2种计算模型,采用大质量法(LMM)
2、求解了一系列相位差条件下结构的非线性地震响应。分析结果表明:对于主跨大于或等于8Om的刚构一连续组合梁桥,在抗震设计中必须考虑行波效应的影响,且应重点关注刚构墩的地震响应;在进行行波效应分析时必须根据基岩类型选择恰当的相位差输入,以此来获得结构真实的地震响应;在纵向行波作用下,结构的内力响应峰值和位移响应峰值均随相位差呈周期性变化,其变化周期与结构的特征周期相一致。关键词:刚构~连续梁桥;有限元法;多点激励;行波效应;相位差中图分类号:U448.216文献标志码:AAnalysisofTraveling
3、WaveEffectofHybridBridgeofRigid_·FrameandContinuousGirderBasedonMulti-SupportExcitationLIXiao—zhen,LEIHu—jun(SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Tostudythelawofinfluenceofthetravelingwaveeffectontheresponseli
4、mitingvaluesofdifferentpartsofthehybridbridgestructureofrigid—frameandcontinuousgirder,abridgeofthesamestructura1typewithspanarrangement48m+5×80m+48mwascitedasanexample.Twokindsofthecalculationmodelsfortherigidgroundbaseandelasticgroundbaseweresetupandth
5、enonlinearseismicresponsesofthestructureunderaseriesofphasedifferenceconditionsweresolvedandanalyzed,usingthelargemassmethod.Theresultsoftheanalysisshowthatforthehybridbridgestructureofrigid—frameandcontinuousgirderwiththemainspanbeinggreaterorequalto80m
6、,theinfluenceofthetravelingwaveeffectmustbeconsideredintheseismicdesignandtheparticularconcernshouldbegiventotheseismicresponsesoftherigidpiers.Intheanalysisofthetravelingwaveeffect,theappropriatephasedifferenceinputshouldbeselectedaccordingtothetypesoft
7、hebaserocksSOthatthetrueseismicresponsesofthestruc—turecanbeacquired.Undertheactionofthelongitudinaltravelingwaves,thepeakvaluesoftheinternalforceanddisplacementresponsesofthestructurepresenttheperiodicchangesalongwiththechangesofthephasedifferencesandth
8、eperiodsofthechangesareidenticalwiththecharac—teristicperiodsofthestructure.Keywords:rigid—frameandcontinuousgirderbridge;finiteelementmethod;multi—supportexcitation;travelingwaveeffect;phasedifference收稿日期:2012一O7一O2基金项目:国
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