大跨度连续刚架拱桥的地震响应研究

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1、V乱扣qBhdA--rNN句AUW3第24卷第3期深圳大学学报理工版qB2007年7月JOURNALOFSHENZHENUNIVERSITYSCIENCEANDENGINEERING叭文章编号:1000-2618(2007)03-0228-06Seismicresponseoflongspancontinuousrigid-framearchbridgeLIUAi-rong,YUQi-cai,andZHANGJun-pingCollegeofCivilEngineeringGuangzhouUniversityGuangzhou510006P.R.ChinaAbs

2、tract:Thispaperinvestigatesthespatialvariabilityeffectsofgroundmotionontheseismicresponseoflong-spancontinuousrigid-framearchbridge.TheanalysesareperformedontheXinguangbridgeinGuangzhou,whichistheworldwidefirst3-spancontinuousrigid-frameandsteel-trussarchbridgewithreinforcedconcreteV-

3、shapedrigidframe.Itsspansofthemainbridgeareaslongas(177+428+177)m.Thespatialvariabilityofgroundmotionsbetweenpivotsofthebridgeistakenintoaccountwithmulti-supportexcitationandtravelingwaveeffectbyexcitingthebridgeinbothtransverseandlongitudinaldirectionsofthebridge.Newstudyshowsthechar

4、acteristicsofseismicresponseofthecriticalbridgemembersarevariedwithdifferentseismicexcitations.ThespatiallyvaryinggroundmotionhasaconsiderableinfluenceontheseismicresponsesoftheribsofthemainarchandV-shapedrigidframe,whereastheinfluenceonthesidearchribsisinsignificantlypredominant.Asth

5、eshearwavevelocityincreasesthepeaklongitudinaldisplacementofthecrownofthemainarchrelativetothearchspringingdecreases,while,theeffectofshearwavevelocityonthelongitudinaldisplacementoftheribsofthesidearchcanbeneglected.Keywords:archbridge;continuousrigid-framearchbridge;seismicresponse;

6、spatiallyvaryinggroundmotion;multi-supportexcitation;travelingwaveeffect;finiteelementmethodCLCNumber:U443.15;U442.55Documentcode:AIncurrentseismicdesigncode,itisassumedthatallpivotsthewave.Hencethemovementofeachpointonthegroundisofabridgestructurehavethesametypeofseismicgroundwaveusu

7、allydifferent.Ifthepropagationofthesameseismicwavea•effect,whichindicatesthatthepropagationvelocityofaseismiclongthelongitudeofthebridgehashystereticphenomenon,waveisinfiniteandallpivotsofthestructuresharethesynchro•i.e.,theinputofpivotseismicwavehasdifferentphaseangle,nousseismicexci

8、tatio