斜拉-悬吊协作体系桥地震反应分析.pdf

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1、桥梁建设2014年第44卷第6期(总第229期)88BridgeConstruction，Vo1．44，No．6，2014(TotallyNo．229)文章编号：1003—4722(2014)06—0088—06斜拉一悬吊协作体系桥地震反应分析张新军，虞周均(浙江工业大学建筑工程学院，浙江杭州310032)摘要：为研究斜拉一悬吊协作体系桥的抗震性能，以一座主跨1400m的斜拉一悬吊协作体系桥方案为背景进行分析。采用MIDASCivi1建立桥梁三维有限元模型，采用地震反应谱和时程分析方法进行水平和竖向地震作用下结构的地震反应分析以

2、及结构非线性对地震反应的影响分析，并通过与相同主跨悬索桥和斜拉桥方案地震反应的对比，探讨斜拉一悬吊协作体系桥在超大跨度桥梁中的适用性。结果表明：在水平地震作用下，斜拉一悬吊协作体系桥塔、梁结合处的主梁和塔柱以及塔底截面产生最大内力，应重视这些关键截面的抗震设计；斜拉一悬吊协作体系桥的抗震性能介于斜拉桥与悬索桥之间，更偏向于悬索桥，比斜拉桥优越，适用于主跨超千米的大跨度桥梁。关键词：斜拉一悬吊协作体系桥；地震反应；反应谱分析；结构非线性；时程分析；有限元法中图分类号：U448．29；U442．55文献标志码：AAnalysisof

3、SeismicResponsesofCombinedCable—StayedandSuspensionBridgeZHANGXin-jlln。YUZhou-jll，l(CollegeofCivilEngineeringandArchitecture，ZhejiangUniversityofTechnology，Hangzhou310032，China)Abstract：Tostudytheseismicperformanceofthecombinedcable—stayedandsuspensionbridge，apropose

4、dbridgeofthesamekindwithamainspanof1400mwastakenasanexampleandwasanalyzed．Thethree—dimensiona1finiteelementmodelforthebridgewassetupbytheMIDASCivil，thestructuralseismicresponsesofthebridgeunderthehorizontalandverticalseis—micactionandtheinfluenceofthestructuralnonlin

5、earityontheseismicresponseswereanalyzedbytheseismicresponsespectrumandthetime—historyanalysismethods．Throughcomparisonoftheseismicresponsesofthebridgetothoseofasuspensionbridgeandacable——stayedbridgehay—ingthesamemainspans，theadaptabilitythatthebridgewastobeusedasthe

6、superlongspanbridgewasstudied．Theresultsofthestudyshowthatunderthehorizontalseismicaction，thegreatestinternalforcesmayoccurinthemaingirderattheconnectionsofthetowersandgirderandinthecrosssectionsofthetowercolumnsandtowerfootingsofthebridgeandtherefore，specialattentio

7、nshouldbepaidtotheseismicdesignofthesecriticallocationsandcrosssections．Theseismicperformanceofthebridgeisbetweenthatofthecabled—stayedbridgeandsuspensionbridge，isclosertothatofthesuspensionbridge，issuperiortothatofthecable—stayedbridgeandisapplicabletothelongspanbri

8、dgehavingspanlengthover1000m．Keywords：combinedcable—stayedandsuspensionbridge；seismicresponse；responsespec—trumanalysis；structuraln