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页数:8页
时间:2019-05-13
《湘西矮寨大桥设计创新技术》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、54桥梁建设2011年第6期文章编号:1003—4722(2011)06—0054—08湘西矮寨大桥设计创新技术胡建韭,,崔剑峰(1.湖南大学土木工程学院,湖南长沙410082;2.湖南省交通规划勘察设计院,湖南长沙410008)摘要:湘西矮寨大桥为塔梁分离式单跨钢桁梁悬索桥,主缆跨径布置为242m+1176m+116m,加劲梁长度为1000.5m。该桥设计时结合特殊的地形、地质条件,首次提出了塔梁分离式悬索桥新结构,实现了结构与环境的完美融合。采用在主缆无吊索区增设竖向岩锚吊索的方式解决了无索区过长造成的结构问题。采用高性能复
2、合材料CFRP作为锚杆、超高性能混凝土RPC作为锚杆两端的粘结介质,形成一种高效、耐久的新型岩锚体系。针对山区大跨度悬索桥加劲梁运输与架设的难题,提出了柔性轨索滑移法架设加劲梁的新工艺。通过三维数值模拟分析,分析了施工、运营过程中结构体系与山体的稳定性问题,形成了结构与山体系统稳定新技术。关键词:悬索桥;塔梁分离;高性能复合材料;地锚;轨索滑移法中图分类号:U448.25文献标志码:AInnovativeTechniquesofDesignofAizhaiBridgeinWestHunanHUJian-hua,-。Cdian—f
3、eng(1.CollegeofCivilEngineering,HunanUniversity,Changsha410082,China;2.HunanProvincialTransportPlanning,SurveyandDesignInstitute,Changsha410008,China)Abstract:TheAizhaiBridgeintheWestHunanisasinglespansteeltrussgirdersuspensionbridgewithseparatedtowersandgirder.Thema
4、incablespanarrangementofthebridgeis242m+1176m+116mandthelengthofthestiffeninggirderis1000.5m.Inthedesignofthebridge,inviewofthespecialtopographicandgeologicconditionsatthebridgesite,anewstruc—tureofsuspensionbridgewithseparatedtowersandgirderwasbroughtforwardforthefi
5、rsttimeandtheperfectmergenceofthestructureintotheenvironmentwasachieved.Intheareasofthemaincableswithoutsuspenders,thestructuralproblemcausedbythelongmaincableswithoutsuspenderswasresolvedbywayofaddingtheverticalrockanchoredsuspenders.Theutilizationofthehighperforman
6、cecompositematerial,thecarbonfiberreinforcedpolymer(CFRP),astheanchorrodsandtheutilizationofthehighperformanceconcrete,thereactivepowderconcrete(RPC),asthebindingmediumatbothendsoftheanchorrodsresultedinanewtypeofrockan—chorsystemofhighefficiencyanddurability.Inconsi
7、derationofthedifficultiesoftransportationanderectionofthestiffeninggirderofthelongspansuspensionbridgeinthemountainousregion,thenewconstructiontechnologyforerectionofthestiffeninggirderbytheflexiblerailcablelaunchingmethodwasproposed.Bymeansofthethree—dimensionalnume
8、ricalsimulation,thestabilityofthestructuralsystemandmountainmassifintheprocessofthebridgeconstructionandoperationwasanalyzedandanew
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