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时间:2019-05-13
《马鞍山长江大桥三塔悬索桥关键技术研究》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、马鞍山长江大桥三塔悬索桥关键技术研究杨光武,徐宏光,张强7文章编号:1003-4722(2010)05—0007—05马鞍山长江大桥三塔悬索桥关键技术研究杨光武,徐宏光,张(1.中铁大桥勘测设计院有限公司,湖北武汉430050;2.安徽省交通规划设计研究院,安徽合肥230088)摘要:马鞍山长江大桥主桥为2×1080m三塔两跨悬索桥。三塔悬索桥的结构行为与两塔悬索桥不同,为防止主缆在中塔鞍座内滑移,围绕减少q-塔两侧主缆缆力不平衡差值措施,对中塔塔、梁固结体系、半漂浮体系和全漂浮体系进行静力、动力和抗风性能分析,确定采用各项性能均较优的塔、梁固结体系。同时,对桥塔刚度和结构形式进行分
2、析和比选,确定中塔采用上塔柱为钢结构、下塔柱为混凝土结构的钢一混凝土叠合塔。钢塔柱与混凝土塔柱采用底座连接方式,连接采用11O束37415.24的可更换钢绞线索进行锚固。为减小塔、梁固结处的固端弯矩,降低桥塔下横梁的扭转内力,经比选,中塔处梁高采用5.0m;中塔下横梁梁高采用6.5m。关键词:马鞍山长江大桥;悬索桥;支承体系;桥塔;桥梁设计;方案;研究中图分类号:U448.25文献标志码:AStudyofKeyTechniquesforThree-TowerSuspensionBridgeofMaanshanChangjiangRiverBridgeYANGGuang—WU.XUHo
3、ng—guang.ZHANGQiang(1.ChinaRailwayMajorBridgeReconnaissance&DesignInstituteCo.,Ltd.,Wuhan430050,China;2.AnhuiProvincialTransportPlanning,DesignandResearchInstitute,Hefei230088,China)Abstract:ThemainbridgeofMaanshanChangJiangRiverBridgeisathree—towerandtwo—spansuspensionbridgewithspanarrangement
4、(2×1080)m.Sincethestructuralbehaviorofthethree—·towersuspensionbridgediffersfromthatofthetwo—towersuspensionbridgeandtopreventthemaincablesfromslippinginthesaddlesontheintermediatetower,thestatic,dynamicforcesandwindresistantperformanceofthetower—to—girderrigidfixitysystem,semi—floatingsysteman
5、dfullfloatingsystemareanalyzedinthelightofthemeasuresofminimizingtheunbalancedforcedifferentialvaluesofthemaincablesateithersideofthetowerandthetower—to—girderrigidfixitysystemthathasvariousgoodperformanceisdetermined.Moreover,therigidityandstruc—turaltypesofthetowerareanalyzedandcomparedandaty
6、peofthecompositetowermadeupofsteelstructureatitsupperpartandreinforcedconcretestructureatitslowerpartischosen.Thetwopartsofthestee1andconcretetowercolumnsareconnectedbywayofthebaseconnec·tioninwhich110replaceablesteelstrands,eachcomposedof37DOS.of415.24steelwires,areusedtoanchorthecolumns.Tored
7、ucethebendingmomentinthefixedendsatthetower-to—girderrigidfixitypartanddecreasethetorsionalinternalforceinthelowercrossbeamofthetower.itisfur—therdecidedthatthestiffeninggirderof5.0mdepthisusedattheintermediatetowerandthelowercros
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