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时间:2020-03-25
《斜拉桥异型拱塔施工临时横撑方案比选.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2017年第47卷第4期(总第245期)BridgeConstruction,Vol.47,No.4,2017(TotallyNo.245)113文章编号:1003-4722(2017)04-0113-06斜拉桥异型拱塔施工临时横撑方案比选112卫军,曾志豪,李定有(1.中南大学土木工程学院,湖南长沙410075;2.中铁四局集团第五工程有限公司,江西九江332000)摘要:南宁青山大桥主桥为主跨430m的双塔混合梁斜拉桥,桥塔采用钢筋混凝土异型拱结构,塔柱采用全自动液压爬模施工,施工中沿塔柱高度方向布置了5道临时横撑。为有效控制施工过程中
2、桥塔的变形和应力,提出4种(3种水平横撑和1种“横撑+斜撑”)临时横撑方案,采用ANSYS软件建立桥塔的空间有限元模型,模拟桥塔施工全过程,分析临时横撑和塔柱的位移和应力。结果表明:“横撑+斜撑”方案的临时横撑横向和竖向位移最小,受到的应力水平最低,最能有效控制桥塔的应力和变形。因此,采用“横撑+斜撑”方案。分析该方案下横撑对桥塔的位移和空间受力影响可知:塔柱的压、拉应力分别控制在10.0MPa和0.7MPa内;桥塔横桥向最大位移为7.8mm,倾斜度约为1/17600,均满足施工要求。关键词:斜拉桥;异型桥塔;钢筋混凝土结构;临时横撑方案;有限元法
3、;方案比选中图分类号:U448.22;U443.38文献标志码:AComparisonandSelectionofSchemesofTemporaryCrossBracingsforConstructionofSpecial‐ShapedArchPylonsofaCable‐StayedBridge112WEIJun,ZENGZhihao,LIDingyou‐(1.SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China;2.TheFifthEngineeringCo.
4、,Ltd.,ChinaRailwaySijuCivilEngineeringGroup,Jiujiang332000,China)Abstract:ThemainbridgeoftheQingshanBridgeinNanningisadouble‐pylonhybridgirdercable‐stayedbridgewiththemainspanof430m.Thepylonsofthebridgearethereinforcedcon‐cretespecial‐shapedarchpylonsandthepyloncolumnswerecons
5、tructed,usingtheautomatichy‐draulicclimbformwork.Intheconstruction,5temporarycrossingbracingswerearrangedforapylonalongtheheightofthepyloncolumns.Toeffectivelycontrolthedeformationandstressesofthepylons,4schemesofthecrossingbracings(3typesofthehorizontalcrossingbracingsand1typ
6、eofthecrossbracings+diagonalbracings)wereproposed.ThesoftwareANSYSwasusedtoestablishthespatialfiniteelementmodelforthepylons,thewholeconstructionprocessesofthepylonsweresimulatedandthedisplacementandstressesofthecrossingbracingsandpyloncol‐umnswereanalyzed.Theresultsoftheanaly
7、sisdemonstratethatthetransverseandverticaldis‐placementoftheschemeofthecrossingbracings+diagonalbracingsistheleast,thestresslevelsarethelowestandwiththescheme,thestressesanddeformationofthepylonscanbecontrolledmosteffectively.Inthatcase,theschemeisselected.Fromtheanalysisofthe
8、influencesofthelowercrossbracingsintheschemeonthedisplacement
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