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时间:2020-04-05
《斜拉桥索塔低回缩环向预应力锚固结构研究.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2012年第42卷第5期(总第215期)BridgeConstruction,Vo1.42,No.5,2012(TotallyNo.215)2l文章编号:1003~4722(2012)05—0021—05斜拉桥索塔低回缩环向预应力锚固结构研究曾永平,陈克坚,袁明,陈思孝,戴胜勇(中铁二院工程集团有限责任公司,四川成都610031)摘要:为设计一种新型的斜拉桥索塔锚固区预应力锚固结构,避免采用常用环向预应力索塔锚固结构带来的局限性,在调查分析了已有研究成果的基础上,从锚固区环向预应力损失的原理出发研究减少预应力损失的措施,提出了新型的低回缩环
2、向预应力锚固结构方案。以韩家沱长江特大桥索塔锚固区为研究对象,设计了索塔低回缩环向预应力锚固结构和U形环向预应力锚固结构,并对这2种方案的有效预应力及预应力作用下索塔锚固区混凝土应力进行计算,结果表明,采用低回缩环向预应力锚固结构可显著减少预应力损失且有效应力沿程分布均匀,索塔锚固区的混凝土应力分布也更加均匀。关键词:斜拉桥;索塔锚固结构;环向预应力;低回缩预应力锚具;预应力损失中图分类号:U448.27文献标志码:AStudyofLowRetractingRingPrestressedAnchorageStructureinPylonofCabl
3、e。-StayedBridgeZENGlong—ping,CHENKe-jJan,YUANMing,CHENSi—xiao,DAISheng—yong(ChinaRailwayEryuanEngineeringGroupCo.,Ltd.,Chengdu610031,China)Abstract:Todesignanewtypeoftheprestressedanchoragestructureforanchoragezoneinpylonofcable—stayedbridgeandtoavoidthelimitationscausedbyutil
4、izationofthecommonringprestressedanchoragestructureinthepylonofthebridge,therelatedmeasuresforreducingpre—stresslosswerestudiedandanewtypeofthelowretractingringprestressedanchoragestructurewasdevelopedonthebasisofinvestigationandanalysisoftheexistingresearchachievementsandinac
5、cordancewiththeprincipleofringprestresslossoftheanchoragezone.Bytakingthean—choragezoneinthepylonofHanjiatuoChnagjiangRiverBridgeastheresearchobject,thelowre—tractingringprestressedandtheU—shaperingprestressedanchoragestructuresweredesignedandtheeffectiveprestressofthetwotypes
6、ofthestructuresandthestressofconcreteoftheanchor—agezoneinthepylonundertheactionofprestressingwerecalculated.Theresultsofthecalcula—tiondemonstratethattheutilizationofthelowretractingringprestressedanchoragestructurecansignificantlyreducetheprestressloss,thedistributionoftheef
7、fectivestressonpathisuniformandthedistributionofthestressofconcreteoftheanchoragezoneinthepylonisstillmoreuni~form.Keywords:cable—stayedbridge;anchoragestructureinpylon;ringprestress;lowretractingprestressinganchor;pretresslOSS收稿日期:2O12一O5—14基金项目:铁道部重大科研课题《大跨度桥梁建造关键技术研究一大跨度铁路斜
8、拉桥建造关键技术研究》(2009G004一D)KeyScientificResearchProjectoftheMinis
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