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ID:36540100
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时间:2019-05-11
《天津南仓道立交桥主桥斜拉索调索优化方案》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、36桥梁建设2010年第3期文章编号:1003—4722(2010)03—0036~04天津南仓道立交桥主桥斜拉索调索优化方案周恒武,熊守富(中铁六局集团有限公司,北京100036)摘要:天津南仓道立交桥主桥为双塔连体四索面预应力混凝土分幅斜拉桥。原设计采取压重方案辅助斜拉索多步一次张拉至设计值。由于压重方案实施困难,该工程采用多步一次张拉法和多步多次张拉法相结合的综合调索技术优化原设计调索方案。采用结构分析软件MIDASCivil分别模拟优化前后的调索过程,并对该桥的施工阶段、成桥状态进行结构分析。分析结果表明:优化前后边墩支反力、桥塔底部反力变化在5%以内,主梁应力结
2、果基本吻合,成桥恒载索力差在1.58以内;优化后桥梁各部分受力均满足规范要求。关键词:斜拉桥;斜拉索;索力调整;优化中图分类号:U448.27文献标志码:AOptimizationSchemeofStayCableAdjustmentforMainBridgeofNancangAvenueInterchangeinTianjinZHOUHeng—wu,XIONGShou—fu(ChinaRailwayTieliujuCivilEngineeringGroupCo.,Ltd.,Beijing100036,China)Abstract:ThemainbridgeofNanca
3、ngAvenueInterchangeinTianjinisaprestressedcon—cretecable—stayedbridgewithconjoinedtwinpylons,fourcableplanesandseparateddecks.Intheoriginaldesign,thestaycablesofthebridgewouldbetensionedtotheirdesignedvaluesinonetimeinmultiplestepsbytheaidofcounterweight,however,sinceitwasdifficulttoreali
4、zethecounterweight,theoriginaldesignedcableadjustmentschemewasoptimizedbythecompre—hensivetechniqueofcombiningthemethodsofone—timetensioninginmultiplestepsandthemul—tiple—timetensioninginmultiplesteps.ThestructuralanalysissoftwareMIDASCivi】wasusedtorespectivelysimulatethecableadjustmentpr
5、ocessbeforeandaftertheschemewasoptimizedandthestructuralanalysisofthebridgeatconstructionandcompletionstageswasmade.Theresultsoftheanalysisindicatedthatthevariationsofreactionforceofthesidepiersandpylonbasesbe—foreandaftertheschemewasoptimizedwereallwithin5,thestressofthemaingirderwasba-s
6、icallyagreeable,thedeadloadcableforcedifferencesofthecompletedbridgewerewithin1.58%andthemechanicalbehaviorofvariouspartsofthebridgeaftertheschemewasoptimizedcouldsatisfytherequirementsinthetechnicalspecification.Keywords:cable—stayedbridge;staycable;cableforceadjustment;optimization1引言法包
7、括多步一次张拉法和多步多次张拉法。多步一索力调整是使斜拉桥同时满足合理施工状态以次张拉法为仅在当前梁段施工中实施斜拉索分步张及合理成桥状态的主要措施。斜拉索张拉调整的方拉,在梁段施工的最后一个步骤将斜拉索张拉至设收稿日期:2010—04~06作者简介:周恒武(1965一),男,高级工程师,1988年毕业于石家庄铁道学院桥梁专业,工学学士(~sp7399@126.com)天津南仓道立交桥主桥斜拉索调索优化方案周恒武,熊守富37计值。该方法在结构合龙后不再对斜拉索进行张拉桥,主桥全长300m,跨径布置为150m+15oha_,采调
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