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ID:32092328
大小:1.91 MB
页数:70页
时间:2019-01-31
《大跨斜拉桥合理成桥状态确定及施工控制的的研究》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、摘要大跨度斜拉桥是由主梁、塔柱、拉索三种基本构件组成的高次超静定柔性结构体系。其成桥内力状态具有多样性,而成桥内力分布的好坏是衡量设计优劣的重要指标之一。一旦斜拉桥结构体系确定,总能找出一组斜拉索索力,使结构体系在确定荷载作用下,某种反应成桥受力状态的目标达到最优。大跨度斜拉桥多采用悬臂施工法,随着施工阶段斜拉桥结构体系和荷载状态的不断变化,结构的变形和内力也随之不断变化。为方便施工和保证结构的安全性,减少施工阶段斜拉索张拉次数,确保施工过程中结构不出现超应力现象,控制合理的施工状态成为斜拉桥研究的重要内容。主要研
2、究内容:(1)斜拉桥合理成桥状态确定方法及在工程中的应用;C2)调整斜拉索索力对施工过程主梁受力状态的影响分析;(3)施加配重对施工过程主梁受力状态的影响分析。(4)旋加配重方案与调索方案的比较分析。主要结论:(1)通过优化方法可以找到一组最优索力满足合理成桥状态要求;(2)调整斜拉索索力及施加配重均可有效改善施工过程主梁受力状态;(3)施加配重方案节省造价、操作方便。关键词斜拉桥;成桥状态;施工状态;调索;配重ABSTll^CTABSTRACTThelong-spancable-stayedbridge,akin
3、dofindeterminateflexibleslructurewithmanyredundantdegrees,consistsofthreebasicmembers:girder,towerandcables.Its’interforcesarenotuniqueunderfinishedstate.Weathertheinterforcesarereasonabledecidesthelevelofthisdesign.Ifthestructureandloadingarefixed,wealwaysCan
4、makeoutasetofcableforcestomakesomeaimsthatresponsetheforcestateoffinishedstructureoptimumunderfixedstructureandloadings.Mostcable-stayedbridgesareconstructedbywayofcantilever.Duringtheconstruction,theshapeandinnerforcesofstructurechangewiththetransformationoft
5、hestructureandloadingsaccordingly.TobeSUrOoftheconstructionsafety,tobeconv∞ientfortheconstruction,tominimizethetimeofadjustingcabletension,itisveryimportantforthedesignerstomakesurethattheworkingprocedureispractical(theshapeandinnerstressofthestructureisnottoo
6、hi【ghtothecriterion).Maincontentsofstudy:(1)HowtomakeoutthereasonablestateoffinishedbridgeandhowtoUSeinconstruction;(2)111eeffectofadjustingthecablestensiontothegirderforcesduringconstruction;(3)Theeffectofapplyingtemporarydead-loadingtothegirderforcesduringco
7、nstruction.(4)Comparewiththetworesultaboveandstudythem.Mainconclusions:(1)Asetofcable-forcescanbefoundtomeettheneedoffinishedconstructionstate.(2)Cable-forcesadjustingandapplyingtemporarydead—loadingCanimprovethe西rderforceseffectivelyduringconstruction.(3)Appl
8、yingdead-loadingismoreeconomicalandconvenientforconstruction.KEYWORDScable-stayedbridge;thestateoffinishedconstruction;thestateofconstruction:adjustingcabletension;temporarydead-lo
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