資源描述:
《嘉紹大橋鋼箱梁懸臂拼裝截面變形分析》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、橋梁建設(shè)2014年第44卷第1期(總第224期)BridgeConstruction,Vo1.44,No.1,2014(TotallyNo.224)31文章編號:1003—4722(2014)01—0031—06嘉紹大橋鋼箱梁懸臂拼裝截面變形分析李忠三,雷俊卿,林道錦。(1.北京交通大學(xué)土木建筑工程學(xué)院,北京100044;2.中交公路規(guī)劃設(shè)計院有限公司,北京100088)摘要:鋼箱梁懸拼施工時在其梁段匹配端會產(chǎn)生變形差,若變形過大則影響梁段的順利匹配。為了解鋼箱梁懸臂拼裝施工時梁段匹配端的相對變形及其影響因素,以在建的嘉紹大橋?yàn)楣こ瘫尘埃捎糜邢拊治鲕浖?,建模分析梁段拼接截面?/p>
2、吊機(jī)作用、溫度梯度作用、橫隔板剛度及整體剛度變化影響下的相對變形,計算結(jié)果表明:梁端拼接口相對豎向變形主要是由吊機(jī)作用梁段變形產(chǎn)生的;正溫差比負(fù)溫差對拼接口相對變形的影響大;提高鋼箱梁橫隔板的剛度對拼接口變形的減小作用不大。關(guān)鍵詞:斜拉橋;嘉紹大橋;鋼箱梁;懸臂拼裝;匹配截面;變形分析;有限元法中圖分類號:U448.27;U445.1文獻(xiàn)標(biāo)志碼:AAnalysisofSectionDeformationofSteelBoxGirderofJiashaoBridgeDuringCantileverAssemblingLIZhong—san.LEIJun—qing.LINDao-ji
3、n。(1.SchoolofCivilEngineering,BeijingJiaotongUniversity,Beijing100044,China;2.CCCCHighwayConsultantsCo.,Ltd.,Beijing100088,China)Abstract:Thedeformationdifferencesmayemergeatthematchendsofthesteelboxgirderblocksduringcantileverassemblingofthegirderandintheeventthatthedeformationistoogreat。the
4、smoothmatchingoftheblockswillbehindered.Tounderstandtherelativedeforma—tionandtherelatedinfluentialfactorsofthematchendsduringthecantileverassembling,theJiashaoBridgebeingconstructedwascitedasexample,thefiniteelementanalysissoftwarewasusedtosetupthemodelandtoanalyzetherelativedeformationofthe
5、assembledsectionsofthegirderblocksofthebridgeundertheactionofcranesandtemperaturegradientsandalsoundertheinfluencesofchangesofthediaphragmrigidityofthesteelboxgirderandtheglobalrigidityofthestructure.Theresultsoftheanalysisshowthattherelativevertica1deformationoftheas—sembledjointsofthegirder
6、blockendsismainlycausedbythecraneloadsactingontheblocks,theinfluenceofthepositivetemperaturedifferenceontherelativedeformationoftheassembledjointsisgreaterthanthatofthenegativetemperaturedifferenceandtheincreaseofthediaphragmrigidityisnotmuchhelpfultothereductionofthedeformationoftheassembled
7、joints.Keywords:cable—stayedbridge;JiashaoBridge;steelboxgirder;cantileverassembling;matchsections;deformationanalysis;finiteelementmethod1前言開啟了以扁平流線型鋼箱梁為加勁梁的時代,自此20世紀(jì)6O年代,英國塞文(Serven)橋的建成之后,扁平鋼箱梁以其抗彎、抗扭慣性矩大,·以及較收稿日期:2O13一O5—29基金項(xiàng)目:教育部高等學(xué)校博士點(diǎn)