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1、維普資訊http://www.cqvip.com第3卷第5期鐵道科學(xué)與工程學(xué)報(bào)Vo1.3NO.52006年l0月JOURNALOFRAILWAYSCIENCEANDENGINEERINGOct20()6懸臂澆注斜交連續(xù)箱梁橋的線形監(jiān)控伍亮。余志武(中南大學(xué)土木建筑學(xué)院,湖南長沙410075)摘要:針對施工過程中,由-I-~.~1量誤差、施工誤差、設(shè)計(jì)參數(shù)誤差以及模型的失真,橋梁施工的實(shí)際線形-b施工理想線形之間總是存在偏差.以及斜交箱梁由于處于彎剪扭復(fù)雜的空問受力狀態(tài),無論是理論計(jì)算還是現(xiàn)場線形監(jiān)控,相對于正交箱梁都復(fù)雜得多等問題,以某三跨斜交連續(xù)箱粱橋?yàn)楣こ瘫程枺岢鲈擃愋蜆蛄壕€形監(jiān)控的
2、目的、技術(shù)和方法,以及線形監(jiān)控關(guān)鍵點(diǎn)立模標(biāo)高的影響因素和計(jì)算公式,介紹了計(jì)算斜交橋梁的計(jì)算方法,并討論了斜交橋梁懸臂施工時(shí)箱梁撓度的變化規(guī)律,以及斜交、溫度場對線形的影響與需要注意的問題。研究結(jié)果表明,所提出的技術(shù)和方法,可為同類型橋梁的施工監(jiān)控提供參考關(guān)鍵詞:施工監(jiān)控;預(yù)拱度;溫度場;斜交;扭轉(zhuǎn)中圖分類號:U445文獻(xiàn)標(biāo)識碼:A文章編號:1672—7029(20o6)o5—003l一05ThelinearismonitoringunderskewcontinuousboxgirderbridgescastwithbalancedcantilevermethodWULiang.YUZhi—
3、wu(SchoolofCivilandArchitectur,'dEngineering,CentralSouthUniversity,Changsha410075,China)Abstract:Duringtheprocessofconstruction,actuallinearisofbridgesisalwaysdifferentfromideallinearisofbridges,duetomeasureelTors,constructionerrors,designerrorsandinexactitudemodelandSOon.Howtorecognizeandamendth
4、emisthekeypointofsuccessfulconstructionmonitoring.Skewboxgirderisunderacomplexstrainedcondition,SOitismuchmorecomplexthantheorthogonalboxgirderincalculatingandlinearismonitoring.Basedonsome3一spanskewcontinuousboxgirderbridge,theintention,content,methodaboutlinearismonitoringofthiskindofbridgeswere
5、studied,andinfluencingfactorsandcalculatingmethodofformplacingelevationwereresearchedatthekeypointinlinearismonitoring.Andthewayscalculatingskewbridgeswereintroduced,thedisciplinarianofsaggingschangeofboxgirderwerediscussedwhenitWaseastwithBCM,andtheinfluenceofskewsupporting,aswellastem—peratumfie
6、ld.onlinearisandsomequestionswereputforward.Theresultsshowthatthistheoryandmethodhaveref-ereneeaboutconstructionmonitoringtothesamekindofbridgesconstruction.Keywords:constructionmonitoring;camber;temperaturefield;skew;torsion橋梁在施工過程中,梁體的撓度變形是顯著且真分析,確定每個懸臂澆注階段立模標(biāo)高,并在施復(fù)雜的,立模時(shí)必然需要設(shè)置一反向的預(yù)拱度以抵工過程中根據(jù)施工監(jiān)
7、測的成果對誤差進(jìn)行分析、預(yù)消撓度的影響,橋梁成橋后的線形才能達(dá)到理想的測和對下一立模標(biāo)高進(jìn)行調(diào)整,以確保橋梁能夠精設(shè)計(jì)狀態(tài)。橋梁線形監(jiān)控的目的,就是根據(jù)施工監(jiān)確地合攏,以及橋梁在成橋后的線形符合設(shè)計(jì)測所得的結(jié)構(gòu)數(shù)據(jù)參數(shù)真實(shí)值進(jìn)行施工階段的仿要求。收稿日期:20O6—04—29基金項(xiàng)目:湖南省自然科學(xué)基金資助項(xiàng)目(03089)作者簡介:伍亮(1982一),男,湖南新化人,碩士研究生,從事結(jié)構(gòu)工程研究維普資訊http://w