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1、橋梁建設2012年第42卷第3期(總第213期)BridgeConstruction,Vo1.42,No.3,2012(TotallyNo.213)57文章編號:1003—4722(2012)03—0057—06-_.】同tj墩大跨連續(xù)剛構橋施工控制參數(shù)敏感性分析馬顯紅,余毅(1.貴州高速公路開發(fā)總公司,貴州貴陽550004;2.中鐵大橋局集團武漢橋科院有限公司,湖北武漢430034)摘要:為研究高墩大跨連續(xù)剛構橋施工控制參數(shù)的敏感性,以貴州烏江特大橋為例,采用MIDASCivil軟件建立該橋三維有限元模型,計算施工監(jiān)控過程中各主要參數(shù)的取值對結構線形和內力的影響。計算分析結果
2、表明,混凝土節(jié)段重量、收縮徐變、溫度荷載等參數(shù)對該橋施工控制精度有顯著影響,混凝土彈性模量參數(shù)的影響比較明顯,預應力參數(shù)敏感程度相對較低。在施工控制過程中,應及時收集節(jié)段混凝土容重、彈性模量等參數(shù),根據實際施工時間歷程考慮收縮徐變效應的影響,并對計算模型加以修正;在設置預拱度和監(jiān)測數(shù)據測量時,要充分考慮到溫度對橋梁的線形及應力的影響。關鍵詞:連續(xù)剛構橋;施工控制;參數(shù);敏感性分析;有限元法;容重;彈性模量中圖分類號:U448.23文獻標志碼:AAnalysisofParameterSensitivityofConstructionControlofHigh—RisePieran
3、dLongSpanContinuousRigid—FrameBridgeMAXian-hong,YUI1/(1.GuizhouExpresswayDevelopmentCorporation,Guiyang550004,China;2.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034,China)Abstract:Tostudytheparametersensitivityofconstructioncontrolofthehigh—risepierand
4、longspancontinuousrigid—framebridge.aWujiangRiverBridgeinGuizhouwascitedasanex—ample,thesoftwareMIDASCivilwasusedtosetupthethree—dimensionalfiniteelementmodelforthewholebridgeofthebridgeandtheinfluencesoftheselectedvaluesofallprincipalparame—tersintheprocessoftheconstructioncontrolonthegeome
5、tricshapeandinternalforcesofthestructurewerecalculatedandanalyzed.Theresultsofthecalculationandanalysisshowthattheparametersliketheweight,shrinkage,creepandtemperatureloadoftheconcretesegmentshavesignificantinfluenceontheaccuracyoftheconstructioncontrol,theinfluenceoftheparameteroftheconcret
6、eelasticmodulusisobviousandthedegreeofparametersensitivityoftheprestressingisrelativelylow.Intheprocessoftheconstructioncontrol,theparametersoftheunitweightandelasticmodulusoftheconcreteshouldbetimelycollectedandthemodelshouldbecorresponding—lyupdatedinaccordancewiththeconstructiontimehistor
7、yandinconsiderationoftheinfluenceoftheshrinkageandcreep.Whentheprecamberissetandthemonitoringdataaremeasured,theinfluenceoftemperaturesonthegeometricshapeandstressofthebridgeshouldbefullytakenin—toaccount.Keywords:continuousrigid—framebridge;constr