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1、橋梁建設(shè)2012年第42卷第3期(總第213期)BridgeConstruction,Vo1.42,No.3,2012(TotallyNo.213)19文章編號:1003—4722(2012)03—0019—05大跨度連續(xù)剛構(gòu)柔性拱組合結(jié)構(gòu)受力效應(yīng)分析諶啟發(fā)(中鐵第四勘察設(shè)計院集團有限公司,湖北武漢430063)摘要:為研究大跨度連續(xù)剛構(gòu)柔性拱組合結(jié)構(gòu)受力效應(yīng),以宜萬鐵路宜昌長江大橋為背景,在總結(jié)該類結(jié)構(gòu)體系特點的基礎(chǔ)上,采用橋梁博士分析軟件建立全橋平面有限元模型,對全橋橋面施加豎向均布荷載(二期恒
2、載),分析拱梁內(nèi)力、豎向荷載及跨中截面彎矩的分配;將該橋與孔跨組成及截面尺寸完全相同的連續(xù)剛構(gòu)橋在恒、活載作用下的結(jié)構(gòu)內(nèi)力進行對比,分析組合結(jié)構(gòu)的拱梁組合效應(yīng)。分析結(jié)果表明:在豎向均布荷載作用下,連續(xù)剛構(gòu)柔性拱組合結(jié)構(gòu)跨中范圍吊桿軸力增加較大;結(jié)構(gòu)跨中截面總彎矩絕大部分已轉(zhuǎn)化為拱肋壓力與主梁拉力;與連續(xù)剛構(gòu)相比,活載作用下,連續(xù)剛構(gòu)柔性拱組合結(jié)構(gòu)的主梁彎矩顯著減小,結(jié)構(gòu)剛度提高較大,柔性拱作用明顯。關(guān)鍵詞:鐵路橋;組合結(jié)構(gòu);連續(xù)剛構(gòu);柔性拱;受力分配;結(jié)構(gòu)效應(yīng)中圖分類號:U448.13文獻標(biāo)志碼:A
3、AnalysisofForceEffectofLongSpanHybridStructureofContinuousRigid—FrameandFlexibleArchCHENQi—fa(ChinaRailwaySiyuanSurveyandDesignGroupCo.,Ltd.,Wuhan430063,China)Abstract:Tostudytheforceeffectofthelongspanhybridstructureofcontinuousrigid—frameandflexiblea
4、rch,theYichangChangjiangRiverBridgeonYichang—WanzhouRailwaywascitedasexample.Onthebasisofsummarizationofthecharacteristicsofsuchtypeofthestruc—turesystem,theanalysissoftwareBridgeDoctorwasusedtoestablishtheplanarfiniteelementmodelforthewholebridgeofthe
5、bridge,theverticaluniformload(thesecondphasedeadload)wasappliedtothedeckofthewholebridgeandthedistributionofinternalforces,verticalloadandmidspansectionbendingmomentofthearchandgirderofthebridgewasanalyzed.Thestructuralinternalforcesofthebridgeunderthe
6、actionofstaticanddynamicloadswerecomparedtothoseofacontinuousrigid—-framebridgehavingcompletelythesamespancompositionsandsec—tionaldimensionsandtheeffectofthehybridstructureofthearchandgirderwasanalyzed.Theresultsoftheanalysisdemonstratethatundertheact
7、ionoftheverticaluniformload,theincreaseofthehangeraxialforcesintherangeofthemidspanofthehybridstructureofthecontinuousrigid~frameandflexiblearchisgreat,mostofthetotalbendingmomentofthemidspansectionhasbeentransferredtothecompressionofthearchribsandtoth
8、etensileforceofthemaingird~er.Incomparisontothecontinuousrigid—framebridge,thebendingmomentofthemaingirderofthehybridstructureundertheactionofliveloadisconsiderablyreduced,thestructuralrigidityisgreatlyincreasedandthefunctionoftheflexib