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1、橋梁建設(shè)2012年第42卷第5期(總第215期)44BridgeConstruction，Vo1．42，No．5，2012(TotallyNo．215)文章編號：1003—4722(2012)05—0044—07大跨度混合梁斜拉橋彈塑性極限承載力分析徐金勇，顏全勝。(1．惠州市道路橋梁勘察設(shè)計院，廣東惠州516002；2．華南理工大學(xué)土木與交通學(xué)院，廣東廣州510641)摘要：為研究混合梁斜拉橋的彈塑性極限承載力，基于連續(xù)體三維虛功增量方程，建立空間薄壁梁單元的U．L．列式增量平衡方程，采用分段分塊變剛度法計算
2、單元的彈塑性剛度矩陣，并編制相應(yīng)的斜拉橋彈塑性極限承載力空間分析程序ULCA。采用ULCA對某主跨480m的雙塔三跨空間雙索面混合梁斜拉橋成橋進行彈塑性極限承載力分析，分析結(jié)果表明：該橋的荷載安全系數(shù)志一3．1465，因混凝土主梁受壓區(qū)破壞而達到極限狀態(tài)；材料非線性對邊跨位移、索力及橋塔位移的影響遠大于對中跨的影響；極限荷栽作用下，材料非線性對主梁和橋塔的軸力基本無影響，但彎矩重分布比較明顯。關(guān)鍵詞：斜拉橋；混合梁；彈塑性分析；極限承載力；有限元法中圖分類號：U448．27文獻標(biāo)志碼：AAnalysisofEl
3、asto。-PlasticUltimateLoadBearingCapacityofLongSpanHybridGirderCable-StayedBridgeXUJin-yong，YANQuan—sheng(1．HuizhouCityRoadandBridgeSurveyandDesignInstitute，Huizhou516002，China；2．SchoolofCivilEngineeringandTransportation，SouthChinaUniversityofTechnology，Guang
4、zhou510641，China)Abstract：Tostudytheelasto—plasticultimateloadbearingcapacityoflongspanhybridgirdercable—stayedbridge，theincrementalequilibriumequationofU．L．formulationforaspacialthin-walledbeamelementwasdevelopedonthebasisoftheincrementalvirtualworkequation
5、of3-di—mensionalcontinuum．Theelasto—plasticstiffnessmatrixofthebeamelementwascalculatedbythesegmentandblockvariablestiffnessmethodandthecorrespondingspacialanalysisprogramULCAfortheelasto‘—plasticultimateloadbearingcapacityofthecable——stayedbridgewascorn—pli
6、ed．TheULCAwasthenusedtoanalyzetheelasto—plasticultimateloadbearingcapacityofacompletedthree—spanhybridgirdercable—stayedbridgewithdoublepylons，doublespacialcableplanesandwithamainspan480m．TheresultsoftheanalysisdemonstratethattheloadsafetyfactorofthebridgeiS
7、k一3．1465andthebridgereachestheultimatestateonaccountoffailureofthecompressionareasofmaingirderofthebridge．Theinfluencesofmaterialnonlinearityonthedisplacementandcableforcesofthesidespanandonthedisplacementofpylonsarefargreaterthanthoseonthecentra1span．Undert
8、heactionoftheultimate1oad。themateriaInonlinearitybasicallyhasnoinfluenceontheaxialforcesofthemaingirderandpylons，howevertheredistri—butionofbendingmomentinsuchcaseiSquitenotable．Keywords：cable—s
