世界桥梁
世界橋樑
세계교량
World Bridges
2015年
6期
73-78
,共6页
斜拉桥%联体分幅%不同步施工%支撑刚度%斜拉索垂度%线形%索力%有限元法%施工控制
斜拉橋%聯體分幅%不同步施工%支撐剛度%斜拉索垂度%線形%索力%有限元法%施工控製
사랍교%련체분폭%불동보시공%지탱강도%사랍색수도%선형%색력%유한원법%시공공제
cable-stayed bridge%combined dual separated decks%unparallel construction%sup-porting stiffness%verticality of stay cables%geometry%stay cable force%finite element method%construction control
为了解双塔联体分幅斜拉桥施工控制参数对结构的影响，结合滨海新城曹娥江大桥主桥（主跨300 m的四索面双塔联体分幅斜拉桥）工程，采用有限元法分析了考虑两幅桥不同步施工、边跨现浇段支撑刚度以及施工过程斜拉索垂度等参数下结构的内力和线形。结果表明：两幅桥彼此独立时，左右幅不同步施工对结构内力和线形基本无影响；两幅桥不同步施工对塔顶纵向位移、中跨主梁竖向位移以及边跨索力有一定影响，主梁边、中跨合龙误差分别可达7 mm、10 mm ；边跨现浇段支撑刚度对施工过程以及成桥状态的内力和线形均有明显影响；长悬臂施工状态，主梁混凝土浇筑一半时，斜拉索垂度对结构内力和线形的影响显著。
為瞭解雙塔聯體分幅斜拉橋施工控製參數對結構的影響，結閤濱海新城曹娥江大橋主橋（主跨300 m的四索麵雙塔聯體分幅斜拉橋）工程，採用有限元法分析瞭攷慮兩幅橋不同步施工、邊跨現澆段支撐剛度以及施工過程斜拉索垂度等參數下結構的內力和線形。結果錶明：兩幅橋彼此獨立時，左右幅不同步施工對結構內力和線形基本無影響；兩幅橋不同步施工對塔頂縱嚮位移、中跨主樑豎嚮位移以及邊跨索力有一定影響，主樑邊、中跨閤龍誤差分彆可達7 mm、10 mm ；邊跨現澆段支撐剛度對施工過程以及成橋狀態的內力和線形均有明顯影響；長懸臂施工狀態，主樑混凝土澆築一半時，斜拉索垂度對結構內力和線形的影響顯著。
위료해쌍탑련체분폭사랍교시공공제삼수대결구적영향，결합빈해신성조아강대교주교（주과300 m적사색면쌍탑련체분폭사랍교）공정，채용유한원법분석료고필량폭교불동보시공、변과현요단지탱강도이급시공과정사랍색수도등삼수하결구적내력화선형。결과표명：량폭교피차독립시，좌우폭불동보시공대결구내력화선형기본무영향；량폭교불동보시공대탑정종향위이、중과주량수향위이이급변과색력유일정영향，주량변、중과합룡오차분별가체7 mm、10 mm ；변과현요단지탱강도대시공과정이급성교상태적내력화선형균유명현영향；장현비시공상태，주량혼응토요축일반시，사랍색수도대결구내력화선형적영향현저。
To examine the influence of construction control parameters on the structure of the two‐pylon cable‐stayed bridge with combined dual decks ,the main bridge of the Caoejiang River Bridge in the Binhai New City ,a two‐pylon cable‐stayed bridge with a main span of 300 m and with combined two decks and four cable planes ,was cited as an example .The finite element model of the bridge was established to analyze the influence of parameters ,such as unparallel construction of the two decks ,supporting stiffness of the side span cast‐in‐situ section and the verticality of the stay cables during construction on the internal force and geometry of the structure .T he results in‐dicate that when the two separated decks are independent ,and the unsynchronized construction of the left and right decks show slight influence on the internal force and geometry of the structure . The unsynchronized construction of the two decks has certain influence on the pylon‐top longitudi‐nal displacement ,vertical displacement of the central span main girder and side span cable forces . The closure errors in the side spans and intermediate span of the main girder are up to 7 mm and 10 mm ,respectively .T he supporting stiffness of the side span cast‐in‐situ section has apparent influ‐ence on the internal force and geometry of the structure during construction process and in comple‐ted bridge state .Under the long cantilever casting condition ,when the casting of main girder con‐crete was half finished ,the verticality of stay cables exerted significant influence on the internal force and geometry of the structure .
