摘要
受地形、地质和水文等条件限制,工程施工中传统的主梁平衡对称施工往往无法实现,需要考虑不对称或不平衡施工方案。以中开高速银洲湖大桥斜拉桥为工程背景,首先采用两套有限元软件对常用的先边跨支架施工、后中跨主梁悬臂施工的方案进行数值模拟,对比主要计算结果表明两者吻合较好。之后,基于其中一套有限元软件建立先边跨支架现浇、后中跨悬臂吊装施工,同步配重的对称双悬臂施工,不同步不对称的双悬臂施工,同步不对称的双悬臂施工等4种主梁施工方案的有限元模型,通过调整斜拉索索力和配重等参数,验证了4种方案均为可行方案,并通过经济技术比较分析确定采用同步不对称的双悬臂主梁施工方案。接着,对采用同步不对称的双悬臂主梁施工的标准梁段的3种不同施工方案分别进行有限元建模,通过调整斜拉索索力,发现3种标准梁段施工方案亦均为可行方案,然后通过技术比选确定了最优方案及其流程,用来指导该桥主梁施工。通车前的标高和索力通测数据分析表明,斜拉桥同步不对称的双悬臂主梁施工技术安全可靠。
Due to the constraints of terrain,geological and hydrological conditions,the traditional balanced and symmetrical construction of the main beam is often impossible,and it is necessary to consider the asymmetric or unbalanced construction scheme.Taking the cable-stayed bridge of the Yinzhouhu Bridge on the Zhongkai Expressway as the engineering background,two sets of finite element software are used to numerically simulate the commonly used construction schemes of the first side span bracket construction and the second mid span girder cantilever construction.Comparing the main calculation results,it is found that the two are in good agreement.Then,based on one set of finite element software,finite element models are established for four girder construction schemes:cast-in-place side span support followed by mid span cantilever lifting,symmetrical double cantilever construction with synchronous counterweight,asynchronous asymmetric double cantilever construction,and synchronous asymmetric double cantilever construction.By adjusting parameters such as cable force and counterweight,all four schemes are verified to be feasible,and the construction plan for synchronous asymmetric double cantilever girder is determined through economic and technological comparison.Finite element modeling is conducted on the three construction schemes of standard beam segments for synchronous asymmetric double cantilever girder construction.By adjusting the cable tension of the stay cables,the three construction schemes of standard beam segments are also practicable.The optimal scheme and its process are determined through technical comparison,guiding the girder construction of the bridge.The analysis of the elevation and cable force measurement data before the opening of the bridge indicates that the synchronous asymmetric double cantilever girder construction technology of the cable-stayed bridge is safe and reliable.
作者
吴健
温东昌
张玉平
茹超
WU Jian;WEN Dong-chang;ZHANG Yu-ping;RU Chao(Road and Bridge South China Engineering Co.Ltd.,Zhongshan 528400,China;Changsha University of Science&Technoloy,Changsha 410114,China;CCCC Highway Bridges National Engineering Research Centre Co.Ltd.,Beijing 100088,China)
出处
《公路》
北大核心
2024年第4期82-87,共6页
Highway
关键词
桥梁工程
斜拉桥
双悬臂主梁施工
有限元分析
同步不对称
bridge engineering
cable-stayed bridge
double cantilever girder construction
finite element analysis
synchronization asymmetry—87—
