永定河特大桥中承式系杆拱桥优化设计  

Optimal Design of Half Through Tied Arch Bridge of Yongding River Bridge

作　　者：潘迪 杨文忠 彭亚东 Pan Di;Yang Wenzhong;Peng Yadong(Beijing General Municipal Engineering Design&Research Institute,Beijing 100082,China)

机构地区：[1]北京市市政工程设计研究总院有限公司,北京100082

出　　处：《市政技术》2023年第1期139-146,共8页Journal of Municipal Technology

摘　　要：以主跨为300 m的京雄高速上跨永定河特大桥(中承式系杆拱桥)为背景,确定了主跨跨径与边跨跨径;对边孔主梁与主拱拱肋固结或分离的2种体系进行了对比;对不同拱轴系数进行了对比;对不同主梁形式进行了比选;并对全桥是否设置纵向伸缩缝、是否设置中跨系杆进行了比较,然后对拱桥的最后静力方案进行了优化。计算结果表明:边孔主梁与主拱拱肋固结效果较优、拱轴系数取值适中较优、中孔主梁采用双主纵梁体系的钢箱梁效果较优、边孔主梁采用钢主梁效果较优、辅助孔主梁采用预应力混凝土主梁效果较优、梁拱固结体系的中跨主梁设置纵向伸缩缝效果较优、系杆选取通长系杆较优。Taken the Yongding River Bridge(half-through tied arch bridge) with 300 m main span in Jingxiong Highway as the background, the main span and side span are determinate. Two systems of boundary beam consolidated with the rib of the main arch or not is compared;Different arch axis coefficients are compared;Different main beam forms are selected;That whether to set longitudinal expansion joint or not and whether to set a mid-span tie rod are discussed. The final static scheme of arch bridge is optimized by relevant conclusions. The calculation results show that the consolidation effect of boundary beam consolidated with the rib of the main arch is better, the moderate arch axis coefficient is better, the main beam with double main stringer system is better, the steel main beam to be side hole is better, prestressed concrete main beam to be auxiliary hole beam is better, longitudinal expansion joints in the middle span main beam of the arch consolidation system is better and through long tie rod is better.

关 键 词：中承式拱桥 优化设计 拱轴系数 

分 类 号：U448.52[建筑科学—桥梁与隧道工程]