广珠铁路虎跳门特大桥主桥连续刚构拱设计

摘要

广珠铁路虎跳门特大桥主桥采用(120+248+120)m连续刚构柔性拱组合结构,桥型与跨度在世界单线铁路桥梁中均居领先地位.详细介绍该桥的设计特色,研究(120+248+120)m刚构拱受力特性、承载能力、抗震、车桥动力响应等结构特性.该新型连续刚构柔性拱组合结构,梁拱共同受力,梁部弯矩通过吊杆转换为拱的轴向力,使拱与梁在受力方面的优点得以充分发挥,主梁承受弯矩及截面尺寸显著减小；由于拱的竖向加劲作用,结构竖向整体刚度大,外形轻巧；该桥具有良好的抗震及行车性能.%Main bridge of super-large Hutiaomen bridge on Guangzhou-Zhuhai railway adopted (120 + 248 + 120)m continuous rigid frame and flexible arch composite structure, both the bridge type and span are in the lead among the world single track railway bridges. The paper elaborates the design features of the (120+248 + 120)m bridge, studies the behavior, loading capacity, seismic and train/bridge dynamic responses and other structural characteristics of the rigid frame arch. This new type continuous rigid frame and flexible arch composite structure features cooperated work of beam and arch: moments in the beam transferes through tie rods and transformed into axial forces in the arch, giving full play to both the performance merits of arch and beam, moments and dimension of the girder are significantly reduced; relying on the vertical rigidity of the arch, overall vertical rigidity of the structure becomes very large while it appears light and wonderful; the bridge possesses good ability in anti-vibration and for traffic.