两管平行单管提篮内倾三肢桁架拱稳定性研究

研究目的:虎跳门特大桥主桥是广珠铁路工程中的一个重大项目,主拱采用两管平行单管提篮内倾三肢桁架拱的新型结构。通过对拱肋内倾角、提篮内倾单管空间位置、不同类型横撑、拱肋截面等稳定性能影响因素研究,为该类型拱桥的优化设计提供技术支持,供今后类似工程参考。研究结论:提篮内倾单管内倾角度的增大有利于提高拱桥的稳定性能;单管空间位置对拱桥稳定性影响很小;拱脚处设置"K"撑对提高结构的稳定性非常必要;"米"撑、"K"撑对横向稳定性能的影响差别不大;增大拱肋截面对提高拱肋的横向稳定性影响很小。

Stability Study of Truss - arch with Three Tubes included Parallel Two-tubes and Basket Handle Inclination of One- tube

Research purposes:The main bridge of HuTiaomen River Bridge is one of the major projects of the Guangzhou-Zhuhai Railway;Main arch is a new structure of truss-arch with three tubes included parallel two-tubes and basket handle inclination of one-tube.Various influence factors were studied,including inclination of the arch ribs,spatial position of the basket handle one-tube,different types of crossbars and cross-sections of the arch ribs,thus making a optimal design and providing reference to the similar works in future. Research conclusions:The augmentation of the basket handle inclination of one-tube’s sloping angle is beneficial to improve the stability of the arch bridge,while the spatial position of one-tube has little effects on it.Besides,the design of K-type crossbar at the impost of arch is very necessary,which greatly improve the stability of whole bridge structure.However,there is no marked distinction on the structural stability between 米-type crossbar and K-type crossbar.Increasing the cross-section of arch ribs has little effects on improving their transversal stability.