符夹铁路青龙山特大桥空间刚架设计

小角度交叉桥梁结构中,空间框架结构具有结构高度低、整体刚度大、施工难度小、侧墙可打造多种景观需求等优点。符夹铁路青龙山特大桥地处中软土地基,小角度斜向上跨青符铁路联络线和两个下穿涵洞,对桥下通行净空和基础位置设置有较高要求。为了合理设计大桥,根据桥梁基本情况进行桥型方案比选,并对基础间断布置的空间刚架方案进行设计计算论证。结果表明,所选结构形式合理且为传统刚架结构提供新的扩展形式。

Design of Spatial Rigid Frame Structure of Qinglongshan Extra-long Bridge on Fujia Railway

With a view to bridge structures with small cross angle,there are many advantages of spatial rigid frame structures, such as lower construction height, high integral stiffness, less construction difficulty,convenient creation of a variety of landscape effects on side walls. Qinglongshan extra-long bridge is located in the soft soil foundation across Qingfu link railway and two underground culverts with a small oblique angle,which requires much on the space height under bridge and the foundation location.In order to achieve reasonable bridge design,the best bridge scheme is selected according basic bridge conditions,and design and calculation are conducted in perspective of spatial rigid frame with discontinuous foundation. The results show that the selected structure is reasonable and a new form of extension to the traditional rigid frame structure.