怀邵衡铁路沅江特大桥主桥设计

摘要

怀邵衡铁路沅江特大桥主桥为矮塔斜拉加劲连续梁组合结构,跨径为(90+180+90) m,采用塔、梁固结体系,综述该桥上部结构设计与计算。主梁采用单箱单室变截面混凝土箱梁；桥塔采用双柱式桥塔,塔高28 m；斜拉索为空间双索面体系,扇形布置。采用MIDAS Civil2006及BDAP程序对该桥进行结构计算分析,结果表明：该桥静力、稳定及动力特性均满足要求。%The main bridge of Yuanjiang extra-long bridge is a low tower cable-stayed continuous beam composite structure on Huaihua-Shaoyang-Hengyang railway with span (90+180+90 m) . The bridge is of fixed tower-beam system. This paper summarizes the design and calculation of superstructure. The beam is a concrete single cell box girder with varied section. The bridge towers are double-column and 28m high. The stay cable is a space double cable plane system in sector arrangement. The MIDAS Civil2006 and BDAP software are used for structure analysis of the main bridge. The results show that the static and dynamic performances of the bridge meet the requirements.