梁桁组合结构在客运专线桥梁中的应用分析

为掌握梁桁组合这一新型桥梁结构的关键技术,以大西线晋陕黄河特大桥2×108 m单T刚构加劲钢桁组合结构为工程背景,通过论述梁桁组合结构在本桥中应用的合理性及加劲钢桁的必要性,并对梁桁组合结构的主梁梁高、加劲钢桁、节点设计、节点安装等设计难点逐一进行分析研究,最终得出梁桁组合结构的特点及应用范围。

Application Analysis of Composite Structure of Girder with Truss in Railway Bridges on Passenger Dedicated Line

The purpose of this research was to master critical technology of the composite bridge which not only is made from girder and truss but also is regarded as a new type of bridge structure.With respect to the super major bridge on the Datong-Xi'an Railway over the Shanxi-Shaanxi Yellow River,its 2×108-m composite structure of single T-shaped rigid frame with stiffening steel truss was cited as an example in this paper.By discussing the rationality of girder-truss composite structure and the necessity of stiffening steel truss used in this bridge,and by analyzing and researching the design key points of girder-truss composite structure one by one,such as the height of main girder,stiffening steel truss,joint design,joint installations and so on,the features and the application scope of girder-truss composite structure has been eventually obtained.