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.%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.
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