在整体桥面结构中,下弦杆(系梁)和桥面系受力状态较复杂。桥面荷载在三主桁(拱)间的横向分配较二主桁(拱)复杂。结合在建中的京沪高速铁路南京大胜关长江大桥,进行三主桁道砟整体桥面板桁组合桥受力特性、计算理论和计算方法的研究,主要研究内容和成果如下。(1)研究横联刚度、? In the overall deck structure, the lower chord (tie beam) and the deck are more complex state of force. The lateral distribution of deck load between the three main trusses (arches) is more complicated than the two main trusses (arches). Combined with the under construction of Beijing-Shanghai high-speed railway Nanjing Dashengguan Yangtze River Bridge, the three main girder 砟 truss bridge deck mechanical properties of the bridge, calculation theory and calculation methods, the main research contents and achievements are as follows. (1) research transverse stiffness,?