中文摘要：

为了解大跨度钢桁梁斜拉桥无砟轨道桥面竖向静力刚度特性,以某铺设双块式无砟轨道的大跨度钢桁梁斜拉桥为研究对象,建立钢桁梁无砟轨道桥面局部精细化模型,分析不同道床板布置情况下轨道整体刚度在桁架节间内的变化规律,对比钢桁梁斜拉桥、普通线路及混凝土简支桥上无砟轨道桥面的轨道整体刚度差异.结果表明：钢桁梁斜拉桥正交异性板桥面的自身刚度变化对轨道整体刚度均匀性有一定的影响,道床板接缝对轨道整体刚度均匀性有较大的影响.

英文摘要：

In order to understand the vertical static stiffness characteristics of the ballastless tracks laid on the floor of the long-span steel truss cable-stayed bridge,taking a long-span steel truss cable-stayed bridge with double-block ballastless tracks as the research object,the locally refined finite element model of the bridge floor of ballastless tracks and steel trusses was established to analyze the changing law of the integral stiffness of ballastless tracks in truss spacings in the cases of different arrangements of track slabs.The integral stiffness of ballastless tracks laid on the long-span steel truss cable-stayed bridge was compared with that of ballastless tracks laid on common railway lines and on ordinary concrete simply-supported bridges.The results show that the inherent variations of stiffness of deck orthotropic plates of the steel truss cable-stayed bridge have some influence on the uniformity of integral stiffness of tracks,and the joints between track slabs have significant influence on the uniformity of integral stiffness of tracks.