混合梁斜拉桥受力性能优越,但是钢混结合段受力复杂,大大增加了其设计难度。为了保证全桥的安全性和使用性能,该文采用有限元程序对某大跨斜拉桥钢混结合段进行仿真分析,得出如下结论:1)应尽量降低钢箱梁加强段顶底板U肋处突变;2)距离承载板较远处应采用刚度滞后剪力键;3)混凝土密实度对剪力键受力影响很大;4)结合段设计时应考虑剪力滞效应的影响。 The hybrid girder cable-stayed bridge has superior mechanical performance, but its mechanical strength is complicated, which greatly increases its design difficulty. In order to ensure the safety and performance of the whole bridge, finite element program is used to simulate the steel-concrete combined section of a long-span cable-stayed bridge. The conclusions are as follows: 1) 3) The density of concrete has a great influence on the shear stress; 4) The influence of shear lag effect should be considered in the design of joint section.