泰州大桥为世界首座千米级三塔悬索桥，建立泰州大桥的三维全桥模型，通过简化的车辆荷载模型，将随机车流加载于大桥有限元模型上，计算泰州大桥主梁不同位置竖向位移和弯矩的振动响应值，分析车流作用下大桥主梁应力变化最大位置，从而确定主梁的疲劳分析的关键位置。

Taizhou Bridge is the first kilometer level threetower and twospan suspension bridge in the world. The three-dimensional fullbridge FEM (finite element method) model of the Taizhou Bridge and the random vehicle loading on the bridge finite element model by simplified vehicle load model are established. The vertical displacement and bending moment values are calculated to analyze the position of the maximum stress for the steel box girder under vehicle load. Then the critical position can be determined to carry out fatigue analysis for the steel box girder.