Abstract:Taking a rotational T-structure bridge spanning an existing high-speed railway on an expressway in Ningbo City as an example, the Rhinoceros and Grasshopper software is used to establish a parametric model. And the general finite element software ANASYS and MIDAS FFA are used to carry out the refined analysis of the solid model on the large-tonnage rotational T-structure system, and to explore the stress characteristic of the rotational system, which provide the reference for the design of rotational T-structures and similar projects spanning the existing railways.