Abstract:A rigid-frame bridge is widely used in crossing the existing roads because of its unique structural characteristics. Taking a new railway as the engineering background, according to the engineering situation of the site, the rigid-frame bridge with the different spans, clear height and skew angle is designed. Based on MIDAS plate element, the model is established to analyze the mechanical characteristics of the rigid-frame bridge, and then the reinforcement calculation is carried out to obtain more reasonable reinforcement calculation results, which can provide reference for the similar projects.