Abstract:Earthquake disaster happens frequently in China. As the traffic lifeline, the seismic safety of urban elevated bridges is particularly important. At present in China, the precast small-box beam and prestressed concrete large-box girder are generally adopted in urban elevated bridges in China. From the perspective of seismic analysis, based on the different seismic stress characteristics of two structural types and the different structural designs, the two structures are compared so as to provide the reference for the selection of urban elevated bridges in the high seismic intension areas.