Study on Long-term Deflection Control Performance of Long-span Prestressed Concrete Combination Structure Rail Transit Bridges

Rail transit bridges must meet stringent requirements for deflection control throughout the operation period. To provide a reference for the selection of bridge type and structure for long-span rail transit bridges, this paper conducted a comparative study of four PC(prestressed concrete) combination structure bridge types’ long-term deflection control performance. The structural configurations of the bridge types under research were trial designed using the same arrangement with a main span of 250 m and design parameters, and the Finite Element models for long-term deflection calculations were developed. According to the findings, all of these bridge types exhibit high vertical structural stiffness and excellent long-term deflection control performance, satisfying rail transit's technical requirements. Additionally, Excess weight and prestress loss have a less detrimental effect on arch-assisted girder bridges.

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