Creep Effect and Time-Varying Reliability Analysis of Prestressed Continuous Rigid Frame Bridge
IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation IABSE Congress Reports（2022）
This paper studies the long-term shrinkage and creep performance of C60 low shrinkage and low creep high performance concrete used in the main bridge of continuous rigid frame box girder bridge. The finite element model of the bridge is established by finite element simulation software. Firstly, the shrinkage and creep effect of the main bridge over a long time is calculated and analyzed by using the shrinkage and creep model of C60 low shrinkage and low creep concrete and different specification models of ordinary C60 concrete. The effects of shrinkage and creep on the internal force, stress, deflection and prestress loss of the main beam of the bridge under different loading ages are studied. Finally, combined with the prior information of concrete materials and data sample information, bayes method is used to predict the service reliability of the bridge. The research results can provide guidance for the long-term shrinkage performance and creep reliability of the bridge.
