Analysis of the downward deflection parameters before and after external prestressing reinforcement of continuous rigid frame bridges
DOI:
https://doi.org/10.14311/Keywords:
Continuous rigid frame bridge, External prestressing, Reinforcement, Downward deflectionAbstract
Due to a lack of foresight by designers during bridge planning, outdated specifications that have not been updated in a timely manner, or construction errors during the building process, bridge structures may be overloaded, ultimately leading to excessive deflection in the main span of continuous rigid frame bridges. Therefore, it is urgent to study the causes of downward deflection in continuous rigid frame bridges and explore their reinforcement methods. This paper addresses the issue of severe mid-span deflection in a specific continuous rigid frame bridge and investigates the iMPact of various factors, including internal prestress loss, stiffness reduction, shrinkage and creep, over-excavation (possibly referring to excessive excavation or over-dimensioning in construction), shear deformation, external prestress loss, and overloading, on the downward deflection of continuous rigid frame bridges. The study identifies the most significant factor contributing to this deflection. Upon comprehensive coMParison of all factors, stiffness reduction is found to be the primary cause of mid-span deflection. For reinforced bridges, external prestress loss and overloading are the most critical factors. In calculations for continuous rigid frame bridges, shear deformation cannot be neglected.
Received: 22.05.2025
Received in revised form: 28.06.2025
Accepted: 11.11.2025
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