Abstract:In the later operation of long-span continuous rigid frame bridge, the problems of stiffness decrease and mid-span deflection increase often occur. To solve this problem, it is necessary to study the influence law of mid-span bending deflection of long-span continuous rigid frame bridge. In the study, the cantilever construction of continuous rigid frame bridge is simulated by segmental concrete joint flexural test. And the study considered that whether the specimen is segmented, whether the section is chiseled after segmentation, reinforcement layout, prestress and other factors. Meanwhile, different bending deflection theories are compared and analyzed, which provides reference for the bending deflection control of bridge segmented joints. The experiment shows several results. Removal of cross section slurry can effectively improve the binding capacity of concrete at joints. With the increase of the spacing between bars, the improvement of the flexural performance of concrete segments is gradually weakened. Increasing perstress can effectively delay the cracking time of the beam. At the same time, applying high level prestress is available to control the mid-span deflection. In the case of safety, the calculated value of deflection using absolute static moment instead of inertia moment is closer to the measured value.