Experimental Research on the Anti-collision Performance of Fabricated Bridge Deck System for Railway Box Girder

Research purposes: In order to promote the application of prefabricated structure in railway bridges, this paper conducts experimental research on the prefabricated bridge deck system of passenger-freight railway box girder under train derailment load. In order to investigate the anti-collision performance of the new type of prefabricated bridge deck system, the full-scale test models of prefabricated bridge deck system and cast-in-place ballast wall were designed and fabricated, the static load test was carried out on the full-scale model, and the anti-collision performance of prefabricated bridge deck system of passenger-freight railway box girder was compared and studied. Research conclusions:(1) The ballast wall of prefabricated bridge deck system is basically in elastic state under the action of multiple cycles of derailment design load, which meets the design requirements. (2) Under the ultimate state, the main diagonal cracks appear in the ballast wall and damage. The ultimate bearing capacity reaches 1.44 times of the derailment design load, and has a certain safety margin. Compared with the cast-in-situ ballast wall, it has higher bearing capacity. (3) The bolt connection between the prefabricated bridge deck system and the bridge deck flange plate is safe and reliable under the ultimate state of train derailment load, which meets the requirements of anti-collision design. (4) Under the derailment design load, part of the mortar layer on the line side is deactivated, and the structural cracks are mainly concentrated in the bottom of the line side floor and the ballast wall of the line side, and the cracks on the ballast wall are distributed horizontally. (5) The test phenomena and results verify the correctness of the design method and assumptions, and draw the conclusion that the shear ultimate bearing capacity of the retaining wall should be checked. (6) The research results can provide reference for anti-collision design and structural optimization of prefabricated bridge deck system of box girder in high-speed railway and passenger-freight railway. © 2022, Editorial Department of Journal of Railway Engineering Society. All right reserved.