U Frame Analysis to BS 5400 and BD56_96

The classic U-Frame action example can be found in “half-through” railwaybridges[1],[2] or pedestrian bridges. The key concept of the U-frame action isillustrated in Figure 1a. The two longitudinal girders are subjected to a saggingbending moment, which causes compression in the top flanges. At certainlocations along the bridge span, a continuous U-shaped frame is formed fromthe […]