Design and experiments on a new railway bridge system using concrete filled steel pipes

A new railway bridge system has been developed using steel pipes as the main girders, which are filled with concrete or air mortar depending on the span positions, and are also composite with concrete slab. This new girder could be not only economical but reduce noise and vibration induced by trains. Columns and piles are also concrete filled steel pipes. Pipe to pipe joint using concrete is applied to the pile-column and girder-column joints. This new bridge system is widely studied by analysis and experiments, among which three experiments are explained in this paper. Design detail of this bridge system is also presented.