Sensitivity analysis of bridge decks for high-speed railway bridges

Rahman, Abdullah
Continuous welded rail provides a smooth ride for railway traffic, the use of continuous welded rail allows the trains to reach higher speeds, where tracks are made to be continuous over supporting structure and discontinuities -embankment in front of and behind the bridge- the structure and the track jointly resist the longitudinal forces generated from rail traffic. Bridge structural properties can allow additional stresses in rail due to movement under variable actions. Bridge structure and track are interlinked by ballast. This interlink will result in an interaction between the track and structure. If the interaction between the track and structure kept under control, the track and bridge will continue to fulfill their function without any damage into the track. In this thesis, parameters affecting the track-structure interaction are identified to perform a sensitivity analysis. The parameters are bridge deck span, deck height, bending stiffness, and neutral axis location. The focus of this thesis is given to develop a simple method for calculating the combined effect with a live load amplification factor of 1.4 (α = 1.4). The Eurocode provides a simple method, but it is only valid for classified loads with α factor = 1.