Abstract
Two sections of an old decommissioned filler-beam railroad bridge were test loaded in order to determine their structural performance and ultimate load. The loaded bridges were studied with two kinds of finite element (FE) models to observe how well the design theories of composite structures match the observed behaviour of the almost 100 year old bridge decks. The objects of research were the existence and level of composite action between the steel beams and the concrete slab as well as other factors related to the condition of materials or structural details that could have had an effect on the bearing capacity of the bridge. Comparison of the test results and FE models gave information on the structural behaviour of the loaded filler-beam bridge sections. The results can help in the assessment of other similar structures.
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