The safety levels of these limit states were also investigated. The main emphasis is placed on the ultimate load bearing capacity, which is determined using various limit states, such as first hinge, incremental collapse and plastic collapse. In the first part of the study the necessary theoretical background is overviewed, the related literature is examined. The aim was to inquiry the plastic design in the framework of the Eurocode through an existing elastically designed bridge. However, the theoretical and experimental aspects of plastic design are well established only in the US provisions are available for the designers. The former provides the “cheap” stiffness and strength in compression while the steel in tension ensures the ductility. These structures are suitable for this due to the synergetic combination of the concrete and steel. The primary purpose of this thesis is to investigate the plastic reserve of composite plate girder bridges.
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