On the 14th of February, 2015, a huge fire broke out on Łazienkowski Bridge; a five span bridge, 423 m long and 28 m wide, built in the years 1972-74. It was a fully steel structure with four plate girders and orthotropic deck.The fire started under the first span during the replacement of wooden service decks. The next day, the Department of Bridges of the Warsaw University of Technology was designated to conduct an expertise material investigation, geometrical verification, and FEM model analysis. The subject of this paper concentrates on geometrical issues.The main difficulty of this task was the lack of full reference data regarding the bridge's original structure. The old design was incomplete and there was no actual surveying results for the undamaged structure. As a conclusion, some remarks focused on surveying measurements and on the final decision regarding this bridge are given. It was eventually exchanged into a brand new one and put into public use on the 28th of October, 2015.

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The paper presents chosen elements of a dynamic analysis of a rail bridge located on the CMK trunk railway line in Poland. The calculations cover solving an eigenvalue problem for the structure (theoretical modal analysis) using several computational models created with different discretization methods (different accuracy levels) and determination of the dynamic response of the bridge span (time-history analysis - integration of equations of motion) to loading with HSLM train models as per PN-EN 1991-2. The results were compared to the current code and regulations relating to high-speed rail systems.

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