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The paper describes the present methodology for assessment of safety of bridges and the remaining life of steel railway bridges. The majority of railway existing bridges are riveted, and this field has been researched in former studies, but there are also many welded bridges. Many bridges are still in operation after damages, several phases of repair and strengthening. The replacement of old bridges raises some technical and financial problems. This is the main reason why new method for assessment, based on fracture mechanics principles is researched.

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Reacting to developments in building technologies of rival reinforced concrete bridges, new methods have appeared in the erection of steel- and composite bridges. A common feature of these methods is the ever-increasing size and mass of structures to be moved in one piece. Moving steel- and composite bridges is more complex than moving concrete structures, since they are more sensitive to temporary influences. This paper discusses experiences in methods of moving large structures, gathered on a number of major river bridges during the last 15 years. The longest of these structures measured 1060 m and the heaviest weighed 8900 tons.

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-2, EUROCODE 3 , Design of steel structures, Part 2, Steel bridges, 2005. EN-1992-2, EUROCODE 2 , Design of concrete structures, Part 2, Concrete bridges, 2005. EN-1994-2, EUROCODE

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The paper presents a case study that summarizes the monitoring results of a steel bridge strengthening project where a damaged structural element was temporary strengthened with fiber reinforced plastic sheet. The evolution of damage and the effects of strengthening were monitored with a computerized 24-channel displacement measuring system during normal traffic operation. The results of the monitoring project confirmed the efficiency of the proposed strengthening solution by comparing displacement results prior and after the strengthening intervention, and highlighted the need for applying a system that is capable to follow fatigue damage evolution.

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., Aminbaghai M., Weier H. Structural analysis software IQ 100 , (In Austrian) TU Vienna, 2004. STN EN 1993-2: Eurocode 3, Design of steel structures , Part 2: Steel bridges, Annex D: Buckling lengths of members in bridges and

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Z. Temporary strengthening of steel bridge element with FRP sheet , Pollack Periodica , Vol. 9 , No. 2 , 2014 , pp. 35 ‒ 44 . [16

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of the severe corrosion on the structural behavior of steel bridge members , Proceedings of the International Conference on Engineering Sciences and Technologies, ESaT 2015, Tatranská Štrba, High Tatras Mountains, Slovak Republic, 27-29 May 2015 , pp

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. , Macho M. , Stančík V. , Polák M. Deterioration and assessment of steel bridges , 8th International Conference on Bridge Maintenance, Safety and Management , Foz do Iguaçu, Brazil, 26-30 June 2016, Vol. 361-363 , 2013 , pp. 1442 – 1445

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