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  • Author or Editor: Edward Petzek x
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In this paper the most relevant and an important aspect of the motorway crossings is presented. The composite bridges are, in comparison with steel bridges and concrete bridges, the most proper solution for motorway crossings because they are efficient, the erection time is shorter and the “in situ” operations can be minimized. The attention is focused on general design criteria of these crossings. Fabrication and erection methods have a big influence on the detailed design of the steel structure. The supporting steel members must be designed so that they do not interfere with the placing of concrete slab.

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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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