Abstract
Bridge capacities are assessed by different methods which differ in accuracy. The level of sophistication depends on the type of existing structure and the criteria of assessment required. However, in most cases, simplified models and the load distribution methods are sufficient and safe. In this paper, the live load distribution methods adopted for the analysis of existing bridges are presented. British and American distribution factors (DF) for the assessment of the structural adequacy of bridge structures in service are discussed. Also, in Poland a simple method of live load distribution has been adopted for load rating of existing road bridges. Examples of DF methods for analysing highway bridge decks are presented. The results are compared with the simplistic distributions and the accurate computer method.
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