Abstract: Based on information entropy and uncertainty measurement theory， a model was developed to evaluate and sort the durability of bridges. First， the assessment index system and singleindex measurement functions were determined on the basis of Standards for Technical Condition Evaluation of Highway Bridges. Then， the evaluation matrix of singleindex measurement was achieved according to the field data. The weights of these indices were obtained from the information entropy theory， and the multipleindex measurement vector was calculated. Finally， the durability grade was assessed with credible recognition criteria. The durability of the threespan superstructure components of Hongzuizi Bridge located in Changchun was evaluated and sorted. The results were compared with that obtained according to the standards mentioned above， and the effectiveness of the proposed model was confirmed.

Key words: highway bridge, uncertainty measurement, durability assessment, credible recognition criterion, information entropy