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Abstract

In this study, the concept of fuzzy mathematics was applied to the damage evaluation of existing reinforced concrete (RC) bridges. The partition rule of evaluation grade was used to divide the evaluation results. The damage state of existing RC bridges was carried out using a double layer fuzzy synthesis evaluation. Moreover, based on the results of the synthesis evaluation, the damage state of existing RC bridges was thoroughly partitioned. According to the evaluation results, the double-layer synthesis evaluation of fuzzy for the damage of RC bridge is definitely useful. The evaluation results are also offered as the basis for strategy on the repair and reinforcement of existing RC bridges. In order to verify this proposed method, the Huey-tong bridge, Jzyh-chyang bridge, Ay-gwo west road viaduct, and the old Hwan-nan viaduct in Taipei were evaluated. The investigated results indicate that the structural properties of the Huey-tong bridge belong to Grade I, II, III and IV which have the membership value of 0.334, 0.300, 0.191 and 0.175,respectively. The structural properties of the Jzyh-chyang bridge were attributed to Grade I, II, III and IV which have the membership value of 0.410, 0.337, 0.168 and 0.085, respectively. The Ay-gwo west road viaduct was the properties of Grade I, II, III and IV with 0.363, 0.326, 0.193 and 0.118, respectively. The old Hwan-nan viaduct was the properties of Grade I, II, III and IV with 0.354, 0.354, 0.198 and 0.094, respectively. The order repair and reinforcement is the Huey-tong bridge, Ay-gwo west road viaduct, old Hwan-nan viaduct and Jzyh-chyang bridge. Therefore, the fuzzy mathematics appears the advantage for evaluation the damage state of existing RC bridge.

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