Strengthening double curved arch bridges by using extrados section augmentation method

Abstract

Double curved arch bridges have played an important role in the history of bridge constructions in China. The strengthening or retrofitting of this type of bridge has attracted a great deal of research attentions in the Chinese bridge engineering community. In this paper, a novel strengthening method, i.e. the extrados section augmentation strengthening method (ESASM), has been reported. Firstly, the rationales of this new method and the resulting changes in internal forces have been studied in details. A numerical optimization analysis was then performed to reach a strengthening design solution based on these results. Secondly, a trial use of this novel strengthening method in a double curved arch bridge has been documented. A numerical simulation was carried out to analyze the internal forces in the bridge both before and after it was strengthened. Results show that internal forces have been favorably redistributed after the bridge has been strengthened by using ESASM.Lastly, the construction method and strengthening effect were discussed.

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