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Existing masonry bridges may appear to the eyes of observers as “natural” pieces, as though they had been there since ever. Nevertheless, their construction required large efforts and engineering skills. The interest on studying the building processes lies not only on the contribution to the construction history, but also on the importance of such a knowledge when assessing and refurbishing masonry bridges. This article aims to partially shed light on the lack of technical (and historical) knowledge that still exists on this topic. In essence, it provides information on centrings as a fundamental auxiliary structure employed for the building of bridge vaults. This goal is achieved by reviewing the technical literature on the topic (mainly Spanish, French, German and Italian treatises) and carrying out some numerical analyses on three different rigid centrings, with the goal of understanding their structural behaviour, and estimating their internal forces, deflections and reactions.

Construction Process of Vaults in Masonry Bridges: The Importance of Centrings