A 3-stage model is used to evaluate the results of an experimental campaign, previously carried out with the aim of studying the deflection of reinforced concrete structures made with reinforced concrete (RC) and fiber-reinforced concrete (R/FRC). In particular, 12 four-point bending tests were performed on beams, whose cross-sections were obtained by combin-

Stone and brick masonry bridges represent a significant portion of existing in-service bridges in Europe. A thorough understanding of their design and construction is essential to appropriately assessing, maintaining, rehabilitating and preserving these valuable structures. Unfortunately, relevant literature is fragmented and incomplete, leaving masonry bridges orphaned of doctrine and of treatment in modern codes. Based on a comprehensive review of some European treatises, especially Spanish and French ones, published in the 16th through the 19th centuries, this paper begins to mend the knowledge gap by summarizing the geometrical bridge configuration and the materials employed in their construction. Moreover, the initial steps of the design are illustrated, as an introduction for the second part of this two-part publication, relating to the construction process of masonry bridges.

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