The structural behaviour of masonry arches has been deeply investigated over the centuries, starting with the first theoretical approach by Hook in 1675. Later, with the introduction of the Theory of Elasticity, the graphical procedure illustrated by Méry (1840) gained high recognition in the field of arch design. More recently, following the formulation by Heyman (1966), which is based on Plastic Theory concepts, the modern Limit Analysis was introduced. Nevertheless, all these models are not able to describe the behaviour of arch structures in a comprehensive way, since they are not capable to predict the damage evolutionary process that affects the load bearing capacity of masonry arches.