ABSTRACT
This chapter analyses the collapse load of masonry buttresses in the framework of the macro-block modelling, accounting for either an overturning or a sliding failure condition. The masonry buttresses are structural elements mainly used in Gothic Cathedrals, with the static function to withstand the horizontal thrusts of arches and vaults. The horizontal actions, together with the vertical gravity loads, determine a combined compressive and bending stress in the masonry element that causes the cracking of the structure. If horizontal loads due to the inertia forces acting on the wall are absent and the masonry element can be considered only subjected to a concentrated inclined force, a simplified failure model accounting for sliding phenomenon can be adopted. Arches and vaults are often present within masonry buildings and, because of the mechanical properties of the material characterized by a low tensile strength, they exert inclined thrusts at their springings.
