LINE OF THRUST AND ELASTIC EQUILIBRIUM IN MASONRY ARCHES

Abstract

This paper investigates the role of geometric configuration as the primary factor governing the stability of massive masonry arch structures. Based on a historical and theoretical review of the development of analytical methods, followed by a parametric analysis, the influence of the main geometric ratios—rise-to-span (f/L) and thickness-to-span (t/L)—on the position of the line of thrust is evaluated. The results demonstrate that the stability of the arch directly depends on the geometrically admissible position of the internal compressive force flow within the effective cross-section. The analysis confirms that geometry represents a key criterion for the load-bearing capacity and limit-state behavior of masonry arch systems.