A multidomain approach to strut-net models of masonry walls

This work presents an extension of the strut-net model for no-tension structures by introducing multiple structural domains interconnected through interfaces. Unlike earlier formulations that idealize the structure as a single continuous domain, the proposed framework assigns each domain an independent compression network and models interactions with adjacent domains through interface lines capable of transmitting active and reactive forces. Given a set of prescribed nodal forces and internal obstacle regions, defined by openings or by portions of nonreactive material, the problem reduces to determining a compressive network that equilibrates the applied loads, remains confined within the designated domains, and avoids the specified obstacles. When obstacles are approximated by convex polygonal shapes, the associated feasibility conditions can be expressed through a linear programming problem. Numerical examples involving two-story masonry walls with openings illustrate that the multidomain formulation provides a richer and more informative structural analysis than the classical single-domain approach.