On the existence of optimal shapes in architecture

Michael Hinz (1) , Frédéric Magoulès (2, 3) , Anna Rozanova-Pierrat (2) , Marina Rynkovskaya (4) , Alexander Teplyaev (5)

1 Universität Bielefeld = Bielefeld University
2 MICS - Mathématiques et Informatique pour la Complexité et les Systèmes
3 University of Pécs
4 RUDN - Peoples Friendship University of Russia [RUDN University]
5 UCONN - University of Connecticut

We consider shape optimization problems for elasticity systems in architecture. A typical objective in this context is to identify a structure of maximal stability that is close to an initially proposed one. For structures without external forces on varying parts, classical methods allow proving the existence of optimal shapes within well-known classes of bounded uniformly Lipschitz domains. We discuss this for maximally stable roof structures. We then introduce a more general framework that includes external forces on varying parts (for instance, caused by loads of snow on roofs) and prove the existence of optimal shapes, now in a subclass of bounded uniformly Lipschitz domains, endowed with generalized surface measures on their boundaries. These optimal shapes realize the infimum of the corresponding energy of the system. Generalizing further to yet another, very new framework, now involving classes of bounded uniform domains with fractal measures on their boundaries, we finally prove the existence of optimal architectural shapes that actually realize the minimum of the energy. As a by-product we establish the well-posedness of the elasticity system on such domains. In an auxiliary result we show the convergence of energy functionals along a sequence of suitably converging domains. This result is helpful for an efficient approximation of an optimal shape by shapes that can be constructed in practice.

Mots clés: Elasticity system; shape optimization; trace and extension; fractals; Mosco convergence; stable roof structures under snow loads

Domaines: Equations aux dérivées partielles [math.AP]; Analyse fonctionnelle [math.FA]; Physique mathématique [math-ph]; Optimisation et contrôle [math.OC]

Michael Hinz, Frédéric Magoulès, Anna Rozanova-Pierrat, Marina Rynkovskaya, Alexander Teplyaev. On the existence of optimal shapes in architecture. Applied Mathematical Modelling, 2021, 94, pp.676-687. ⟨10.1016/j.apm.2021.01.041⟩. ⟨hal-02956458v2⟩