Geometry and Stability of a Double-shell Dome in Four Building Phases: The Case Study of Santa Maria Alla Sanità in Naples. Issue 2 (1st February 2023)

• Record Type: Journal Article
• Authors: Cusano, Concetta; Montanino, Andrea; Cennamo, Claudia; Zuccaro, Giulio; Angelillo, Maurizio
• Is Part Of: International journal of architectural heritage. Volume 17:Issue 2(2023)
• Page Start: 362
• Page End: 388
• Publication Date: 2023-02-01
• Subjects: Architectural heritage -- construction history -- equilibrium approach -- graphic statics -- limit analysis -- masonry domes -- membrane analysis -- under construction; Architecture -- Conservation and restoration -- Periodicals; Historic buildings -- Periodicals; Historic preservation -- Planning -- Periodicals; 721.0288
• DOI: 10.1080/15583058.2021.1922954
• Languages: English
• ISSNs: 1558-3058

Abstract

ABSTRACT: This research work provides a stability study for a double masonry dome during its construction process and, a consideration of the possible effects that the procedure followed for building the structure has on its current mechanical behaviour. In particular, the analysis is carried out on the Baroque dome of Santa Maria alla Sanità in Naples, a relatively small dome with a span of 12 m. The main contribution of the paper consists of making a hypothesis about the different phases of construction and demonstrating that the dome was in equilibrium during these different phases. This aspect has been rarely considered when analysing historical structures. The theoretical framework assumed refers to Limit Analysis in which the masonry is modelled as composed of rigid-unilateral material. To assess the stability of the dome, the study proposes an equilibrium analysis performed both graphically and analytically, by using the graphic statics and the membrane analysis. The results obtained from the two methods are also compared, at each stage of construction. Besides the classical graphical methodology based on the slicing technique, the membrane equilibrium solution provides a wider repertoire of equilibrium states, since it allows for biaxial stress fields and is here implemented with a new method for which the surface and the stress potential are both approximated through simplicial surfaces based on the same triangulation. This more refined analysis confirms the results obtained through graphic statics giving wider geometrical safety margins and a more detailed interpretation of the non-axisymmetric loading cases