Numerical Modeling and Assessment of the Ebe Schooner-Brig

Abstract

The Ebe schooner-brig was built in 1921 and sailed the Mediterranean Sea for almost 40 years before being dissected into 90 parts to be transported to Milan (Italy). There, the schooner was reassembled, and the naval pavilion of the National Museum of Science and Technology was built around the ship. After 45 years in the museum, the ship presents significant deformations of both the deck and the keel, particularly in correspondence with the external supports. Despite several interventions in the past and a recent restoration, the deformation phenomenon is still worrying, and the real cause has yet to be understood. Experts have already advanced some hypotheses, often in opposition to one another; unfortunately, a continuous monitoring of the ship deformation has not been installed. In the present study, the schooner structure is modeled with the commercial finite element code Diana, considering a two-dimensional model of the ship section and a three-dimensional model of the whole schooner, accounting for different levels of details and discretization. The results obtained allow for a deeper understanding of the stress-strain field in the schooner, providing a first safety assessment and useful hints for the design of the monitoring and future interventions.

Numerical Reconstruction in Maritime Archaeology

“…Invernizzi et al [34] carried out numerical modeling and an assessment of the brig Ebe Schooner. Both two-dimensional and three-dimensional FEM models were generated to cross-check various simplifying hypotheses.…”

“…Different wood prop were assigned to the two-dimensional FEM model, and stresses and deformations, in ing structural details, were ascertained in the cross-sectional model (Figure 10). A three-dimensional FEM model of the entire schooner was generated using finite elements [34]. Such a model is inadequate for an analysis of structural details, takes into account the interaction of all primary structural elements.…”

Geometric characterization of a cylinder-shaped structure from laser scanner data: Development of an analysis tool and its use on a leaning bell tower

“…Moreover, Armestro et al [11] proposes a local non-parametric modeling able to recognize deviations from the regular arch or vault shape in an ancient masonry bridge. In Fassi et al [12], a multistep modeling aimed to evaluation of the deformation of a complex architecture is shown, and an example of monitoring of a complex system like a ship is proposed by Invernizziet et al [13]. In general, a strongly automated approach where the acquired surface is modeled by means of local data fitting should be used.…”

The Column-Less Stair at Loretto Chapel in Santa Fe, New Mexico: Strength Analysis

“…A good numerical explanation can be in the form of stress calculation using finite element analysis and comparison against material strengths. Many related examples of this kind of analysis for wooden structures include Invernizzi (2016).…”