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Erschienen in: Meccanica 3/2019

19.02.2019

A non-smooth-contact-dynamics analysis of Brunelleschi’s cupola: an octagonal vault or a circular dome?

verfasst von: Valentina Beatini, Gianni Royer-Carfagni, Alessandro Tasora

Erschienen in: Meccanica | Ausgabe 3/2019

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Abstract

The cupola (dome) of Santa Maria del Fiore in Florence was ingeniously constructed by Brunelleschi using a conical bricklaying, radial-oriented toward a focus point on the central axis. Therefore, the dome is built as a surface of revolution but with parts cut away to leave the octagonal cluster vault form. This circular arrangement is compared with an octagonal horizontal corbelling in models where the dome is schematized as an assembly of rigid-blocks in frictional contact, analyzed with a Non-Smooth-Contact-Dynamics approach. The high indeterminacy of the contact reactions implies considerable difficulties in their determination, which are faced via a regularization procedure by adding a compliance at the contact points in representation of the deformability of the mortar joints. Numerical experiments, performed with a custom software, highlight the uniform flow of forces in the Brunelleschi arrangement, but evidence the disturbances induced by the herringbone spirals, mainly used for construction purposes, which are overloaded along the meridians and very weak in the direction of the parallels. This is due to the vertical narrow disposal of the blocks, which increases the stiffness in meridional direction, but diminishes the capacity of the friction-induced forces to equilibrate the hoop stress.

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Fußnoten
1
Leon Battista Alberti confirms that “Testudo camura atque item fornix armamentis substitutis inducatur, necesse est” (The Groin vault and the barrel vault have to be constructed with the support of centering), De Re Aedificatoria [3], liber III, Caput XIX.
 
2
Alberti (De Re Aedificatoria, liber III, Caput XIX), verbatim says: “Angularem quoque testudinem sphericam modo per eius istius crassitudinem rectam sphericam interstruas, poteris attollere nullis armamentis. Sed istic nexura potissimum opus est, qua huius imbecillae partes partibus illius firmioribus arctissime illigentur”. Alberti, at the begging of the same chapter, defines the various types of vaults (testudines), in particular the groin vault (spherica angularis) and the spherical vault (recta spherica).
 
3
The dual cone\({\mathcal {K}}^*\) of the cone \({\mathcal {K}}\) is a convex cone expressed as
$$\begin{aligned} {\mathcal {K}}^* = \left\{ \varvec{y} \in {\mathbb {R}}^n: \left\langle \varvec{y}, \varvec{x} \right\rangle \ge 0 \quad \forall \varvec{x} \in {\mathcal {K}} \right\} .\qquad (1) \end{aligned}$$
A Cone Complementarity Problem CCP(\({A},\varvec{b},\Upsilon\)) is the problem of finding a \(\varvec{x}\) that satisfies
$$\begin{aligned} {A}\varvec{x}-\varvec{b} \in \Upsilon ^*, \quad \varvec{x} \in \Upsilon , \quad \left\langle {A}\varvec{x}-\varvec{b}, \varvec{x} \right\rangle = 0 ,\qquad (2) \end{aligned}$$
where \(\Upsilon\) is a (convex) cone. One can also use the notation \({A}\varvec{x}-\varvec{b} \in \Upsilon ^* \bot \varvec{x} \in \Upsilon\). The CCP is equivalent to a Variational Inequality problem.
 
4
This is one of the first interpretations of the construction method used by Brunelleschi [5], not confirmed by successive studies. The particular bricks that were supposed to be used in proximity of the ribs were referred to as “mattoni a libro aperto” (open-book bricks), due to the shape that could be inferred, albeit tentatively, by observing a few spots in the interior of the dome, like that of Fig. 2b, where the brickwork is not hidden by the plaster. Later studies have confirmed that what is observed are sections of rectangular–parallelepiped shaped bricks with a dihedral angle formed by two planes intersecting on a line not parallel to any of the edges of the block.
 
5
As observed by Drucker [38], if normality fails the classical theorems of limit analysis are no longer valid for frictional sliding. Normality condition is preserved in the case of associative friction.
 
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Metadaten
Titel
A non-smooth-contact-dynamics analysis of Brunelleschi’s cupola: an octagonal vault or a circular dome?
verfasst von
Valentina Beatini
Gianni Royer-Carfagni
Alessandro Tasora
Publikationsdatum
19.02.2019
Verlag
Springer Netherlands
Erschienen in
Meccanica / Ausgabe 3/2019
Print ISSN: 0025-6455
Elektronische ISSN: 1572-9648
DOI
https://doi.org/10.1007/s11012-018-00934-9

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