Sunday, May 24, 2020

Double helix of masonry—Researchers discover the secret of Italian renaissance domes




Double helix of masonry -- Researchers discover the secret of Italian renaissance domes
The double Loxodrome technique is comprised of rows of vertical herringbone bricks that spiral around the dome and are filled in by horizontal field bricks. Effectively, each course of bricks creates a structural element known as a plate-bande or flat arch that wedges interior bricks between the vertical end caps to distribute load throughout the structure. Credit: Vittorio Paris and Attilio Pizzigoni, University of Bergamo; Sigrid Adriaenssens, Princeton University
In a collaborative study in this month's issue of Engineering Structures, researchers at Princeton University and the University of Bergamo revealed the engineering techniques behind self-supporting masonry domes inherent to the Italian renaissance. Researchers analyzed how cupolas like the famous duomo, part of the Cathedral of Santa Maria del Fiore in Florence, were built as self-supporting, without the use of shoring or forms typically required.
Sigrid Adriaenssens, professor of civil and  at Princeton, collaborated on the analysis with graduate student Vittorio Paris and Attilio Pizzigoni, professor engineering and applied sciences, both of the University of Bergamo. Their study is the first ever to quantitatively prove the physics at work in Italian renaissance domes and to explain the forces which allow such structures to have been built without formwork typically required, even for modern . Previously, there were only hypotheses in the field about how forces flowed through such edifices, and it was unknown how they were built without the use of temporary structures to hold them up during construction.
For Adriaenssens, the project advances two significant questions. "How can mankind construct such a large and beautiful structure without any formwork—mechanically, what's the innovation?" she asked. Secondly, "What can we learn?" Is there some "forgotten technology that we can use today?"
The detailed computer analysis accounts for the forces at work down to the individual brick, explaining how equilibrium is leveraged. The technique called discrete element modelling (DEM) analyzed the structure at several layers and stages of construction. A limit state analysis determined the overall equilibrium state, or stability, of the completed structure. Not only do these tests verify the mechanics of the structures, but they also make it possible to recreate the techniques for modern construction.
Applying their findings to modern construction, the researchers anticipate that this study could have  for developing  deploying aerial drones and robots. Using these unmanned machines for construction would increase worker safety, as well as enhance construction speed and reduce building costs.
Another advantage of unearthing new building techniques from ancient sources is that it can yield environmental benefits. "The  is one of the most wasteful ones, so that means if we don't change anything, there will be a lot more construction waste," said Adriaenssens, who is interested in using drone techniques for building very large span roofs that are self-supporting and require no shoring or formwork.
"Overall, this project speaks to an ancient narrative that tells of stones finding their equilibrium in the wonder of reason," said Pizzigoni, "from Brunelleschi's dome to the mechanical arms of modern-day robotics where technology is performative of spaces and its social use."Concrete printing in 3-D will put an end to boring buildings
More information: Vittorio Paris et al, Statics of self-balancing masonry domes constructed with a cross-herringbone spiraling pattern, Engineering Structures (2020). DOI: 10.1016/j.engstruct.2020.110440
Provided by Princeton University 



Masonic architecture

Featured snippet from the web

Symbolism based on architecture and construction laid the basis of all Masonic iconography. The trowel, the bevel, the compass and Solomon's Shrine are among the most recognised symbols of Freemasonry and they refer to its roots – the medieval builders' guilds (architects, masons, sculptors).Sep 20, 2014

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