Il destino delle cupole, tra crolli, demolizioni, consolidamenti e ricostruzioni_The destiny of domes, through collapses, demolitions, reinforcements and reconstructions

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The domes have always represented a great constructive and static task. Their courageous construction or, simply, a missed collapse could make famous the designer and the building where the dome was inserted (often at a second time, compared to the previous nucleus). Similarly the frequent collapses and decay marked failures and quality, both in reconstructions and in reinforcement cases. If earthquake was the greatest danger, it was not lesser the risk associated to bad realization, a diffuse practice especially effected in marginal areas, often masked by an high quality finishes. The frequent disasters since the post-Renaissance period led to specific studies relating to the most appropriate conformations of curve, to the physical characteristics of stony materials and to the convenience in the addition of wooden and iron elements, able to contrast the thrust actions. Contextually, reinforcing systems had been developed, adapting the usual techniques of masonry and simple vaulted structures to the more complex domes: from bindings us-ing special ashlars (with a double swallowtailed cut) or brick, to metal tie rods. It had to take account of thermal expan-sion, protection/waterproofing, accessibility for inspections and maintenance, in addition to a better position for guaran-tee static and aesthetic purposes, or even the presence of exceptional loads such as lanterns at the top and constructive systems also related to decorative/protective finishes. Where it was not possible to consolidate, domes were rebuilt us-ing new knowledge and materials. In more recent times an extensive use of reinforced concrete was made, in order to allow the maintenance of damages or for a total reconstruction of that domes collapsed for war bombardments or any further motives. We would analyze the application of general constructive principles on real cases of damage or typical reconstruction and consolidation interventions, both in the most famous monuments and in the Sicilian domes.
Lingua originaleItalian
Numero di pagine14
Stato di pubblicazionePublished - 2017

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