1,720,993 research outputs found
Manner to response to extreme rainfall events of some urban areas: the analysis of floods on 15th and 19th October 2015 in Samnium, Southern Italy
Full text linkThis paper focuses on natural hazards, such as landslides and floods, and on consequent disasters
that can suddenly hit extensive urban areas. The research aims to describe and detect the damages
due to unprecedented rainfalls that occurred among 15th and 19th October 2015 and that have led to
multiple calamitous events in the Municipalities of Benevento, in Southern Italy. It highlights the most
affected locations and common phenomena in order to document the past and present situation of
risk. This hydrologic event has resulted in simultaneous disasters in the different areas of the
Samnium, namely overflowing of the Calore river, massive flooding, intense erosions, extensive
landslides in the mountain areas and heavy damage to the constructions and infrastructures.
Particularly, the research concerns the vulnerability of the existent crossing structures in the examined
areas, e.g. some masonry bridges, that because of this event of flood have collapsed for a part. This
brief overview wants to be a reflection on the issue of natural disasters related to the definition of risk
scenarios and emergency management but especially to the extent of protecting the built heritage.
The evaluation of territorial threats could be a fundamental source of knowledge to deal with future
emergencies, by extending this approach all over the world, for planning and integrated development
in specific geographic areas with similar constructive features and problematics
The role of geometry on stability of large domes: Roman Pantheon as cultural emblem and constructive reference
No full textThis paper focuses on large domes’ building techniques and use of geometric rules in the design and construction of religious structures. A quick excursus on the cultural heritage in Italy and abroad highlights how domes have been used almost exclusively in sacred architecture, rather than in civic buildings, for most of history. Born of the need to cover large spaces without facing with the encumbrance of vertical elements, the domed cover, ideal for places of worship crowded by hundreds of faithful, has assumed, over the centuries, a symbolic meaning to every religion. In fact, identifying the shape of a large dome in the urban landscape immediately means to recognize the sacredness of that place. The ancient Romans who believed in the gods, Christians, Hindus and Muslims, all used this very peculiar architectural element in churches or mosques to express a kind of spiritual symbolism and, as mentioned, the fact that the shape of the dome arises from a functional reason, it has over time got pushed aside. Furthermore, the circle is a geometric form that possesses a great symbolic force, generated by the idea that, having no beginning and no end, reflected perfection, the eternal, and also the heavens. In this perspective, drawing a circle both in the horizontal and vertical section, the ultimate paradigm for all monumental domes was the Roman Pantheon which, with its centrally placed "oculus" or “eye of heaven” proved to be a model for all other domes after it, retaining its position as the most ancient and well preserved dome in the world. Therefore, this article concentrates on the study of the Pantheon as an emblem and reference model for all monumental domes. By analyzing the “meaning” of its architectural design and its structural and geometric characteristics, the research dissects a comparison between similar large domes, similar to each other, such as that of St. Francesco di Paola in Naples and the Mosta Dome in Malta. The comprehension of these valuable architectural artifacts lies between the search for their original geometry and the identification of structural models through which their shape was defined, namely the geometric and proportional rules of the past
CONSOLIDATION WITH REINFORCED CONCRETE FOR THE ECCLESIASTICAL ARCHITECTURE IN L'AQUILA (ITALY): OBSERVATIONS AFTER THE EARTHQUAKE
No full textThe dome and the buttress system of San Francesco di Paola in Naples. A stability analysis.
No full textIssues about the Determination of a Mechanical Model for Masonry Analysis
Full text linkThe work aims to describe the issue of the approach related to structural problems, both for valuable and minor manufacts existing in the Italian historical town centers. The heterogeneity shown by these constructive typologies should coincide with some heterogeneity of the structural approach, but this is not always feasible, so computational processes and a strict application of the norms are often used in automatically. A representative case, as an example of the above-mentioned kinds of buildings (which are valuable, but not so much as to require a tailored intervention that takes into account the whole constructive history and the changes over the time), is shown. Ricciardelli palace (or Palazzo Ricciardelli) presents a great difficulty as to the structural intervention, but the approach used was a "classical engineer approach", formulated on the basis of the new computing tools and the new constructive norms. The restoration and the consolidation of this artifact have been well conducted by technicians, but the result is an invasive intervention that doesn't respect the original structural configuration of the construction. So the paper explains and discusses some investigation methodologies, alternative to an elastic analysis, which could be used in these cases, with the awareness that they are not completely exhaustive and far far away from the determination of a general formulation for a “unique model”, which can be representative of the masonry material, as well as from a definition that catalogues all its several features
RELIGIOUS ARCHITECTURES UNDER THE EFFECT OF THE L’AQUILA EARTHQUAKE (ITALY). CRITICAL CONSIDERATIONS ON THEIR STRUCTURAL BEHAVIOR THROUGH THE ANALYSIS OF SOME CASE STUDIES
No full textGeometry and Stability of a Double-shell Dome in Four Building Phases: The Case Study of Santa Maria Alla Sanita in Naples
No full textThis 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 Sanita 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 case
Geometry and Stability of a Double-shell Dome in Four Building Phases: The Case Study of Santa Maria Alla Sanità in Naples
No full textTHE NEOCLASSICAL DOME OF SAN FRANCESCO DI PAOLA IN NAPLES. A STUDY ON FORM AND STABILITY.
No full textThe Basilica of San Francesco di Paola, located at the west side of Piazza del Plebiscito, historic center of Naples, was built as a completion of the square in front of the Royal Palace by the will of King Ferdinand IV (1816), designed by the Swiss architect Pietro Bianchi. The "The Bourbon Temple" is mainly characterized by its imposing coverage with hemispherical dome, which protrudes from the complex. It directly refers to the Pantheon for its geometric relations and proportions, its formal and compositive aspects, although it is not completely hemispherical and its interior does not enjoy the spatiality of its model. Further-more in origin the dome ended with a central oculus in which, even today, the structural forc-es converge and balance. Subsequently, a lantern was placed on the oculus, which is a conical element completely in glass that allows the passage of light.
The aim of this work is the study of the stability of the dome that, firstly, allows to specify the overall safety of the structure in its current state, especially with regard to statics. Secondly, to assess the degree of seismic safety of the structure, identifying the potential conditions of vulnerability in case of earthquake. The static analysis has been performed, by using the graphical method, according with the principles of the limit analysis applied by Heyman to the masonry structures. The methodological innovation consists in the use of the traditional methods of graphical calculation of masonry structures, interconnected with the new anti-seismic norms in the territory. The operational aspect of the work is contained in the interdis-ciplinarity of scientific fields, with the aim of obtaining a complete knowledge of the monument in its current condition without using an elastic analysis, which would not be suit-able for the study of historical buildings
The slicing technique for the evaluation of the formal efficiency: A comparative study
No full textThe paper starts by announcing its goal of comparing the information about the structural analysis of two Napolitan churches. Starting from the structural behaviour of two architectural elements, the ogival arch of the arcade of the Incoronata and the cross vault of S.Eligio, the research aims to provide a wider reflection on the method for assessing the sta-bility of historical architectures in masonry, respectively applied to a two-dimensional and three-dimensional scheme. Therefore, the study of these two Churches is presented with a dis-cussion on the results obtained with regard to the methodology approach to the analysis re-lated to their structural features.
The Incoronata Church and S. Eligio are two examples of Angevin architecture in Naples and over the years both them have undergone several transformations that have changed their original appearance. By considering the Viollet Le Duc assumption that “in architecture ge-ometric proportions are established primarily on stability laws, the laws of stability derived from geometry”, the work deals with a study of the form and stability of the system of arches and of the cross vaults to investigate the geometric-configurative nature of the structural ele-ments that constitute gothic architecture
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