170 research outputs found
Collapse of the Giotto Avenue Building in Foggia
No full textThe case that the researchers had to analyse on behalf of the Public Prosecutor's Office, was the initial failure that triggered the unexpected collapse of a reinforced concrete building during the night of November 11th, 1999. They also had to reconstruct the event starting from the individuation of the causes of such crumbling that is still remembered for its serious sacrifice of human lives. Together with the detailed report of the case, the paper intends to make a useful contribution to the crucial topic concerning the choice of the most appropriate method to perform this sort of autopsy, without neglecting any technical guideline
A first approach to optimum design of cable supported bridges using load path method
No full textBorn as a method to design strut-and-tie models in reinforced concrete structures, the load path method (LPM) shows its effectiveness in the easy perception of the physical behaviour of a structure, from its global behaviour to the most accurate details. In this paper, starting from the interpretation of cable-supported bridge behaviour using LPM, two different approaches are proposed for the shape optimum design of this particular type of bridge
Localized deformation in intensely fissured clays studied by 2D digital image correlation
No full textActa Geotechnica June 2013, Volume 8, Issue 3, pp 247-263 Localized deformation in intensely fissured clays studied by 2D digital image correlation C. Vitone, G. Viggiani, F. Cotecchia, S. A. Hall … show all 4 hide Citations 368 Downloads 200 Citations 9 Comments » Download PDF (3,181 KB) » View Article Abstract This paper represents a further step in a longstanding research on the influence of fissuring on the mechanical behavior of natural clays. The results of an experimental investigation into the influence of fissure orientation on the evolution of strain localization in the intensely fissured scaly clay from Santa Croce di Magliano (south of Italy) are reported. The experimental program involved plane strain compression tests where the effects of the combination of different factors, such as the specimen size and the orientation of fissuring, were investigated. A key aspect to this work is that the standard global stress–strain measurements were augmented by full-field displacement and strain measurements through 2D digital image correlation. Access to incremental strain fields provided information about slight details or anomalies as well as the complexity of deformation processes, which is of crucial importance for proper interpretation of test results at the global, macroscopic level
In collezione
No full textAttraverso una analisi delle opere selezionate all'interno degli archivi del CSAC dell'Università di Parma da Luca Vitone per la sua installazione si confrontano due canoni differenti, quello dell'artista e quello di chi ha creato ed incrementato le collezioni dello CSAC
Utilizzo dello Strut and Tie Model per la progettazione di particolari costruttivi delle strutture in c.a.
No full textValutazione del danno da frana per l’analisi di vulnerabilità in un’area urbana del Subappennino Dauno
No full textLa valutazione del rischio da frana rappresenta un tema di crescente interesse a causa del condizionamento dei processi franosi sullo sviluppo socio-economico dei centri urbani e sulle possibilità di conservazione del patrimonio storico-culturale. In Italia, questo problema è particolarmente sentito per l’estensione delle aree interessate dai movimenti di massa, spesso responsabili di danni ricorrenti a strutture ed infrastrutture. Con riferimento alle frane a cinematica lenta, le valutazioni di rischio di tipo quantitativo riguardano aspetti prevalentemente connessi alla suscettibilità o, in alcuni casi, alla pericolosità, limitando invece gli studi sulla vulnerabilità strutturale ad analisi di natura pressoché qualitativa. Questo contributo intende indagare gli effetti dell’interazione tra una classe di frane a cinematica lenta, ovvero gli scorrimenti roto-traslativi profondi, ed il patrimonio costruito sovrastante. In particolare, si presentano i risultati dell’applicazione di una nuova procedura di valutazione del danno da frana di edifici ordinari, sviluppata come step operativo di una metodologia multilivello per l’analisi di vulnerabilità alla scala del centro urbano. L’applicazione al comune densamente urbanizzato di Pietramontercorvino (sub-Appennino dauno pugliese), in un’area di affioramento di formazioni Flyschoidi, disomogenee e meccanicamente scadenti, ha consentito la classificazione degli edifici danneggiati da cedimenti di fondazione attraverso l’assegnazione del relativo grado di danno al singolo edificio. I risultati delle analisi geomorfologiche, geotecniche e strutturali alla scala del centro abitato sono confluiti nella ‘carta geotecnica del danneggiamento da frana’, strumento di supporto per l’analisi di vulnerabilità e la valutazione del rischio da frana nell’area
Utilizzo dello Strut and Tie Model per la progettazione di particolari costruttivi delle strutture in c.a
No full textThe influence of intense fissuring on the mechanical behaviour of clays
No full text The paper discusses the geological history, intrinsic properties, structural features and mechanical behaviour of three differently fissured clays outcropping within the Apennine chain in southern Italy. Based on a large experimental database, the mechanical behaviour of the clays is investigated in the light of their different fissuring features, which have been distinguished and characterised by means of a new chart. The study assumed the soil to be a continuum, despite the different fissuring features of the clay fabric. Therefore laboratory tests were carried out on both natural and reconstituted clay samples, and the results were compared with those recognised in the literature to be typical of unfissured sensitive clays. Based on these comparisons, a behavioural framework is proposed for clays possessing certain fissure structures. The results of the analysis show that the mini- to mesostructure of clays of fissuring intensity I5–I6 can be modelled as part of the structure variable controlling the clay behaviour. Where the structure variable refers solely to the micro scale for unfissured homogeneous clays, for fissured clays I5–I6 it spans from the micro to the meso scale. As for the microstructure of unfissured clays, this micro- to mesostructure influences the soil response as an internal state variable in addition to specific volume in controlling the mechanical response. In particular, it appears that for clays of fissuring intensity I5–I6, structure is detrimental to strength, so that the material is even weaker than the reconstituted clay. </jats:p
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