1,721,020 research outputs found
Le strutture murarie del Santuario della Madonna della Salute di Monteortone.
No full textIl santuario di Monteortone e’ stato oggetto di approfonditi studi riguardanti l’affidabilità statica delle strutture, in seguito ai cedimenti e alle fessurazioni manifestati fin da pochi anni successivi alla sua edificazione.
Molto importanti sono stati gli interventi di consolidamento, riguardanti prevalentemente le opere di fondazione, condotti negli anni settanta.
Le piu’ recenti osservazioni risalgono al periodo 2004-2005, durante il quale sono state condotte indagini non distruttive sulle strutture al fine dell’identificazione meccanica dei materiali e delle strutture principali ed è stato realizzato un monitoraggio, durato dodici mesi, dei principali parametri meccanici e geometrici. La presente memoria riguarda le analisi numeriche, condotte utilizzando un codice di calcolo a elementi finiti, per valutare lo stato di fatto e alcune ipotesi di consolidamento - con livelli diversi di tensionamento dei tiranti - sia agli stati limite ultimi sia agli stati limite di esercizio
"Recenti indagini sperimentali sull'effetto del confinamento sul calcestruzzo sottoposto a prove cicliche di compressione"
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"Theoretical performances of r/c structural elements built at the turn-of-the century"
Full text linkIn the 19th century, the invention of reinforced concrete (RC) technology paved the way for
innovation in building methods, though its actual mechanical behavior was not fully understood for some time
afterwards. The early period of the inventors and builders, such as Jean Bordenave, Paul Cottancin, A. Bonna,
Franc ̧ ois Hennebique, Edmond Coignet, and N. de Tedesco, was followed by a time of intensive activity for the
theorists, who developed several accurate analysis methods. A considerable contribution to this success came
from the builders themselves, who adopted methods capable of achieving an effective distribution of the rein-
forcement, and from the technical literature, which facilitated the growth of this new technique. Initially, the
theories were somewhat confused because different, sometimes contrasting approaches were used by different
authors. By way of example, suffice it to mention the hypotheses developed by Mattias Koenen, P. Neumann,
Edmond Coignet, N. de Tedesco, Max Ritter von Thullie, Josef Melan, J. B. Johnson, Le ́ on Stellet, L. Lefort,
F. Chaudy, Josef Anton Spitzer, Wilhelm Ritter, and Armand Conside` re. However, RC became a highly successful
material for the 20th century, capable of satisfying the most challenging demands of designers and customers.
In this paper special attention is paid to the contribution of the theories suggested at the time, in order to verify
their validity in relation to our present understanding
"Evaluating Performance of RC Beams Using Turn-of-the- Century Theories"
Full text linkWith the widespread use of reinforced concrete (RC) constructions in the latter decades of the
19th century in the main countries of Europe, a number of studies have been performed with a view to evaluating
the stress conditions in the structures built with this new material in mathematical terms. This paper deals with
part of a research program, one of the purposes of which was to identify any impressions emerging from
preliminary studies and investigations and having to do with current theories on RC or, in other words, to verify
whether there is any historical continuity between the hypotheses lying behind the early theoretical formulations
and our understanding of today. The various calculation methods for bending in singly reinforced slabs and
rectangular beams available from the scientific and technical literature around the turn of the century, presented
in the companion paper, are here numerically compared, to investigate whether and to what degree these veri-
fication and/or design methods are still reliable. The endpoint of the study was thus to provide an operator
planning rehabilitation or restoration work with more efficient tools to facilitate a better philological interpretation
of the structural behavior of historical RC structures
"Effects of Intercoil Structure Confinement on NET Toroidal Field Coil Structural Behaviour"
No full text"Influence of the Roebling of Superconducting Strands on Simple Bar Stiffness Matrix in NET Coil Superconductor Cores"
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"A Set of Programs for the Evaluation of the Buckling Critical Load of Variable Section Beam Elements"
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