Search results for " Confine"
showing 10 items of 115 documents
FE modeling of Partially Steel-Jacketed (PSJ) RC columns using CDP model
2018
This paper deepens the finite element modeling (FEM) method to reproduce the compressive behavior of partially steel-jacketed (PSJ) RC columns by means of the Concrete Damaged Plasticity (CDP) Model available in ABAQUS software. Although the efficiency of the CDP model is widely proven for reinforced concrete columns at low confining pressure, when the confinement level becomes high the standard plasticity parameters may not be suitable to obtain reliable results. This paper deals with these limitations and presents an analytically based strategy to fix the parameters of the Concrete Damaged Plasticity (CDP) model. Focusing on a realistic prediction of load-bearing capacity of PSJ RC column…
An experimental study on the compressive behaviour of calcarenite masonry columns wrapped by fiber reinforced mortar wraps
2018
The use of Fiber Reinforced Cementitious Mortar (FRCM) systems for structural retrofitting of masonry structures has become increasingly popular in the last years, due to the capability of this technique in overcoming some of the drawbacks related to the adoption of resin-based composites. In fact, FRCM systems ensure good compatibility between the reinforcing layers and the substrate, achieving also the removability requirement, which is of fundamental importance for historical constructions. Recent research studies focused on the mechanical performance of FRCM materials, by studying its tensile behaviour and bond between the strengthening layer and masonry, pointing out as failure is alwa…
Modelling steel jacketed RC columns: Remarks by experimental-numerical comparisons
2015
The recent large use of nonlinear seismic assessment techniques requires the definition of highly reliable computational models. The retrofitting or strengthening of RC columns by steel angles and battens is a commonly adopted technique, used to improve strength and deformation capacity of existing RC buildings. In the case of steel angles not directly loaded, the numerical definition of the cross-section model has to be handled carefully since it is affected by more uncertainties. The vertical load carried by the angles is a function of the lateral confinement pressure, the cohesion and the friction coefficient between the materials, parameters which are not always easy to predict. The pap…
PBO textile embedded in FRCM for confinement of r.c. columns
2014
Results of experimental tests on two reinforced concrete columns confined with PBO-FRCM jacketing subject to axial load and bending moments are presented, showing the effectiveness of the confinement system. Comparison of test results against theoretical results derived by a fiber model stress the ability of the confinement system to enhance both strength and deformation capacity of the confined concrete
L’architettura come elaborazione del confine
2018
La mancanza di un pensiero coerente sulla trasformazione dei luoghi ha contribuito, negli ultimi anni, a compromettere la qualità del paesaggio urbano siciliano, privando la campagna di una necessaria elaborazione estetica. Per questo sembra molto interessante riflettere non solo sul rapporto uomo-paesaggio, ma soprattutto sull’importanza del prendersi cura dei luoghi contemporanei. Il progetto di architettura consente di trovare la misura della costruzione, sulla valorizzazione dell’abitare.
La lezione degli orti, in Santo Giunta, Nei luoghi del design. Azioni e interazioni
2008
Il testo raccoglie un omaggio a Pasquale Culotta. Un'ispezione critica nei territori dell’architettura, dove oggi le “occasioni del progetto” si muovono e sembrano prediligere situazioni di bordo e confine da cui partire alla ricerca di tracce utili alla sua comprensione. Un campo di riflessioni nei luoghi della didattica che della città evidenzia gli spazi di relazione. Una metafora sugli “orti” che sono, per l'autore,i luoghi in cui le occasioni del progetto si manifestano. Gli “orti” diventano luoghi dove interagire per costruire un mondo migliore.
Gloria Fuertes: sconfinare
2022
La censura franchista, in vigore, in Spagna, a partire dagli anni Trenta, interviene su ogni manifestazione o prodotto culturale dell’epoca, con l’intento di diffondere l’ideologia promossa dal franchismo, mettendo a tacere qualunque possibile espressione di dissenso. Il presente lavoro si prefigge di analizzare la controversa figura della poetessa spagnola Gloria Fuertes, la quale, nonostante sia stata lungamente discriminata e confinata nell’ambito ristretto di una letteratura ritenuta marginale, è stata in grado di valicare i limiti imposti dal sistema egemonico e ritagliarsi uno spazio sacro di stridente resistenza antifranchista. Dopo una breve premessa sul concetto di confine e alcuni…
Do we understand the solid-like elastic properties of confined liquids?
2021
Recently, in polymeric liquids, unexpected solid-like shear elasticity has been discovered, which gave rise to a controversial discussion about its origin (1⇓–3). The observed solid-like shear modulus G depends strongly on the distance L between the plates of the rheometer according to a power law G ∝ L − p with a nonuniversal exponent ranging between p = 2 and p = 3 . Zaccone and Trachenko (4) have published an article in which they claim to explain these findings by a nonaffine contribution to the liquid shear modulus. The latter is represented as Δ G ∝ − ∑ λ = L , T 1 V … [↵][1]1To whom correspondence may be addressed. Email: giancarlo.ruocco{at}roma1.infn.it. [1]: #xref-corresp-1-1
Quantum confinement effects observed by the photoluminescence of SiOx/SiO2 multilayers
2012
Spectral and decay features related to the red emission from Si nanocrystals were investigated by time-resolved photoluminescence spectra carried out on SiOx/SiO2 nanosized multilayers. On decreasing the SiOx thickness from 8.4 nm to 2.2 nm this luminescence band exhibits a blue-shift from 1.65 eV to 1.75 eV and its lifetime increases from 12μs to 17 μs. These results are discussed on the basis of previous models proposed in literature and agree with quantum confinement effects arising from differently sized Si nanocrystals in our samples.
Verso un margine mobile: un'antologia in divenire
2010
Antologia multidisciplinare sulle tematiche del confine, del limite, del margine