1,720,991 research outputs found
A sustainable RC-framed skin for integrated seismic retrofit intervention on existing buildings: experimental and numerical characterization
No full textThis paper presents an innovative RC-framed skin for integrated and sustainable retrofit intervention of existing build-ings. A detailed description of the proposed skin technology is provided, focusing on the integrated improvement of structural (e.g. seismic) and non-structural (e.g. energy) performances as well as on the issues concerning the limitation of invasiveness and inter-ruption of use of the building. Some numerical analyses were carried out to design the experimental tests on the proposed RC-framed skin system by means of an advanced FE model implemented within the OpenSees framework. Modelling criteria, assumptions and the principal numerical results in terms of global response are presented and discussed. Experimental tests carried out on a full scale selected configuration of the proposed RC-framed skin are presented in terms of test setup, samples characteristics, cyclic loading protocol and some preliminary results are critically discussed
Miglioramento sismico di torri snelle in muratura mediante dispositivi isteretici e precompressione parziale
No full textIn Italy and in many Countries of the Mediterranean area, minarets and towers in general, brick or stone masonry made, represent one of the most valuable historical, artistic and architectural heritage. Moreover, the preservation and conservation of industrial heritage, of which masonry chimneys are one of the most relevant sign, are taking increasing importance. In slender masonry towers, axial forces resulting from self-weight often are close to the limit value of the masonry compressive strength. When they are located in seismic zones, the coupling of gravitational loads with dynamic actions can cause high damage and collapse even for moderate values of the seismic action.
The request of conservation of monumental heritage leads to the need for researching, testing and developing useful interventions aimed to the seismic improvement of slender towers. Indeed, for this problem an effective response have not yet found even for the difficulty of modeling towers behavior considering the material and geometry high nonlinearity.
This paper proposes a new solution for seismic upgrading of slender towers. The idea consists in the introduction of hysteretic elasto-plastic devices with inhibited instability (BRAD), coupled with a low level of partial pre-stressing of the tower.
The effectiveness of the proposed retrofitting method has been demonstrated with reference to a real bell tower. Non-linear dynamic analysis, using a set of seven spectrum-compatible accelerograms scaled for different levels of PGA, were performed on the tower above mentioned, varying the stiffness and the yield force of devices in order to identify the optimum design of the intervention.
For describing the dynamic behavior of the tower a numerical beam model was used. The nonlinearity of the material was described through a damage fibers model, whereas the hysteretic devices were described by means of nonlinear concentrated spring. The retrofitting performance was measured considering the various parameters of displacement, acceleration, and local and global masonry damage
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Long anchorage bond–slip formulation for modeling of r.c. elements and joints
No full textIn this paper a bond–slip relationship for long anchored bar has been proposed for modeling the structural behavior of r.c. elements and joints, able to take into account the interaction phenomena between ribbed bars and concrete also in condition of highly-stressed reinforcement. In such conditions some factors
play a key role in modifying maximum tangential stress which can be transferred, for example the variation of the section area of the bar due to the Poisson’s effect, as well as the modification of the geometry of the ribs due to yielding. The proposed formulation has been developed by considering mean parameters, in order to obtain a tool usable also with general-purpose finite element codes. A first series of validation tests have been carried out by means of FE simulations of experimental pull-out tests on long anchored bars. Then the proposed formulation has been applied to simulate the well-known experimental tests carried out by Leonhardt and Walter on beams and finally to reproduce the cyclic response
of a beam-column joint highly affected by the bond conditions of the longitudinal reinforcement
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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