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Progetto e Verifica allo S.L.U. di sezioni rettangolari in C.A. con sollecitazione composta di taglio e torsione
No full textIl presente lavoro si propone di illustrare un approccio ai procedimenti di progetto e verifica allo S.L.U. di sezioni rettangolari in calcestruzzo armato (c.a.) soggette a sollecitazioni composte di taglio e torsione, recentemente sviluppato dagli autori e che consente di risolvere il problema taglio-torsione in maniera unitaria ed organica.
Aspetto focale dell’approccio in questione è l’introduzione di un dominio di resistenza spaziale, le cui dimensioni sono le due sollecitazioni (taglio Vd e torsione Td) e la cotangente dell’angolo θ di inclinazione delle bielle compresse di calcestruzzo, tramite il quale l’individuazione dell’angolo θ che definisce le resistenze a taglio V(T)Rcd (θ) e a torsione T(V)Rcd (θ) consentite alla sezione nella sollecitazione composta, appare con chiara evidenza fisica.
Il tracciamento delle relative curve di resistenza è stato condotto seguendo due diversi criteri, ossia in funzione delle singole sollecitazioni agenti TEd e VEd, e in funzione dell’eccentricità e=TEd/VEd; tramite il primo vengono messe in evidenza le resistenze V(T)Rcd (θ) e T(V)Rcd (θ) al variare rispettivamente della torsione TEd e del taglio VEd, mentre tramite il secondo dette resistenze vengono esplicitate al variare del rapporto e=TEd/VEd. In termini di principio, ricordando i mondi di Flatland e Spaceland [1] immaginati dallo scrittore E. Abbott, si è inteso passare da distinti spazi a due dimensioni ad un unico spazio a tre dimensioni; in termini metodologici, prendendo le mosse da quanto indicato da Viollet le Duc in Storia di un Disegnatore (1879) [2] circa l’importanza del disegno «... spesso considerato, a torto, come un’arte speciale, mentre al contrario... è un’arte necessaria, ... perché disegnando si impara a vedere, e vedere è sapere», si è proceduto elaborando i classici tre grafici a due dimensioni (Vd - cotθ; Td - cotθ; Vd - Td), abitualmente utilizzati per la sollecitazione composta, e identificando un unico dominio resistente a tre dimensioni (Vd - Td - cotθ).
Il presente lavoro fornisce detto dominio di resistenza tridimensionale; l’approccio proposto è perfettamente in linea con quanto indicato nelle normative DM Infrastrutture 14 gennaio 2008[3] e Circolare 2 febbraio 2009 n. 617[4], Eurocode2 – Design of concrete structures [5] e tutto quanto reperibile in letteratura sull’argomento, ma ne fornisce tuttavia una visione non più disaccoppiata
SUL PROGETTO E VERIFICA ALLO S.L.U. DI SEZIONI RETTANGOLARI IN C.A. CON SOLLECITAZIONE COMPOSTA DI TAGLIO E TORSIONE: Dominio di resistenza spaziale = U.L.S. DESIGN AND CONTROL OF R.C. SECTIONS. SUBJECT TO SHEAR AND TORSION ACTIONS : Spatial domain of strength
No full textIl presente lavoro si propone di illustrare un approccio ai procedimenti di progetto e verifica allo S.L.U. di sezioni rettangolari in calcestruzzo armato (c.a.) soggette a sollecitazioni composte di taglio e torsione, recentemente sviluppato dagli autori e che consente di risolvere il problema taglio-torsione in maniera unitaria ed organica.This paper aims to illustrate a new procedure for the process of the Ultimate State Limit (USL) design and check of rectangular sections in reinforced concrete (RC) subject to composed stresses of shear and torsion. The new procedure can solve the shear-torsion problem in a unified and organic way
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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