1,720,982 research outputs found
Anchorage Capacity of Corroded Reinforcement on Eccentric Pull-out Tests
No full textReport No 2010:06, Department of Civil and Environmental Engineering, Structural Eng. / Concrete Structures, Chalmers University of Technology, 2010 (in press), Chalmers reproservice Publ., ISSN 1652-916
Bond Strength of Highly Corroded Reinforcement and Cover Delamination
No full textA recent experimental and analytical research program is described, providing bond strength values for highly corroded bars. The test program included both main reinforcement and stirrup corrosion. These results must be compared to the rather wide but scattered database of test results in this field. Two relevant sources for comparison are the indications of FIB MC2010, based on the existing literature, and some recently published test results (Regan and Kennedy Reid, 2009). The latter simulated the delamination of the concrete cover by casting the concrete either with zero minimum cover or at mid-barrel i.e. the bars had either no cover or even were partly external to the concrete; the reinforcement was not corroded. The conclusions discuss the choice of bond strength values for the assessment of existing structures and future research outlooks
Bond capacity of severely corroded bars with corroded stirrups
No full textEccentric pull-out tests were carried out to study the influence of severe corrosion leading to extensive cover
cracking, and the effect of corroded and non-corroded stirrups on the anchorage of deformed bars. The specimens
were subjected to a low-rate electrochemical corrosion process for three time spans that caused a rebar weight loss
up to approximately 20% in the main bars and 35% in the stirrups. Pull-out tests were then carried out in each
specimen, on either the two corner bars or the middle bar, to measure the bond capacity. The effects of corrosion and
the mechanical testing were simulated with non-linear finite-element analysis. The combination of tests and analyses
gives a better understanding of the effect of high corrosion penetrations and the presence of corroded stirrups on
failure modes. The presence of stirrups, corroded and non-corroded, was found to significantly change the behaviour
of an anchorage region, namely the corrosion-induced crack pattern, the failure mode and the bond capacity
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
Anchorage of corroded bars: eccentric pull-out tests and numerical analyses
No full textEccentric pull-out tests were carried out to study (a) the influence of cover cracking and (b) the effect of stirrups, on the bond of corroded bars. Next, anearlierdeveloped corrosion model was extended to include the effect of rust flowing through corrosion cracks.The extended model was used in detailed threedimensional analyses of the tests. The tests and analyses showed an important effect of the cover cracking in terms of loss of confinement and the flow of rust through the cracks. They also indicated that the bond behavior and the failure were strongly governed by the position of the anchored bar, i.e. corner or middle positions, and the level of the corrosion attack. Stirrups played an important role after cover cracking, as they then became the primary source of confinement. Furthermore, corrosion of stirrups led to a more extensive cover cracking for a relatively low level of corrosion attack
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
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