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ANCHORAGE OF COMPOSITE LAMINATES IN RC FLEXURAL BEAMS
No full textThe flexural capacity of reinforced concrete (RC) beams can be increased by applying carbon fibre reinforced polymers (CFRP) in the form of fabric or laminates. Concrete elements strengthened with bonded FRP systems are often showing a brittle failure mode with premature delamination of the FRP ply at the concrete-FRP interface. This can be quite catastrophic and is undesirable since it does not allow exploiting the FRP mechanical properties to be fully utilized. The failure is often brittle. It has been was demonstrated that the use of anchoring systems (i.e., U-wrap or anchor spikes) are effective in order to raise the ultimate load; failure of the beam remains essentially brittle with a substantial drop of the load after the peak.
This paper basically focuses on flexural strengthening with pre-cured FRP laminates applied on RC beams with different anchoring devices chemically and mechanically applied. One beam was maintained as un-strengthened control sample. Two beams were strengthened using CFRP pre-cured laminates: for one of them, glass fibre anchor spikes were applied, the other was kept without anchoring. Two other beams were strengthened using hybrid pre-cured laminates having high longitudinal bearing strength: the laminate was bonded on one beam (steel anchors were also used to prevent/delay peeling) while was mechanically fastened (MF system) to the other one.
The results showed that the ultimate load of the strengthened beams was 35-80% higher than the control beam, depending of the type of strengthening system applied. The lower value corresponds to the beam strengthened using CFRP without anchor spikes, whose use increased the ultimate load of about 14%. The best performance of the strengthening was obtained for the beams strengthened with the hybrid laminates: steel anchors reduced the load drop after the peak while, in the case of hybrid system and mechanically fastened CFRP, the use of the MF system resulted in a pseudo-ductile mode of failure.
The experimental results were compared with analytical results obtained from the application of recently developed guidelines, that were published by the Italian Research Council (CNR). It is shown that design equations, even if material safety coefficients are disregarded, resulted conservative in both cases of unanchored and anchored FRP plate
Stiffness and ductility of fibre-reinforced polymer-strengthened reinforced concrete members
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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