1,720,968 research outputs found
A review on the current trends on computational modelling of masonry-infilled reinforced concrete frames
No full textA review of methods applicable to the study of masonry-infilled reinforced concrete frames (MIRCF), consisting both traditional and advanced solutions, and located in seismic zones is presented in this research. Firstly, this research presents a brief discussion about the main challenges on modelling the RC frames, masonry infills and interaction between them for structures located in seismic zones. Then, simplified and sophisticated approaches, which are actually used or developed for modelling both RC frames and masonry infills recently, are discussed. The main available strategies including simplified methods, and sophisticated finite element solution are considered with regard to their realism, computer efficiency, data availability and real applicability to large structures.</p
Testing and numerical modelling of circular stainless steel reinforced concrete columns
No full textChloride-induced corrosion of carbon steel reinforcing bars is considered the primary cause of deterioration of reinforced concrete (RC) structures. Stainless steel rebars have gained increasing attention in recent years as a promising alternative to the traditional carbon steel rebars to overcome the problem of chloride-induced reinforcement corrosion in RC structures. This paper presents the results of a new experimental testing program on two circular RC columns, subjected to lateral cyclic loading, reinforced with two different stainless steel reinforcing bar grades: austenitic EN 1.4301 and duplex EN 1.4362. A third RC column reinforced with carbon steel reinforcing bar was tested as a control specimen. The resultant force-displacement relationships, damage, energy dissipation, secant stiffness, and moment-curvature relationships from digital image correlation (DIC) are presented and discussed. Finally, an advanced OpenSees finite element model, validated against the conducted tests, for simulating the cyclic response of RC columns is presented
Experimental investigation of seismic behaviour of corroded RC bridge piers
No full textA summary of shaking table test campaign of three RC columns with different corrosion levels are reported. Accelerated corrosion procedure is employed to produce the desired corrosion level. This work aims to investigate the effects of chloride-induced corrosion on seismic behaviour of RC bridge piers located in a marine environment. The performance of two RC columns in this benchmark test, along with the test result of an uncorroded RC column obtained in authors’ previous work are compared. These three specimens are designed with same dimensions and reinforcement detail. All three columns are subjected to the same input ground motion. The test results of this benchmark shaking table experimental testing are analysed in terms of reinforcement corrosion rate, hysteresis characteristics, response frequency variation and time-effective stiffness monitoring.</p
Structural behaviour of axially loaded corroded low-strength RC columns with different confinement ratios
No full textMany ageing structures in earthquake-prone regions are vulnerable to failure by seismic actions resulting from poor detailing, environmental degradation and quality of materials used. Insufficient column confinement and corrosion of the embedded rebars have been identified as some of the problems with structures in such environments leading to severe damage during earthquakes. This paper presents summary of the result of an experimental investigation on low-strength reinforced concrete (RC) columns with different confinement levels and varying degrees of corrosion. The experiment was done on 20 short RC columns (10 squares and 10 circulars) with two confinements ratios and steel corrosion loss (0% to 30%) subjected to monotonic axial load. The result showed that the axial load carrying capacity and ductility of corroded RC columns reduced with increased in the corrosion mass loss ratios
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
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