1,720,964 research outputs found
Alteration of the stability domain of masonry arc structures
No full textThis study is motivated from the collapse of an old masonry building in the Southern Italy. FEM analyses are carried out focusing on the influence of the contrasting wall on the stability of the vault. The structure is subjected to a damage scenario on the contrasting wall due to a demolition project, and the consequence of the damage is evaluated using the explicit dynamic simulation made by Ls-Dyna®. A micro modeling technique (discrete FEM model) is adopted to model the masonry: the mortar is modeled by contact surfaces between the masonry units, which are explicitly modeled by block of meshes. The analysis outcomes are thoroughly commented
Seismic performance assessment of precast element connections
No full textIn many typical R.C. applications, the reinforcing bars along certain alignments must be maintained continuous. Such continuity is usually obtained through overlapping arrangements and suitable end bents of the bars.
In the more critical contests, like in the case of buildings in seismic areas, more reliable continuity solutions are required. The same holds for blast scenarios. To this purpose a new type of coupling device assuring the bar
continuity has been recently proposed. This device is made of a steel external shell, which encloses a certain volume around the bars to be connected. The interstitial volume is filled by VHS Concrete which embeds the bar and assures the continuity with the steel envelope.
To assess the efficiency of this new device, many experimental tests were
performed. In particular, it was analyzed the behavior under cyclic loading of
columns having different height connected to the foundation structure by these
continuity devices and the behavior of a beam-column junction.
This paper presents the analysis for the investigations of the behavior of a
precast column having section 0.5 x 0.5 meters and 5 meters high. Both
experimental and numerical results are presented with particular attention to
the definition of the numerical model
Blast resistance assessment of a reinforced precast concrete wall under uncertainty
No full textAim of this paper is to compute both the fragility curves of a typical precast concrete claddingwall subjected to blast loads, and the failure probability of the cladding wall, considering a detonation of explosives placed on an automotive vehicle.To this aim, and taking into account corroborated literature, non-linear dynamic analyses are carried out by the widely adopted equivalent non-linear SDOF method. The fragility curves and the failure probability of the precast concrete cladding wall are computed using Monte Carlo simulations. © 2013 Taylor & Francis Group, London
Robustness assessment of a steel truss bridge
No full textThis study focuses on the robustness assessment of a steel truss bridge. In the first part, a brief overview of several robustness indexes found in literature is provided, together with the principal approaches on the topics of structural robustness, collapse resistance and progressive collapse. In the second part, the extensively studied I-35W Minneapolis steel truss bridge is used as a case study for the application of a consequence-based robustness assessment. In particular, focus is given on the influence that the loss of primary elements has on the structural load bearing capacity. © 2013 American Society of Civil Engineers
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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