1,720,958 research outputs found
Analysis and Performance of Piled Rafts Designed Using Innovative Criteria
No full textIn this paper the main criteria adopted for the design and some aspects of the observed behavior of the piled foundations of a cluster of circular steel tanks are reported. They were designed to store sodium hydroxide, a toxic liquid with a unit weight of 15.1 kN/m(3). Shallow foundations would have been safe against a bearing capacity failure, while the predicted settlement was beyond the allowed limit. Accordingly piles were designed to reduce the settlement and improve the overall performance of the foundations. While conventional capacity based design approach led to a total of 160 piles to support the five tanks the settlement based design approach led to a total of 65 piles achieving significant savings on the cost of the project. The settlements of four out of the five tanks were measured and for two out of the five tanks the load sharing among the raft and the piles was also observed. Both the analyses carried out at the design stage and the back-analyses of the observed behavior were based on the interaction factors method as implemented in the computer code NAPRA [Russo (1998), Int. J. Numer. Anal. Methods Geomech., 22(6), 477-493]
Piled Rafts on Layered Soils
No full textThe analysis of piled raft foundations in layered soils may be performed by 3D finite elements
or by approximate procedures. Among the latter, the code NAPRA (Russo, 1998) is based on
the method of the interaction factors and accounts for soil layering by the so called
Steinbrenner approximation. A comparison between the results of 3D FEM and NAPRA for
some reference layered soil profiles shows that the approximation is fully acceptable for
engineering purposes, provided the stiffness of the single pile is properly selected. The
interest of the conclusion lies in the fact that the amount of work needed to model a practical
problem by NAPRA is but a fraction of that needed by FEM modelling
Un caso sperimentale di fondazioni su pali al Porto di Napoli progettate con criteri innovativi
No full textPiles as settlement reducers: a case history
No full textThe design, construction and behaviour of the foundations of a cluster of circular steel tanks are reported. The tanks have diameters ranging from 10 m to 12 m and a height of 15 m; they are intended to store sodium hydroxide, a toxic liquid with a unit weight of 15.1 kN/m3. The subsoil consists of made ground overlying essentially cohesionless soils. Simple raft foundations would be sufficiently safe against a bearing capacity failure, but the predicted absolute and differential settlement have been judged not to be allowable in the present case. Accordingly, continuous flight auger bored piles have been adopted. If designed by the conventional approach, the piled foundation is rather expensive, requiring about 128 piles. On the contrary, the piles have been intended as settlement reducers, using only 52 piles while keeping settlement within acceptable limits. Two of the tanks have been instrumented to monitor settlement and load sharing between raft and piles. The paper reports the design analyses, based on a pile load test and carried out by the program NAPRA, and compares them with the experimental observations during the first filling of one of the tanks
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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