1,720,959 research outputs found
Vulnerability curves for precast RC industrial buildings stricken by the 2012 Emilia (Italy) earthquakes
No full textThe 2012 Emilia (Italy) earthquakes struck a highly industrialized area including several thousands of industrial prefabricated buildings. Due to the lack of specific design and detailing for earthquake resistance, precast reinforced concrete buildings suffered from severe damages and even partial or total collapses in many cases. The present study reports a preliminary data inventory of damages from field survey on prefabricated buildings. The damage database, even though still incomplete, concerns more than 1100 buildings. Making use of available shakemaps of the mainshocks, the damages were related with the epicentral distance, and empirical vulnerability curves were developed. It was found that about 90% of severely damaged to collapsed buildings stay within 14 km from the epicentre and experienced a Pseudo-Spectral Acceleration for a period of 1 second (PSA at 1 s) larger than 0.13g. Moreover, 90% of slightly to moderately damaged buildings are located at less than 23 km from the epicentre and were affected by a PSA at 1 s larger than 0.07g. Finally, 10% of the undamaged buildings stay within 9 km from the epicentre and suffered from a PSA at 1 s not lower than 0.21g
Curve empiriche di vulnerabilità per gli edifici prefabbricati colpiti dai terremoti emiliani del 2012
No full textLa sequenza sismica emiliana del 2012 ha investito un’area fortemente industrializzata comprendente
alcune migliaia di edifici prefabbricati in c.a. A causa della mancanza di una specifica progettazione
nei confronti delle azioni simiche, molti di tali edifici hanno riportato gravi danni. Lo studio riguarda
un inventario preliminare dei danni riportati da 1133 edifici. L’entità dei danni è stata messa in
relazione con la distanza epicentrale e la Pseudo-Accelerazione Spettrale (PSA) corrispondente al periodo
di 1 s. In particolare, il 90% degli edifici gravemente danneggiati presenta distanza epicentrale inferiore a
14 km e ha risentito di una PSA maggiore di 0.13g. È poi significativo osservare come per il 10% degli
edifici senza danni la distanza epicentrale risulti inferiore a 9 km e la massima PSA risentita sia superiore
a 0.21g
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
Seismic risk assessment of a 50m high masonry chimney using advanced analysis techniques
Get PDFThe analysis of a brickwork chimney damaged by the 2012 Emilia earthquake is presented. A survey campaign revealed evident diagonal cracks and a significant mortar deterioration in the upper part of the structure. Laboratory tests were carried out to estimate the masonry properties. Lateral force method and pushover analyses using traditional force profiles were shown to be unable to capture the seismic behavior of the chimney. In contrast, the modal pushover analysis (MPA) using force distributions based on six modes of vibration led to crack patterns consistent with the observed damages. The behavior factor to be used in modal response spectrum analyses, estimated from the MPA results, was shown to be slightly higher than unity, indicating a very low dissipative capacity of the structure. Finally, a number of nonlinear response history analyses were carried out using natural accelerograms. In particular, an accurate finite-element model was built using rigid triangular elements connected by means of nonlinear interfaces that incorporate suitable tension, compression, and shear constitutive laws. The results systematically emphasized a shear failure mechanism of the upper part of the chimney. The residual deformations obtained from the analyses were close to those measured after the earthquake
Seismic assessment of a masonry tower in the region stricken by the 20-29 May 2012 Emilia-Romagna, Italy, earthquake
No full textA masonry tower (torre Fornasini), its construction dating back to the 13th century, and located in the Italian region stricken by the May 2012 earthquake sequence (Emilia earthquake) is analyzed by means of a series of sophisticated numerical models. In particular, the behavior of the cross vaults at the first storey level is the main focus of the present paper. During the earthquake???s main shocks, such vaults suffered from severe damages both on the intrados and on the extrados. Static analyses of the vaults assuming nonlinear constitutive laws with softening for both masonry and infill material are presented. In particular, to investigate the role played by the infill, preliminary incremental analyses under vertical loads are carried out. Then, the seismic response of the tower is assessed through a number of pushover analyses. From simulations results, it comes out that the crack patters obtained from the analyses are in a good agreement with the observed damages
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
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