111,853 research outputs found
Finite Element Modelling of the Archaeological Colonnade in Pompeii
No full textIn this paper, the seismic behaviour of an archaeological monumental colonnade under earthquake actions is examined through planar numerical simulations (nonlinear finite element analyses). The colonnade has two storeys with multi-drum columns and multi-blocks segmented trabeations. The scope of the analyses is to improve the knowledge on the structural behaviour of the innovative solution of segmented trabeation adopted in the ancient era for this colonnade and to evaluate the added vulnerability related to the effects of water leakage and pollutants in between the stone blocks of the structure as a result of the current degradation.
The ancient city of Pompeii in Italy, is a partially buried Roman town-city; after suffering many earthquakes in the past it was destroyed during a long catastrophic eruption of the Vesuvius volcano in 79 A.D. and remained covered until its accidental rediscovery in 1749. Nowadays, the ruins of the ancient town present many partially collapsed buildings, not only as a result of other earthquakes during the last three centuries, but also as a consequence of rapid degradation of the archaeological material. Numerical analyses show the seismic vulnerability of a colonnade, in order to understand how a UNESCO World cultural heritage site can be preserved, avoiding risks for cultural heritage and human life
Restraining bars buckling by means of FRP wrapping: an analytical approach
No full textInternal transverse steel reinforcements (e.g. stirrups) are the main internal devices that avoid the longitudinal
steel bars buckling, but in most of all existing RC structures the quantity and the spacing between steel stirrups
are inadequate. In these structures longitudinal bars buckling can be avoided by applying external reinforcement,
in particular, by means of Fibre Reinforced Polymer (FRP) wrapping. A novel analytical approach for the study
of longitudinal bars buckling in column wrapped with FRP is proposed. longitudinal bars has been considered as
axially loaded beam, while the mechanical effect of FRP wrapping on the bars has been modelled by means of
springs. The effect of elastic and inelastic behaviour has been taken into account by means of the reduced
modulus theory. The well-known relations for steel stirrups has been extended to the case of FRP wrapping to
propose an analytical formulation, valid both for circular and noncircular column cross sections, for the
evaluation of the FRP thickness needed to avoid the longitudinal bars buckling
Experimental investigation of the seismic performances of IMG reinforcement on curved masonry elements
No full textIn recent years, several new materials and technologies have been developed to limit the effects of earthquakes on the structures. In particular, for the structural reinforcement of masonry elements, the use of composite materials has shown to be effective. The experimental results of an innovative reinforcement technique based on inorganic matrixes, namely Inorganic Matrix composite Grid (IMG) are herein presented. The reinforcement has been applied to a full-scale masonry vault. Several shaking table tests (before and after the IMG reinforcement application) have been performed. The structural performance of the vault has been evaluated comparing the damages detected in the case of unreinforced and reinforced specime
Evaluation of different computational modelling strategies for the analysis of low strength masonry structures
No full textMasonry is a composite material characterized by a large variability of its constituent materials. The materials used, the quality of the bond and variations in the standard of workmanship significantly affect the mechanical performance of the overall masonry structure. Masonry structures, especially the historical ones, are usually characterized by low strength, due to a variety of reasons, namely low units and/or mortar strength or low bond; this makes more difficult to study these types of structures according to general rules because of different structural schemes. The aim of this paper is to evaluate the suitability of continuous FEM (Finite Element Method) or discrete DEM (Distinct Element Method) approaches to analyse the behaviour of low strength masonry and to contribute to the knowledge and selection of the best approach with a cost and time effective solution. The comparison with experimental results on different low strength masonry validated the approaches and showed that, for low bond strength masonry, DEM approaches performed better compared to low unit strength masonry where the emphasis on joint behaviour in DEM approaches is less effective because the weak component is the unit
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
Metodologia per l'accertamento medico-legale dei risultati a distanza di discectomie lombari
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