1,720,975 research outputs found
A Random Approach to Energy Based Design of Passive Control Systems for Seismic Protection of Structures
No full textSul controllo della risposta sismica di strutture intelaiate eccentriche mediante controventi dissipativi
No full textOn the Passive Control of the Seismic Response of Eccentric Structures by using Dissipative Bracings
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Experimental investigation on the seismic response of a steel liquid storage tank equipped with floating roof by shaking table tests
No full textIn this paper, the effectiveness of the base isolation on steel storage tanks has been investigated through numerical models and then checked by shaking table tests on a reduced scale (1:14) model of a real steel tank, typically used in petrochemical plants. In the experimental campaign the floating roof has also been taken into account. The tests have been performed on the physical model both in fixed and isolated base configurations; in particular two alternative base isolation systems have been used: high-damping rubber bearings devices and sliding isolators with elasto-plastic dampers. Finally, a comparison between experimental and numerical results has also been performed
Design of yielding or friction based dissipative bracings for seismic protection of buildings
No full textThe problems of designing dissipative bracing systems, based on yielding or friction mechanisms, for the seismic protection of buildings, either for new structures or the retrofitting of existing buildings are considered. After introducing a one-degree-of-freedom (one-DOF) model of a building equipped with dissipative bracings, inelastic response spectra, useful for designing the bracings, are considered. The extension of the design methodology to multi-DOF systems is also considered, paying particular attention to the distribution of stiffnesses and strengths within the structure. The results of a broad parametric investigation of simple shear-type models are discussed
Prove sperimentali su tavola vibrante di un serbatoio isolato alla base con dispositivi a elastoplastici
No full textIn questo lavoro vengono illustrati i risultati di una serie di prove dinamiche su tavola vibrante di un serbatoio metallico di 4 m di diametro riempito d’acqua fino a livello di un metro. Questo serbatoio è un modello in scala 1:14 di un grande serbatoio per lo stoccaggio del greggio in un impianto petrolchimico. Il serbatoio è stato provato nella condizione di base fissa, anche simulando la presenza del tetto galleggiante. Successivamente lo stesso serbatoio è stato protetto con dispositivi di isolamento alla base di tipo elasto-plastico e quindi sottoposto alle stesse serie di prove. I risultati hanno confermato l’attendibilità dei modelli numerici semplificati e l’elevata efficacia dei sistemi di isolamento nel dare luogo ad elevate riduzioni delle pressioni sul mantello e delle relative sollecitazioni, anche in presenza del tetto galleggiante. Al contrario, si manifesta un moderato aumento dell’ampiezza delle oscillazioni della superficie del liquido, parzialmente compensato dal sensibile aumento dello smorzamento, che riduce drasticamente il numero di oscillazioni libere del tetto nella fase post-terremoto
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
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