1,721,015 research outputs found
Experimental methodology for measuring the structural dynamic transmission damping of a cultural heritage tower
No full textThis paper presents the dynamic
experimental campaign carried out on simple model
related to a stocky masonry clock tower situated in the
Swabian Castle of Trani (Italy). The main objective of
this paper is, after estimating the main frequencies
and vibration modes of the considered structure,
defining the influence on the structural damping
dynamic transmission of the frequency of excitement.
At this aim, firstly, an accelerations’ record has been
acquired simultaneously in 23 points of the tower at
different levels, both due to environmental vibrations
and to a series of sinusoidal forced vibrations applied
at the base by using a pneumatic shaker device specify
designed for the tests
Optimal model through identified frequencies of a masonry building structure with wooden floors
No full textThe paper presents the analysis of an important historical building: the Saint James Theater in the city of Corfù (Greece) actually used as the Municipality House. The building, located in the center of the city, is made of carves stones and is characterized by a stocky shape and by the presence of wooden floors. The study deals with the structural identification of such structure through the analysis of its ambient vibrations recorded by means of accelerometers with high accuracy. A full dynamic testing was developed using ambient vibrations to identify the main modal parameters and to make a non-destructive characterization of this building. The results of these dynamic tests are compared with the modal analysis of a complex finite element (FE) simulation of the structure. This analysis may present several problems and uncertainties for this stocky building. Due to the presence of wooden floors, the local modes can be highly excited and, as a consequence, the evaluation of the structural modal parameters presents some difficulties
Groin vaults-scaled by 3d printers: Seismic behavior with shaking table tests
No full textThis paper presents some preliminary results from a shaking table experimental campaign on a scaled model of a groin pointed vault, executed at the Earthquake and Large Structures (EQUALS) Laboratory at the University of Bristol, (UK) under the auspices of a H2020 SERA project (SEBESMOVA3D)
ANALYTICAL DEVELOPMENTS AND SHAKING TABLE TESTS ON DYNAMIC BEHAVIOR OF SQUAT SILOS CONTAINING GRAIN-LIKE MATERIAL
No full textFor the seismic design of flat-bottom grain silos containing grain-like material, the Eurocode 8
suggests that the horizontal actions on the walls of the silo are evaluated under the hypotheses
of (1) stiff behavior of the silo and its contents and (2) the effective mass which pushes on the
walls corresponds to the whole content of the silo except the base cone with an inclination
equal to the internal friction angle of the grain. This design approach seems to be overconservative
for squat silos. In a previous research work, the authors developed an analytical
study, which allows for substantial reductions in the seismic actions for silos characterized
by squat geometrical configuration. The analyses are developed by means of plain dynamic
equilibrium considerations and by simulating the earthquake ground motion with constant
vertical and horizontal accelerations and lead to the subdivision of the ensiled material into
three different portions. The findings indicate that, in the case of squat silos the portion of grain
mass that interacts with the silo walls turns out to be lower than the total mass of the grain in
the silo. Shaking table tests are currently under development at the lab facilities of the Bristol
University, under uniaxial constant, sinusoidal and earthquake input
PRELIMINARY RESULTS OF A SHAKING TABLE TESTS ON A 3-STOREY BUILDING REALIZED WITH CAST IN PLACE SANDWICH SQUAT CONCRETE WALLS
No full textStructural systems composed of cast in place sandwich squat concrete walls, which make use
of a lightweight material (for example polystyrene) as a support for the concrete, are widely
used for construction in non seismic areas or in areas of low seismicity, and appreciated for their
limited constructions costs, limited installation times, great constructions flexibility and high
energy and acoustic efficiency. If these cast-in-place squat concrete walls are assembled with
appropriate connections, a cellular/box behavior of the structural system is obtained which
leads to high strength resources (which allows not to use the post-elastic behavior and the ductility
resources) and high torsional stiffness. In recent years, from an exhaustive experimental
campaign it has been possible to obtain the structural performances of single panels composed
of cast-in-place sandwich squat concrete walls. A series of shaking table tests have been carried
out at the EUCENTRE in Pavia. The structural specimen which has been tested is a full-scale 3-
storey structural system composed of cast-in-place squat sandwich concrete walls characterized
by 5.50 × 4.10 meters in plan and 8.25meters in height. Shaking table tests have been developed
to validate the theoretically and partially-experimentally anticipated (through cyclic tests under
horizontal loads) good seismic behavior of cellular structures composed of cast in place squat
sandwich concrete walls
Shake Table Response of a Full-Scale 3-Storey Building Composed of Thin Reinforced Concrete Sandwich walls
No full textThis paper describes the results from a series of shacking table tests conducted on a fullscale reinforced concrete building. The specimen was a 3-storey structural system composed of squat cast-in-situ sandwich concrete walls with 5.50 m length, 4.10 m width and 8.25 m height. Shaking table tests were performed to validate the theoretical formulations which had been already developed by the authors in order to predict the seismic capacity of the tested structural systems. Both white noise and seismic tests were performed increasing the seismic intensity between 0.05 to 1.2 g. At the end of the experimental campaign, the building was essentially undamaged. From the white noise tests, a slight increase in the fundamental period was found, indicating some degradation. Although a meaningful interpretation of the test results in still under development, the structural system showed an impressive seismic capacity
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
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