1,720,960 research outputs found
Floor Acceleration Demand on Steel Moment Resisting Frame Buildings Retrofitted with Linear and Nonlinear Viscous Dampers
No full textAn improvement of the seismic performance of a building can be achieved by adding
supplemental damping through viscous dampers. In some cases, however, the incorporation of viscous
dampers in the structure can cause an increment of the seismic demand on acceleration-sensitive nonstructural
elements. Two steel moment resisting frame buildings of three and six stories were selected from
the SAC Steel Project in California. These buildings were equipped with linear and nonlinear viscous
dampers designed by following a uniform distribution design approach in which a unique damping
coefficient is assigned to all dampers along the building’s height. Additionally, three target first modal
damping ratios were used along with six different velocity coefficients of the fluid viscous dampers.
Nonlinear time-history analysis was carried out with the FEMA P695 far-field ground motion record set.
The records were scaled to two intensity levels and floor acceleration time histories and 5% damped floor
acceleration response spectra were obtained. The results show that the implementation of viscous dampers
generally reduces the seismic demand in terms of floor acceleration compared to the original (nonretrofitted)
building in most cases. Nevertheless, the floor acceleration demand varies significantly when the
damping ratio and the velocity coefficient of fluid viscous dampers are varied. In some cases, the peak floor
accelerations and the floor spectral accelerations in certain non-structural period ranges can exceed that of
the original building
Expected seismic response and annual seismic loss of viscously damped braced steel frames
No full textExperimental and numerical simulation dataset of a ferrocement wall subjected to fully-reversed cyclic load test
No full textInfluence of Fluid Viscous Damper Stiffness on the Floor Acceleration Response of Steel Moment-Resisting Frames Under Far-Field Ground Motions
No full textThe implementation of fluid viscous dampers has been proven as a feasible method to improve the seismic performance of buildings. However, the different variables involved in the damper's design affect the structural response, especially in terms of seismic demand on non-structural elements. This paper presents a parametric study on the floor acceleration response of three case study buildings equipped with fluid viscous dampers through nonlinear time-history analysis. The results show that the different design parameters of fluid viscous dampers significantly modify the floor acceleration response, with some damper configurations yielding floor accelerations larger than those of the buildings without dampers
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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