1,720,981 research outputs found
I diritti nell'emergenza
No full textL'articolo evidenzia l'importanza di difendere i diritti fondamentali delle persone, soprattutto nei contesti emergenziali. Dal punto di vista psicologico, la perdita di dignità umana e la sospensione dei diritti che la costituiscono, hanno un grave impatto sulle risorse di resilienza dei soggetti e delle comunità
BIAXIAL CURVATURE AND DUCTILITY CAPACITY OF RC COLUMN BASE CROSS SECTIONS
Get PDFThe deformation performance of the base cross sections of reinforced concrete buildings is
fundamental when large seismic events occur allowing the structure to have large excursions in
nonlinear field and guaranteeing an overall ductile behaviour.
It is well known that the axial force acting on columns significantly reduces the curvature capacity of
the sections and for this reason the technical codes give design criteria stating a limitation in order to
preserve the displacement capacity. It is also recognized that when biaxial bending occur the cross
section undergo a loss in strength capacity. Starting the study of from Bresler (1960), which provided
suitable expression to predict 3D limit interaction surfaces, several numerical and analytical models
were developed to take into account the biaxial interaction in strength.
Simultaneously it is noteworthy to point out that the presence of biaxial bending also influences the
deformation capacity of sections causing in most of the cases a relevant loss of the curvature and
ductility available with respect to the one owned along the principal axes. This important issue is not
faced by technical codes and not exhaustively treated in scientific literature as it was done for strength.
Moreover nonlinear structural models based on lumped plasticity do not take into account these
interaction aspects when defining plastic hinge properties in terms of curvature capacity.
The paper presents a numerical study in which the deformation capacity of RC cross sections
subjected to axial load and biaxial bending is investigated by means of a fiber discretization.
A procedure for the numerical definition of biaxial domains of ultimate curvature, yielding curvature
and curvature ductility is provided and the sensitivity of the biaxial deformation performance to some
geometrical and mechanical parameters (aspect ratio, concrete strength and confinement efficacy) is
discussed.The deformation performance of the base cross sections of reinforced concrete buildings is
fundamental when large seismic events occur allowing the structure to have large excursions in
nonlinear field and guaranteeing an overall ductile behaviour.
It is well known that the axial force acting on columns significantly reduces the curvature capacity of
the sections and for this reason the technical codes give design criteria stating a limitation in order to
preserve the displacement capacity. It is also recognized that when biaxial bending occur the cross
section undergo a loss in strength capacity. Starting the study of from Bresler (1960), which provided
suitable expression to predict 3D limit interaction surfaces, several numerical and analytical models
were developed to take into account the biaxial interaction in strength.
Simultaneously it is noteworthy to point out that the presence of biaxial bending also influences the
deformation capacity of sections causing in most of the cases a relevant loss of the curvature and
ductility available with respect to the one owned along the principal axes. This important issue is not
faced by technical codes and not exhaustively treated in scientific literature as it was done for strength.
Moreover nonlinear structural models based on lumped plasticity do not take into account these
interaction aspects when defining plastic hinge properties in terms of curvature capacity.
The paper presents a numerical study in which the deformation capacity of RC cross sections
subjected to axial load and biaxial bending is investigated by means of a fiber discretization.
A procedure for the numerical definition of biaxial domains of ultimate curvature, yielding curvature
and curvature ductility is provided and the sensitivity of the biaxial deformation performance to some
geometrical and mechanical parameters (aspect ratio, concrete strength and confinement efficacy) is
discussed
Physico-chemical Characterization of Aluminium Oxide Films Grown on Etched Foils for Electrolytic Capacitors
No full textA Strategy for the Prediction of the Response of Hysteretic Systems: A Base for Capacity Assessment of Buildings under Seismic Load
No full textA statistical non linearization method is used to approximate systems modeled by the Bouc differential equation and excited by a Gaussian white noise external load. To this aim restricted potential models (RPM) are used, which are suitable for an extended number of nonlinear problems as have been proved several times. Since the solution of RPM is known by the probabilistic point of view, all statistical characteristics can be derived at once with advantages by the computational point of view. Hence, this paper discusses the possibility to determine sets of parameters characterizing potential models that are valid for describing a hysteretic behavior. In this way the characterization of the hysteretic behavior of a system can be performed with computational efforts lower than that normally requested
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
A Strategy for the Prediction of the Response of Hysteretic Systems: A Base for Capacity Assessment of Buildings under Seismic Load
No full textA statistical non linearization method is used to approximate systems modeled by the Bouc differential equation
and excited by a Gaussian white noise external load. To this aim restricted potential models (RPM) are used, which
are suitable for an extended number of nonlinear problems as have been proved several times. Since the solution of RPM
is known by the probabilistic point of view, all statistical characteristics can be derived at once with advantages by the
computational point of view. Hence, this paper discusses the possibility to determine sets of parameters characterizing potential
models that are valid for describing a hysteretic behavior. In this way the characterization of the hysteretic behavior
of a system can be performed with computational efforts lower than that normally requested
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
BIAXIAL CURVATURE AND DUCTILITY CAPACITY OF RC COLUMN BASE CROSS SECTIONS
No full textThe deformation performance of the base cross sections of reinforced concrete buildings is
fundamental when large seismic events occur allowing the structure to have large excursions in
nonlinear field and guaranteeing an overall ductile behaviour.
It is well known that the axial force acting on columns significantly reduces the curvature capacity of
the sections and for this reason the technical codes give design criteria stating a limitation in order to
preserve the displacement capacity. It is also recognized that when biaxial bending occur the cross
section undergo a loss in strength capacity. Starting the study of from Bresler (1960), which provided
suitable expression to predict 3D limit interaction surfaces, several numerical and analytical models
were developed to take into account the biaxial interaction in strength.
Simultaneously it is noteworthy to point out that the presence of biaxial bending also influences the
deformation capacity of sections causing in most of the cases a relevant loss of the curvature and
ductility available with respect to the one owned along the principal axes. This important issue is not
faced by technical codes and not exhaustively treated in scientific literature as it was done for strength.
Moreover nonlinear structural models based on lumped plasticity do not take into account these
interaction aspects when defining plastic hinge properties in terms of curvature capacity.
The paper presents a numerical study in which the deformation capacity of RC cross sections
subjected to axial load and biaxial bending is investigated by means of a fiber discretization.
A procedure for the numerical definition of biaxial domains of ultimate curvature, yielding curvature
and curvature ductility is provided and the sensitivity of the biaxial deformation performance to some
geometrical and mechanical parameters (aspect ratio, concrete strength and confinement efficacy) is
discussed
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
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