1,720,966 research outputs found
A novel shell element for nonlinear pushover analysis of reinforced concrete shear walls
No full textWe present a procedure for the assessment of reinforced concrete structures in terms of seismic capacity based on the nonlinear pushover method. Structural systems containing shear walls are dealt with by adopting a newly developed reinforced shell element in which arbitrary distributions of steel reinforcement and nonlinear material behavior for both concrete and re-bars are considered. Stand-alone structural walls and a full-scale 3D building with shear walls placed along two directions are analyzed. Numerical simulations are presented that demonstrate the capabilities of the proposed approach in obtaining limit loads and failure mechanisms at an affordable computational cost
A regularized interface model for simulating the response of adhesive joints
No full textA regularized interface damage model is presented grounded on the cohesive-zone concept. This is obtained using a gradient-based formulation, which is equivalent to the introduction of the laplacian of a scalar damage field into the threshold function of the corresponding local model. Unlike the classical cohesive-zone formulations, damage is driven by a non-local energy release rate and the size of the process zone is controlled by an independent model parameter. The capabilities of the proposed approach are shown via a mode-I fracture problem for an adhesive joint. Numerical results illustrate the effects of the gradient dependence against the usual cohesive zone implementation
Comparison between a direct and a regularized method for brittle crack path modeling
No full textWe present a comparison between a global energy approach à la Griffith and a regularized model named graded damage for the simulation of brittle and quasi-brittle fracture. In the Griffith-like approach the crack propagation criterion stems from stationarity of the total free energy resulting from the sum of the bulk elastic energy and the surface energy required for crack advancement. On the other side, in graded damage the material degradation takes place in layers of finite thickness where the transition between the sound material and the completely damaged one occurs. A numerical example that refers to a typical benchmark problem is presented that allows showing the features of the two approaches and their ability to reproduce experimental results as well
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
Graded damage: a different view of the Thick Level Set approach
No full textIn this work we formulate a damage model by prescribing a free energy density and a dissipation potential to get the Graded damage model [2]. This is obtained by augmenting the potential energy via two scalar constraints: the first one prescribes the classical [0, 1] bounds for the damage variable whereas the second one provides the bounds for the spatial gradient of damage
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
- …
