Examinando por Autor "Gomez J."
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Ítem Finite element modeling of micropolar-based phononic crystals(Elsevier BV, 2019-11-11) Guarín-Zapata N.; Gomez J.; Valencia C.; Dargush G.F.; Hadjesfandiari A.R.; Mecánica AplicadaThe performance of a Cosserat/micropolar solid as a numerical vehicle to represent dispersive media is explored. The study is conducted using the finite element method with emphasis on Hermiticity, positive definiteness, principle of virtual work and Bloch–Floquet boundary conditions. The periodic boundary conditions are given for both translational and rotational degrees of freedom and for the associated force- and couple-traction vectors. Results in terms of band structures for different material cells and mechanical parameters are provided. © 2019 Elsevier B.V.Ítem A General-Purpose Element-Based Approach to Compute Dispersion Relations in Periodic Materials with Existing Finite Element Codes(World Scientific Publishing Co. Pte Ltd, 2019-01-01) Valencia C.; Gomez J.; Guarín-Zapata N.; Mecánica AplicadaThe numerical determination of dispersion relations in periodic materials via the finite element method is a difficult task in most standard codes. Here, we propose a novel technique which allows the computation of these band structures from local elemental subroutines in contrast with existing methods which impose Bloch boundary conditions on the global arrays. The proposed local approach is thus readily applicable to several physical contexts and space dimensionalities. Here we present the details of this element-based algorithm and provide verification results for three different kinematic assumptions applied to phononic crystals in a classical and a micropolar elastic medium. The paper also includes in the form of supplementary material, a fully-coded user subroutine and a test-problem to be used in a commercial finite element code. © 2019 IMACS.Ítem Integrating computation into a civil engineering curriculum instructions at a colombian higher education institution(Research in Engineering Education Network, 2019-01-01) Vieira C.; Gomez J.; Vieira C.; Gomez J.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica AplicadaThis paper presents a work in progress to integrate computation across the civil engineering curriculum at a Colombian University. Engineering programs all around the world have started to realize the value of preparing the future professionals with the knowledge and skills to solve complex problems using computational tools and methods such as modeling and simulation. The paper describes the challenges the institution is facing with these courses, propose an instructional approach to support student learning, and presents a preliminary data analysis for the adaptation of an instrument that will allow to assess students'self-beliefs about computing in the context of this curricular innovation. Copyright © 2019 Camilo Vieira and Juan Gomez.Ítem Site specific analysis using topography conditioned response spectra(Elsevier Ltd, 2019-01-01) Sáenz M.; Sierra C.; Vergara J.; Jaramillo J.; Gomez J.; Mecánica AplicadaWe address topographic effects in site response analysis. By splitting a generalized surface topography into simple geometric elements we identify fundamental concepts that control the dynamic response. We show that in the construction of a model for a particular topographic scenario the geometric details that must mandatory be retained into the model depend upon the expected period range of interest in the response spectra. We refer to this limited spectra as a topography conditioned response spectra. To fully test the newly introduced idea, we conducted extensive parametric analysis of the previously identified fundamental elements and generate a proxy to relate a lower bound of the target structural period to the maximum dimensionless frequency required in the model. This dimensionless frequency indicates accurately what elements of the profile can be eliminated as these are irrelevant for the spectral response. The proposed analysis technique is further explained using as case of study the topographic scenario corresponding to the Aburrá Valley region in Medellín, Colombia. Our results show that with relatively simple models we can predict accurately the spectral response up to the prescribed target period. © 2019 Elsevier Ltd