Wilson Rodriguez - Academia.edu (original) (raw)

Papers by Wilson Rodriguez

DYNA

An educational computational application for analyzing plane stress problems oriented to engineer... more An educational computational application for analyzing plane stress problems oriented to engineering students called EsfPlano2D is presented to motivate students to study the subject and strengthen didactic strategies in the classroom. The application assists the step-by-step calculation of plane stress problems, which is a fundamental topic in teaching the subject of Mechanics of Materials in engineering careers. The application is a computer program developed in Fortran, linked to the free Computer Algebra System MAXIMA to plot Mohr’s circle of stresses. The developed tool is user-friendly and completely solves the plane stress problem, the associated deformations, and the strain energy by drawing Mohr’s circle of plane stresses. A validation case is presented with a typical example of the mechanics of materials. The results show the feasibility of using custom-designed tools to strengthen classroom learning and autonomous work.

Asian Research Publishing Network (ARPN), 2018

Asian Research Publishing Network (ARPN), 2020

Revista Ingenieria E Investigacion, Sep 1, 2006

Diseño de un Diseño de un software software educativo para el análisis de educativo para el análi... more Diseño de un Diseño de un software software educativo para el análisis de educativo para el análisis de sistemas hidráulicos a presión en ingeniería civil sistemas hidráulicos a presión en ingeniería civil

Review, analysis and comparison of explicit and implicit methods of recent development (2009-2015... more Review, analysis and comparison of explicit and implicit methods of recent development (2009-2015) for the calculation of normal depth in rectangular channels are performed; an adaptation of Newton Raphson method is developed as an alternative calculation of the problem and formulate a new method (called non-orthogonal directions NOD) is presented, this method is based on the modification of the fixed-point iteration method which is recognized for being simple but divergent with application limitations and restrictions. The proposed method determines the start value for the normal depth wisely, its formulation is simple, it has fast convergence and low computational cost that make it competitive with recognized and widely used methods (for example, Newton Raphson) as evidenced by the findings. Keywords: fixed-point iteration method, newton raphson method, non-orthogonal directions method, normal depth.

Numerical modeling of impact problem using elastic and elastoplastic constitutive models and open... more Numerical modeling of impact problem using elastic and elastoplastic constitutive models and open source software is presented. The first case is an elastoplastic model for the analysis of a cylindrical aluminum element that impacts on a rigid surface; the second case, is an impact model of a body on the center of simply supported aluminum beam introducing elastic and elastoplastic constitutive models. This work is originated from the need to explore some possibilities of impact phenomenon modeling. The main contributions were: establish the importance of the constitutive models in modeling the impact phenomenon, accessing to explicit dynamic models of impact with Open Source Software like “Impact” Finite Element Program and explore possibilities of parallel computing and multi-platform as this software is developed in Java and offers possibilities for using several processors in parallel. Some results were compared with

DYNA, 2015

The model developed tries to predict the stresses and strains of the structure of the pavement in... more The model developed tries to predict the stresses and strains of the structure of the pavement in a more real way, doing a lineal elastic structural analysis in three dimensions with capacity to model loads of double axes, that which constitutes an advance regarding twodimensional axisymmetrical models that only represent the state tense-deformational of the pavement under loads of simple axes. Earlier stages of this research showed two-dimensional models under different load scenarios, league between layers and nonlinear constitutive models, however the purpose is to move towards analysis methodology stress-strain state under standard loads. The model was implemented in the Algor  program and a comparison with the Elsym5 multilayer freeware was performed. The results warn the existence of shear stress concentrations that can be causing major flaws that are not considered in traditional design methods which could lead to the possibility of reassessed.

Revista Ingeniería de Construcción, Nov 5, 2011

Modelo de competencias para supervisores de obra Resumen En este documento se expone el análisis ... more Modelo de competencias para supervisores de obra Resumen En este documento se expone el análisis por confiabilidad estructural basado en instrumentación del puente Puerto Salgar, considerado uno de las obras viales más importantes de Colombia. Dicho trabajo incluyó: levantamiento geométrico, ensayos mecánicos, conteo del tráfico, prueba de carga, optimización y calibración del modelo estructural, instrumentación, monitoreo y simulación numérica. Basados en la confiabilidad estructural, se encontraron probabilidades de falla en algunos elementos principales de este puente, que no están dentro del rango de seguridad que garantice su estabilidad total. Además se detectaron sobrecargas importantes sobre algunos elementos del puente, que afectan su seguridad y que deben ser objeto de control por parte de la entidad responsable. Por otro lado se encontró prioritario hacer la revisión de la carga de diseño de puentes, especificada por el código Colombiano, ya que genera solicitaciones internas menores a las reales medidas en campo. Finalmente en este proyecto se demuestra las utilidades y ventajas, de emplear el método de confiabilidad estructural apoyada en instrumentación, para la revisión de puentes existentes en acero.

This article presents an analysis by structural reliability based on instrumentation applied to t... more This article presents an analysis by structural reliability based on instrumentation applied to the bridge Puerto Salgar, considered one of most important of Colombia. This work included: surveying, mechanical testing, traffic counting, load test, optimization and calibration of the structural model, instrumentation, monitoring and numerical simulations. Based on the structural reliability analysis, there were probabilities of failure in some main elements of this bridge since they were not within the safety range that guarantees stability. In addition, important overloads were detected on some elements of the bridge which must be taken care of by the responsible organization since they affect the bridge safety. Additionally, it is recommended the review of Colombian code design loads for bridges since it assumes lower stresses than those measured on the field. Finally, this project showed the advantages of using method of structural reliability based on instrumentation for the revi...

Revista Ingenieria De Construccion, May 11, 2011

redalyc.uaemex.mx

Rodríguez Calderón, Wilson;Pallares Muñoz, Myriam Rocío Calibración de modelos de elementos finit... more Rodríguez Calderón, Wilson;Pallares Muñoz, Myriam Rocío Calibración de modelos de elementos finitos de muros de adobe por optimización Ingeniería e Investigación, Vol. 29, Núm. 2, agosto-sin mes, 2009, pp. 10-19 Universidad Nacional de Colombia Colombia

Ingeniería e Investigación, 2009

This paper presents a proposal for applying optimisation schemes to calibrating 3D linear and non... more This paper presents a proposal for applying optimisation schemes to calibrating 3D linear and non-linear finite element models for analysing structural walls made out of adobe. The calibration was based on laboratory data and that from previous research. Simulation and calibration involves a deep study of the conceptual model of adobe's structural behaviour, mathematical and nu- merical models and the interrelationship with optimisation schemes arising from minimising an objective function. This is defined in terms of design variables and is restricted by the values of state variables. Both were obtained from the finite element model developed at ANSYS. The optimisation scheme with which the model was automatically calibrated required a macro to be pro- grammed using an APDL language package. This research was aimed at implementing nonlinear computational models for the structural analysis of walls based on experimental data; this provided a tool for assessing the behaviour of a...

Ingeniería e Investigación, 2007

El golpe de ariete puede generar consecuencias severas en la integridad de las tuberías, y debido... more El golpe de ariete puede generar consecuencias severas en la integridad de las tuberías, y debido a ello, la si-mulación es un requisito esencial para asegurar el correcto diseño y operación de los sistemas de distribución de agua. En este sentido, el artículo pretende demostrar la importancia de los métodos numéricos en la resolución de este tipo de problemas. Para la simulación numérica del fenómeno se desarrolló un código en Scilab3 que permite representar la propagación de las ondas de presión haciendo uso del método de las características, aplicado a un caso clásico de la literatura. Este método emplea un esquema de diferencias finitas para resolver las ecuaciones de masa y momento. En el artículo se presentan las ecuaciones que gobiernan el problema desde el punto de vista numérico, se analiza el comportamiento del fenómeno y finalmente, se realiza una comparación entre los resultados obtenidos por la vía numérica y la solución teórica.

Ingeniería y Región

En los problemas clásicos de flujo en tuberías se presentan dos situaciones típicas en las que el... more En los problemas clásicos de flujo en tuberías se presentan dos situaciones típicas en las que el analista busca determinar el caudal (Q) o el diámetro de diseño (F); estos han sido tradicionalmente resueltos mediante procesos iterativos sobre el factor de fricción (D) tratando de hallar una variable que no es propiamente la incógnita principal del problema, con el ánimo aparente de facilitar la solución y sacar del paso los cálculos en derivadas que implica una solución más real. En este artículo, se presenta una propuesta de una nueva formulación para este problema basada en una fundamentación numérica que encuentra directamente las variables de interés, adaptando matemática y computacionalmente el método de Newton Raphson el cual converge rápidamente a la solución deseada. Se desarrolló una aplicación educativa en Java, mediante su IDE Netbeans. Los resultados encontrados llaman la atención de la forma como tradicionalmente se enseña a resolver los problemas de flujo en tuberías ...

Las estructuras formadas por elementos lineales articulados constituyen una tipologia importante ... more Las estructuras formadas por elementos lineales articulados constituyen una tipologia importante de los sistemas estructurales que se utilizan en ingenieria y por ello resultan un campo muy Interesante para la aplicacion de metodos de optimizacion. La optimizacion en estas estructuras se refiere a las dimensiones de las secciones transversales de la barras y a la posicion de los nudos, teniendo en cuenta las restricciones que el pandeo introduce sobre las barras solicitadas a compresion que se traducen en limites de tamano de las secciones transversales para evitar la disminucion de capacidad resistente. En este articulo se determinan secciones optimizadas de elementos articulados identificando la funcion objetivo a minimizar, las variables de diseno y las restricciones del problema. Se reportan dos casos de estudio de peso minimo: una celosia y una armadura de puente, ambos con restricciones de esfuerzos admisibles. Se realiza una validacion comparando los resultados de modelos de ...

In this study, we evaluated the performance of the granular sub-base materials of the “La Caima” ... more In this study, we evaluated the performance of the granular sub-base materials of the “La Caima” and “Martínez” quarries located in Ibagué, Colombia, using resistance maps validated with the traditional data of optimum moisture content, maximum dry unit weight and CBR. From the results of resistance maps made for the two quarries using the Grapher software we concluded that the maximum value of CBR could be obtained with moisture values lower than the optimum moisture content. We conclude that a moisture value lower than the optimum moisture content (obtained from the Proctor test) produces higher values of CBR, for example, in the “La Caima” and “Martínez” quarries a higher CBR value is obtained when the optimum moisture content is reduced by 0.5%. In first case, CBR value increases 31.61% and the second case 24.46%. The results obtained from the two case studies indicate that the development of resistance maps is the most appropriate methodology to achieve a better compaction cont...