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1
artículo
The purpose of this paper is to study the vibrational behavior of advanced composite plates by using a novel first shear deformation theory (FSDT). This theory contains only four unknowns, with is even less than the classical FSDT. The governing equations are derived by employing the Hamilton's principles and solved via Navier's solution. The present results were validiated by comparing it with the 3D, classical FSDT and other solutions available in the literature. Shear correction factor apper to be unfovarable in some cases (case dependent). Finally, authors recommend further study of this new manner to model the displacement field.
2
artículo
Publicado 2016
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This paper presents a static analysis of functionally graded single and sandwich beams by using an efficient 7DOFs quasi-3D hybrid type theory. The governing equations are derived by employing the principle of virtual works in a weak form and solved by means of the Finite Element Method (FEM). A C1 cubic Hermite interpolation is used for the vertical deflection variables while C0 linear interpolation is employed for the other kinematics variables. Convergence rates are studied in order to validate the finite element technique. Numerical results of the present formulation are compared with analytical and FEM solutions available in the literature.
3
artículo
Publicado 2015
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The closed-form solution of a generalized hybrid type quasi-3D higher order shear deformation theory (HSDT) for the bending analysis of functionally graded shells is presented. From the generalized quasi-3D HSDT (which involves the shear strain functions “f(ζ)” and “g(ζ)” and therefore their parameters to be selected “m” and “n”, respectively), infinite six unknowns' hybrid shear deformation theories with thickness stretching effect included, can be derived and solved in a closed-from. The generalized governing equations are also “m” and “n” parameter dependent. Navier-type closed-form solution is obtained for functionally graded shells subjected to transverse load for simply supported boundary conditions. Numerical results of new optimized hybrid type quasi-3D HSDTs are compared with the first order shear deformation theory (FSDT), and other quasi-3D HSDTs. The...
4
artículo
Publicado 2023
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Purpose: This study estimated total import demand elasticities concerning income, import prices and domestic prices. A high propensity to import constitutes a significant obstacle to economic growth in Mexico since the benefits of increased exports or any other aggregate demand expansion leak to the rest of the world. Design/methodology/approach: This paper estimated a Vector Error Correction Model of the total import demand elasticities concerning income, import prices and domestic prices. Total imports are a dependent variable, while Gross Domestic Product (GDP) and import and domestic prices are the independent variables. Findings: The principal finding is that an increase of 1 peso in the Mexican GDP leads to a rise of 0.50 pesos in Mexican imports; the elasticity of import demand for prices is low. Still, the elasticity of import demand for domestic prices is 2.14 times greater than...
5
artículo
Publicado 2022
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Compressive strength and elasticity modulus are the main mechanical properties of concrete. The non-destructive ultrasound pulse test can be used to determine these properties without compromising the structure’s integrity. This study seeks to assess whether a correlation exists (1) between the Reinforcement Index (RI) and the mechanical properties, (2) between the RI and the dynamic properties, and (3) among the dynamic properties of polypropylene fiber-reinforced concrete. The RI was modified through fiber volume fraction (0, 0.4, 0.8 and 1.2%) and fiber length (40, 50 and 60 mm). The dynamic properties were assessed through dynamic elasticity modulus and ultrasonic pulse velocity (UPV), which were determined by direct, semi-direct, and indirect prospect methods. Finally, compressive strength, static elasticity modulus, and Poisson’s ratio were assessed through destructive tests. T...
6
artículo
Publicado 2021
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This paper was written in the context of the project: “Desarrollo de materiales avanzados para el diseño de nuevos productos y servicios tecnológicos para la minería Peruana” founded by CONCYTEC (FONDECYT and GRUPO BANCO MUNDIAL) under the contract number N° 032-2019-FONDECYT-BM-INC.INV. The authors of this manuscript appreciate the financial support from the Peruvian Government.
7
artículo
This paper presents a static analysis of functionally graded (FG) single and sandwich beams by using a simple and efficient 4-unknown quasi-3D hybrid type theory, which includes both shear deformation and thickness stretching effects. The governing equations and boundary conditions are derived by employing the principle of virtual works. Navier-type closed-form solution is obtained for several beams. New hybrid type shear strain shape functions for the inplane and transverse displacement were introduced in general manner to model the displacement field of beams. Numerical results of the present compact quasi-3D theory are compared with other quasi-3D higher order shear deformation theories (HSDTs).
8
artículo
Nonlinear complementarity and mixed complementarity problems arise in mathematical models describing several applications in Engineering, Economics and different branches of physics. Previously, robust and efficient feasible directions interior point algorithm was presented for nonlinear complementarity problems. In this paper, it is extended to mixed nonlinear complementarity problems. At each iteration, the algorithm finds a feasible direction with respect to the region defined by the inequality conditions, which is also monotonic descent direction for the potential function. Then, an approximate line search along this direction is performed in order to define the next iteration. Global and asymptotic convergence for the algorithm is investigated. The proposed algorithm is tested on several benchmark problems. The results are in good agreement with the asymptotic analysis. Finally, the...
9
tesis doctoral
Publicado 2017
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This work investigates the Feasible Direction Algorithm using interior points applied to the Mixed Nonlinear Complementarity Problem and some applications. This algorithm is based in Feasible Directions Algorithm for Nonlinear Complementarity Problem, which is described briefly. The proposed algorithm is important because many mathematical models can be written as mixed nonlinear complementarity problem. The principal idea of this algorithm is to generate, at each iteration, a sequence of feasible directions with respect to the region, defined by the inequality conditions, which are also monotonic descent directions for one potential function. Then, an approximate line search along this direction is performed in order to define the next iteration. Global and asymptotic convergence properties for the algorithm are proved. In order to validade the robustness the algorithm is tested on seve...
10
tesis de grado
El diseño estructural en sección compuesta ha tomado gran importancia a nivel ingenieril, gracias a las ventajas de usar diferentes materiales para crear un elemento con propiedades mejoradas. En relación a este gran avance, el campo de diseño se ha visto en la obligación de crear normas o reglamentos que tomen en cuenta el correcto funcionamiento de dicho sistema. Por ello, el diseño se debe regir en principios o filosofías que brinden la seguridad; uno de los principales principios es el estado límite de servicio, cuyo principio es asegurar el correcto desempeño estructural tanto la funcionabilidad como la seguridad. A través de los años, el comportamiento, en dicho estado, es asumido en rango elástico, ya que se diseña con la suposición de que los elementos trabajan elásticamente y en consecuencia sus respuestas estructurales también. Por tal motivo, las respuestas est...
11
tesis de grado
En la presenta tesis se desarrolla el modelamiento numérico de un muro de suelo reforzado con cintas poliméricas, con el objetivo de determinar los esfuerzos y deformaciones por medio del método de elementos finitos, así como también el análisis de estabilidad por el método de equilibrio límite y reducción paramétrica; dicho muro sirve para plataforma de acceso vehicular. Para modelar el suelo por medio de la técnica de elementos finitos se utilizan los modelos constitutivos de Mohr Coulomb y Hardening Soil, implementados en el software PLAXIS, asimismo se han determinado los esfuerzos y deformaciones en condición estática en el suelo, y elementos de refuerzo del muro. Los parámetros del modelo constitutivo provienen de ensayos y estimaciones geotécnicas. El muro analizado está reforzado con cintas poliméricas y el paramento frontal es de paneles de concreto. El muro tie...
12
tesis doctoral
Publicado 2017
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This work investigates the Feasible Direction Algorithm using interior points applied to the Mixed Nonlinear Complementarity Problem and some applications. This algorithm is based in Feasible Directions Algorithm for Nonlinear Complementarity Problem, which is described briefly. The proposed algorithm is important because many mathematical models can be written as mixed nonlinear complementarity problem. The principal idea of this algorithm is to generate, at each iteration, a sequence of feasible directions with respect to the region, defined by the inequality conditions, which are also monotonic descent directions for one potential function. Then, an approximate line search along this direction is performed in order to define the next iteration. Global and asymptotic convergence properties for the algorithm are proved. In order to validade the robustness the algorithm is tested on seve...
13
tesis de grado
Publicado 2020
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La presente investigación está orientada a realizar un análisis comparativo en la estimación de la capacidad portante usando 4 ecuaciones de cálculo para diseño de Cimentaciones Superficiales y un ensayo SPT, dichas ecuaciones pertenecen a: “Terzagui, Meyerhof, Hansen y Vesic” siendo utilizadas en la actualidad en nuestro medio local. En la elaboración de esta tesis, se realizaron excavaciones a cielo abierto (calicatas) aleatoriamente y de los cuales se extrajeron muestras para realizarles las pruebas en laboratorio de suelo, dichas muestras de suelo pertenecen de la zona de Tambocancha, distrito de Chinchero, de la provincia de Urubamba, departamento de Cusco, los ensayos que se realizaron fueron tanto de caracterización como de resistencia al corte. Para el desarrollo de los diversos ensayos se trabajó en el laboratorio de suelos de la Universidad Andina del Cusco. Se rea...
14
tesis doctoral
Publicado 2017
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En la presente tesis se han introducido y estudiado nuevas nociones de función co-radiante de valor real extendido y de valor conjunto, definidas en un cono de un espacio euclídeo. El estudio exhaustivo que se hace de ellas ha permitido hacer contribuciones en el análisis multivaluado no convexo, así como disponer de herramientas matemáticas adecuadas para analizar con un nivel de generalidad superior, las tradicionales funciones de producción que en la teoría económica se las denomina funciones de rendimientos decrecientes a escala. Se proponen las funciones alfa-co-radiantes que incluyen funciones como las de Cobb-Douglas de grado alfa y las de elasticidad de sustitución constante. Asimismo, se presentan representaciones convexas de las funciones alfa co-radiantes y se hacen algunos aportes para las funciones cóncavas y homogéneas de grado alfa. Los resultados de mayor relev...
15
tesis de grado
Publicado 2022
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En el presente trabajo de investigación se llevaron a cabo análisis paramétricos comparativos, en materia de comportamiento sísmico, para evaluar la incidencia que tiene la incorporación de Vigas Acarteladas de Sección Cónica dentro de los sistemas estructurales convencionales Aporticado y Dual en concreto armado dispuestos por la norma peruana E.030 (2020). Estudio que tuvo como excusa de probeta, una edificación multinivel de ocho plantas con fines de vivienda, ubicada en la ciudad del Cusco y denominada “Residencial Kala”. Para lo cual, 90 diferentes casos de prueba hipotéticos fueron inscritos, en los cuales la estructuración de cada propuesta de diferenciaba por si 1) los perfiles de acartelamiento de sus vigas fuesen Circulares, Elípticas o Parabólicas; 2) los peraltes de acartelamiento de estas; 3) las localizaciones que tuvieran dentro del sistema; y 4) la existen...
16
artículo
Publicado 2017
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Polymeric nanocomposites with graphene were obtained by semicontinuous heterogeneous polymerization in situ. Its mechanical properties were determined in the films formed with different concentrations of graphene. The process of obtaining the nanocomposites consisted of two stages: In the first stage the graphene was synthesized by the modified Hummer method. The second stage consisted of the dosing of styrene (St), butyl acrylate (AB) and allyl methacrylate (ALMA); at a flow rate of 0.5 mL / min, on the graphene dispersion obtained in the first stage. The characterization of the polymer films were done by means of mechanical tests, average particle diameter by dynamic Light Scattering (DLS) technique, and the qualitative analysis of functional groups was carried out by infrared spectroscopy. According to the results obtained, the latexes synthesized had a final conversion greater than 8...
17
tesis de maestría
Publicado 2019
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La estimación de funciones de vulnerabilidad se obtuvo mediante la estimación del costo medio y desviación estándar debido a daño sísmico producido por una cierta intensidad de evento sísmico, para una tipología estructural específica que caracterizan la incertidumbre del costo de daño desde el punto de vista probabilístico dado una intensidad sísmica que se asume aleatoria. El daño y su estimación se evaluaron para los elementos estructurales (columnas, vigas, losas aligeradas, placas etc.) y los no estructurales (tabiques, equipos, tuberías, instalaciones, vidrios, etc.). También se incluye los costos derivados de las pérdidas parciales o totales de funcionalidad del sistema estructural. Las curvas de vulnerabilidad son utilizadas como parte del análisis de riesgo sísmico que comprende las siguientes etapas: •Análisis del peligro sísmico •Análisis de la exposi...
18
artículo
Publicado 2017
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The demand for long and short term real balances for Peru is theoretically consistent and empirically robust using the seasonal cointegration methodology. The stability of this function is of paramount importance for the management of monetary policy. The study uses quarterly data for the period from the fourth quarter of 1991 to the first quarter of 2014; considers a demand for money based on a scale variable representative of the income of the economy, interest rate in national currency and nominal exchange rate. The coefficients of income elasticity, interest rate and exchange rate vary in sign and magnitude depending on the theory. The long-term model and the mechanism of error correction using the short-term models exceed statistical tests, whereas the chow and cusum squared tests explain that the demand for money is a stable function. The exogeneity analysis of the regressors shows...
19
artículo
Publicado 2017
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The demand for long and short term real balances for Peru is theoretically consistent and empirically robust using the seasonal cointegration methodology. The stability of this function is of paramount importance for the management of monetary policy. The study uses quarterly data for the period from the fourth quarter of 1991 to the first quarter of 2014; considers a demand for money based on a scale variable representative of the income of the economy, interest rate in national currency and nominal exchange rate. The coefficients of income elasticity, interest rate and exchange rate vary in sign and magnitude depending on the theory. The long-term model and the mechanism of error correction using the short-term models exceed statistical tests, whereas the chow and cusum squared tests explain that the demand for money is a stable function. The exogeneity analysis of the regressors shows...
20
artículo
Publicado 2017
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The demand for long and short term real balances for Peru is theoretically consistent and empirically robust using the seasonal cointegration methodology. The stability of this function is of paramount importance for the management of monetary policy. The study uses quarterly data for the period from the fourth quarter of 1991 to the first quarter of 2014; considers a demand for money based on a scale variable representative of the income of the economy, interest rate in national currency and nominal exchange rate. The coefficients of income elasticity, interest rate and exchange rate vary in sign and magnitude depending on the theory. The long-term model and the mechanism of error correction using the short-term models exceed statistical tests, whereas the chow and cusum squared tests explain that the demand for money is a stable function. The exogeneity analysis of the regressors shows...
