Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil

ilustraciones, diagramas

Autores:
Cordoba Ordoñez, Andres Felipe
Tipo de recurso:
Fecha de publicación:
2023
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
eng
OAI Identifier:
oai:repositorio.unal.edu.co:unal/84859
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/84859
https://repositorio.unal.edu.co/
Palabra clave:
620 - Ingeniería y operaciones afines::624 - Ingeniería civil
Pilotes (Ingeniería civil)
Piling (civil engineering)
Non-uniform cylindrical pile
Tapered Timoshenko beam
Semi-rigid connection
Non-homogeneous soil
Partially embedded pile
Dynamic response
Diferential Transformation Method
Pila cilíndrica no prismática
Viga Timoshenko acartelada
Conexión semirigida
Suelo no homogéneo
Pila parcialmente embebida
Respuesta dinámica
Método de la transformada diferencial
Rights
openAccess
License
Atribución-CompartirIgual 4.0 Internacional
id UNACIONAL2_812103be7037e159313e111bd06ab3c5
oai_identifier_str oai:repositorio.unal.edu.co:unal/84859
network_acronym_str UNACIONAL2
network_name_str Universidad Nacional de Colombia
repository_id_str
dc.title.eng.fl_str_mv Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
dc.title.translated.spa.fl_str_mv Solución analítica para el estudio dinámico de pilotes cilíndricos no uniformes con condiciones de borde generalizadas en suelos elásticos no homogéneos
title Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
spellingShingle Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
620 - Ingeniería y operaciones afines::624 - Ingeniería civil
Pilotes (Ingeniería civil)
Piling (civil engineering)
Non-uniform cylindrical pile
Tapered Timoshenko beam
Semi-rigid connection
Non-homogeneous soil
Partially embedded pile
Dynamic response
Diferential Transformation Method
Pila cilíndrica no prismática
Viga Timoshenko acartelada
Conexión semirigida
Suelo no homogéneo
Pila parcialmente embebida
Respuesta dinámica
Método de la transformada diferencial
title_short Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
title_full Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
title_fullStr Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
title_full_unstemmed Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
title_sort Analytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil
dc.creator.fl_str_mv Cordoba Ordoñez, Andres Felipe
dc.contributor.advisor.none.fl_str_mv Zapata Medina, David Guillermo
Vega Posada, Carlos Alberto
dc.contributor.author.none.fl_str_mv Cordoba Ordoñez, Andres Felipe
dc.contributor.orcid.spa.fl_str_mv Zapata Medina, David Guillermo [0000-0001-8868-8740]
Vega Posada, Carlos Alberto [0000-0002-0923-356X]
dc.contributor.cvlac.spa.fl_str_mv https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0002006127
Cordoba Ordoñez, Andres Felipe [0002006127]
dc.subject.ddc.spa.fl_str_mv 620 - Ingeniería y operaciones afines::624 - Ingeniería civil
topic 620 - Ingeniería y operaciones afines::624 - Ingeniería civil
Pilotes (Ingeniería civil)
Piling (civil engineering)
Non-uniform cylindrical pile
Tapered Timoshenko beam
Semi-rigid connection
Non-homogeneous soil
Partially embedded pile
Dynamic response
Diferential Transformation Method
Pila cilíndrica no prismática
Viga Timoshenko acartelada
Conexión semirigida
Suelo no homogéneo
Pila parcialmente embebida
Respuesta dinámica
Método de la transformada diferencial
dc.subject.lemb.spa.fl_str_mv Pilotes (Ingeniería civil)
dc.subject.lemb.eng.fl_str_mv Piling (civil engineering)
dc.subject.proposal.eng.fl_str_mv Non-uniform cylindrical pile
Tapered Timoshenko beam
Semi-rigid connection
Non-homogeneous soil
Partially embedded pile
Dynamic response
Diferential Transformation Method
dc.subject.proposal.spa.fl_str_mv Pila cilíndrica no prismática
Viga Timoshenko acartelada
Conexión semirigida
Suelo no homogéneo
Pila parcialmente embebida
Respuesta dinámica
Método de la transformada diferencial
description ilustraciones, diagramas
publishDate 2023
dc.date.accessioned.none.fl_str_mv 2023-11-02T14:14:34Z
dc.date.available.none.fl_str_mv 2023-11-02T14:14:34Z
dc.date.issued.none.fl_str_mv 2023-10-04
dc.type.spa.fl_str_mv Trabajo de grado - Maestría
dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/masterThesis
dc.type.version.spa.fl_str_mv info:eu-repo/semantics/acceptedVersion
dc.type.content.spa.fl_str_mv Text
dc.type.redcol.spa.fl_str_mv http://purl.org/redcol/resource_type/TM
status_str acceptedVersion
dc.identifier.uri.none.fl_str_mv https://repositorio.unal.edu.co/handle/unal/84859
dc.identifier.instname.spa.fl_str_mv Universidad Nacional de Colombia
dc.identifier.reponame.spa.fl_str_mv Repositorio Institucional Universidad Nacional de Colombia
dc.identifier.repourl.spa.fl_str_mv https://repositorio.unal.edu.co/
url https://repositorio.unal.edu.co/handle/unal/84859
https://repositorio.unal.edu.co/
identifier_str_mv Universidad Nacional de Colombia
Repositorio Institucional Universidad Nacional de Colombia
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.indexed.spa.fl_str_mv RedCol
LaReferencia
dc.relation.references.spa.fl_str_mv Al-Gahtani, Husain J.: Exact stiffnesses for tapered members. En: Journal of structural Engineering 122 (1996), Nr. 10, p. 1234–1239
Arboleda-Monsalve, Luis G. ; Zapata-Medina, David G. ; Aristizabal-Ochoa, J D.: Timoshenko beam-column with generalized end conditions on elastic foundation: Dynamic-stiffness matrix and load vector. En: Journal of Sound and Vibration 310 (2008), Nr. 4-5, p. 1057–1079
Cheng, Franklin Y.: Vibrations of Timoshenko beams and frameworks. En: Journal of the structural division 96 (1970), Nr. 3, p. 551–571
Cheng, Franklin Y. ; Pantelides, Chris P.: Dynamic Timoshenko beam-columns on elastic media. En: Journal of Structural Engineering 114 (1988), Nr. 7, p. 1524–1550
Hassan, IH Abdel-Halim: Application to differential transformation method for solving systems of differential equations. En: Applied Mathematical Modelling 32 (2008), Nr. 12, p. 2552–2559
Ho, Shing H. ; Chen, Cha’o K.: Analysis of general elastically end restrained non-uniform beams using differential transform. En: Applied Mathematical Modelling 22 (1998), 4, Nr. 4-5, p. 219–234. – ISSN 0307–904X
Jang, Ming-Jyi ; Chen, Chieh-Li: Analysis of the response of a strongly nonlinear damped system using a differential transformation technique. En: Applied Mathematics and Computation 88 (1997), Nr. 2-3, p. 137–151
Karnovsky, IA ; Lebed, OI. Formulas for structural dynamics, 2004
Khan, M K. ; El Naggar, M H. ; Elkasabgy, Mohamed: Compression testing and analysis of drilled concrete tapered piles in cohesive-frictional soil. En: Canadian Geotechnical Journal 45 (2008), Nr. 3, p. 377–392
Lee, Joon K. ; Park, Su H. ; Kim, Youngho: Transverse free vibration of axially loaded tapered friction piles in heterogeneous soil. En: Soil Dynamics and Earthquake Engineering 117 (2019), 02, p. 116–121
Manandhar, Suman ; Yasufuku, Noriyuki ; Omine, Kiyoshi ; Kobayashi, Taizo: Response of tapered piles in cohesionless soil based on model tests. En: Journal of Nepal Geological Society 40 (2010), p. 85–92
Meza Abalo, Maria de los Angeles C.: Analytical solution for the soil-structure intertaction of a non-uniform section pile on non-homogeneous soil conditions, Universidad Nacional de Colombia, Tesis de Grado, 2022
Palacio-Betancur, Alejandro ; Aristizabal-Ochoa, J D.: Statics, stability and vibration of non-prismatic linear beam-columns with semirigid connections on elastic foundation. En: Engineering Structures 181 (2019), p. 89–94
Reese, Lymon C. ; Isenhower, William M. ; Wang, Shin-Tower: Analysis and design of shallow and deep foundations. Vol. 10. John Wiley & Sons, 2005
Robinsky, E I. ; Sagar, W L. ; Morrison, C F.: Effect of Shape and Volume on the Capacity of Model Piles in Sand. En: Canadian Geotechnical Journal 1 (1964), Nr. 4, p. 189–204
Sowers, George B. ; Sowers, George F.: Introductory soil mechanics and foundations. LWW, 1951
Timoˇsenko, Stepan P. ; Gere, James M.: Theory of elastic stability. McGraw-Hill, 1961
Timoshenko, Stephan P.: X. On the transverse vibrations of bars of uniform cross-section. En: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 43 (1922), Nr. 253, p. 125–131
Timoshenko, Stephen P.: LXVI. On the correction for shear of the differential equation for transverse vibrations of prismatic bars. En: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 41 (1921), Nr. 245, p. 744–746
Valsangkar, AJ ; Pradhanang, RB: Free vibration of partially supported piles. En: Journal of engineering mechanics 113 (1987), Nr. 8, p. 1244–1247
Vega-Posada, Carlos A. ; Gallant, Aaron P. ; Areiza-Hurtado, Mauricio: Simple approach for analysis of beam-column elements on homogeneous and non-homogeneous elastic soil. En: Engineering Structures 221 (2020), p. 111110
Zhang, Ling ; Zhao, Minghua ; Zou, Xinjun: Behavior of laterally loaded piles in multilayered soils. En: International Journal of Geomechanics 15 (2015), Nr. 2, p. 06014017
Zhou, J. K.: Differential transformation and its applications for electrical circuits. En: Huarjung Univ. Press. (1986)
Aristizabal-Ochoa, J D.: First-and second-order stiffness matrices and load vector of beam-columns with semirigid connections. En: Journal of Structural Engineering 123 (1997), Nr. 5, p. 669–678
Aristizabal-Ochoa, J D.: Timoshenko beam-column with generalized end conditions and nonclassical modes of vibration of shear beams. En: Journal of engineering mechanics 130 (2004), Nr. 10, p. 1151–1159
Vega-Posada, Carlos A.: Analytical Formulation for the Study of the Effect of Shear Deformations on Beam-Columns and Piles: Engesser and Haringx theories. En: under review and pending approval (2023)
Vega-Posada, Carlos A. ; Gallant, Aaron P. ; Areiza-Hurtado, Mauricio: Simple approach for analysis of beam-column elements on homogeneous and non-homogeneous elastic soil. En: Engineering Structures 221 (2020), p. 111110
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dc.rights.license.spa.fl_str_mv Atribución-CompartirIgual 4.0 Internacional
dc.rights.uri.spa.fl_str_mv http://creativecommons.org/licenses/by-sa/4.0/
dc.rights.accessrights.spa.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-CompartirIgual 4.0 Internacional
http://creativecommons.org/licenses/by-sa/4.0/
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.extent.spa.fl_str_mv xiv, 39 páginas
dc.format.mimetype.spa.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Universidad Nacional de Colombia
dc.publisher.program.spa.fl_str_mv Medellín - Minas - Maestría en Ingeniería - Geotecnia
dc.publisher.faculty.spa.fl_str_mv Facultad de Minas
dc.publisher.place.spa.fl_str_mv Medellín, Colombia
dc.publisher.branch.spa.fl_str_mv Universidad Nacional de Colombia - Sede Medellín
institution Universidad Nacional de Colombia
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spelling Atribución-CompartirIgual 4.0 Internacionalhttp://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Zapata Medina, David Guillermod0cb89e6158ab687ccff97cd4bbcefebVega Posada, Carlos Alberto94a90ba254581fffd887187d3dcea4b3Cordoba Ordoñez, Andres Felipe9fc6bc8ba3d23a1ca9db648005a1a76eZapata Medina, David Guillermo [0000-0001-8868-8740]Vega Posada, Carlos Alberto [0000-0002-0923-356X]https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0002006127Cordoba Ordoñez, Andres Felipe [0002006127]2023-11-02T14:14:34Z2023-11-02T14:14:34Z2023-10-04https://repositorio.unal.edu.co/handle/unal/84859Universidad Nacional de ColombiaRepositorio Institucional Universidad Nacional de Colombiahttps://repositorio.unal.edu.co/ilustraciones, diagramasThis paper presents a simplified analytical method for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soil. The governing differential equation (GDE) of the proposed element is derived in a classical way by using Timoshenko approach and solved using the Differential Transformation Method (DTM). This complex analysis is reduced to solve a system of two linear algebraic equations, which solution is readily available and easy to code. The proposed model represent a general solution capable to solve, just by using a single segment per element, the static, dynamic and stability analyses. The proposed model includes the frequency effects on the stiffness matrix and load vector as well as the coupling effects of: (i) bending and shear deformations along the member; (ii) translational and rotational masses uniformly distributed along its span; (iii) axial load (tension or compression) applied at both ends; (iv) shear forces along the span induced by the applied axial load as the beam deforms according to the “mo dified shear equation” proposed by Timoshenko; (v) generalize boundary condition at the ends of the element (i.e., translational and rotational constraints) and (vi) two-parameter elastic foundations. The dynamic analyses of framed structures can be performed by including the effects of the imposed frequency (ω > 0) on the dynamic-stiffness matrix and load vector while the static and stability analyses can be carried out by making the frequency (ω = 0). Analytical results indicate that the elastic behavior of non-uniform cylindrical piles is frequency dependent and highly sensitive to the coupling effects mentioned above.Este trabajo presenta un método analítico simplificado para el estudio dinámico de pilotes cilíndricos no uniformes con condiciones finales generalizadas en suelos elásticos no homogéneos. La ecuación diferencial gobernante (EDG) del elemento propuesto se deduce de forma clásica utilizando el enfoque de Timoshenko y se resuelve utilizando el Método de Transformación Diferencial (MDT). Este complejo análisis se reduce a la resolución de un sistema de dos ecuaciones algebraicas lineales, cuya solución está fácilmente disponible y es fácil de codificar. El modelo propuesto representa una solución general capaz de resolver, con un solo segmento por elemento, los análisis estático, dinámico y de estabilidad. El modelo propuesto incluye los efectos de la frecuencia en la matriz de rigidez y el vector de carga, así como los efectos de acoplamiento de: (i) deformaciones por flexión y cizalladura a lo largo del elemento; (ii) masas traslacionales y rotacionales distribuidas uniformemente a lo largo de su luz; (iii) carga axial (tracción o compresión) aplicada en ambos extremos; (iv) fuerzas de cizalladura a lo largo de la luz inducidas por la carga axial aplicada a medida que la viga se deforma según la "ecuación de cizalladura modificada" propuesta por Timoshenko; (v) condición de contorno generalizada en los extremos del elemento (es decir, restricciones traslacionales y rotacionales) y (vi) cimientos elásticos de dos parámetros. Los análisis dinámicos de estructuras entramadas pueden realizarse incluyendo los efectos de la frecuencia impuesta (ω > 0) en la matriz de rigidez dinámica y el vector de carga, mientras que los análisis estáticos y de estabilidad pueden llevarse a cabo mediante la aplicación de un algoritmo de cálculo. (Texto tomado de la fuente)MaestríaMagíster en Ingeniería - GeotecniaSoil-Structure InteractionÁrea Curricular de Ingeniería Civilxiv, 39 páginasapplication/pdfengUniversidad Nacional de ColombiaMedellín - Minas - Maestría en Ingeniería - GeotecniaFacultad de MinasMedellín, ColombiaUniversidad Nacional de Colombia - Sede Medellín620 - Ingeniería y operaciones afines::624 - Ingeniería civilPilotes (Ingeniería civil)Piling (civil engineering)Non-uniform cylindrical pileTapered Timoshenko beamSemi-rigid connectionNon-homogeneous soilPartially embedded pileDynamic responseDiferential Transformation MethodPila cilíndrica no prismáticaViga Timoshenko acarteladaConexión semirigidaSuelo no homogéneoPila parcialmente embebidaRespuesta dinámicaMétodo de la transformada diferencialAnalytical solution for the dynamic study of non-uniform cylindrical piles with generalized end conditions in non-homogeneous elastic soilSolución analítica para el estudio dinámico de pilotes cilíndricos no uniformes con condiciones de borde generalizadas en suelos elásticos no homogéneosTrabajo de grado - Maestríainfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/acceptedVersionTexthttp://purl.org/redcol/resource_type/TMRedColLaReferenciaAl-Gahtani, Husain J.: Exact stiffnesses for tapered members. En: Journal of structural Engineering 122 (1996), Nr. 10, p. 1234–1239Arboleda-Monsalve, Luis G. ; Zapata-Medina, David G. ; Aristizabal-Ochoa, J D.: Timoshenko beam-column with generalized end conditions on elastic foundation: Dynamic-stiffness matrix and load vector. En: Journal of Sound and Vibration 310 (2008), Nr. 4-5, p. 1057–1079Cheng, Franklin Y.: Vibrations of Timoshenko beams and frameworks. En: Journal of the structural division 96 (1970), Nr. 3, p. 551–571Cheng, Franklin Y. ; Pantelides, Chris P.: Dynamic Timoshenko beam-columns on elastic media. En: Journal of Structural Engineering 114 (1988), Nr. 7, p. 1524–1550Hassan, IH Abdel-Halim: Application to differential transformation method for solving systems of differential equations. En: Applied Mathematical Modelling 32 (2008), Nr. 12, p. 2552–2559Ho, Shing H. ; Chen, Cha’o K.: Analysis of general elastically end restrained non-uniform beams using differential transform. En: Applied Mathematical Modelling 22 (1998), 4, Nr. 4-5, p. 219–234. – ISSN 0307–904XJang, Ming-Jyi ; Chen, Chieh-Li: Analysis of the response of a strongly nonlinear damped system using a differential transformation technique. En: Applied Mathematics and Computation 88 (1997), Nr. 2-3, p. 137–151Karnovsky, IA ; Lebed, OI. Formulas for structural dynamics, 2004Khan, M K. ; El Naggar, M H. ; Elkasabgy, Mohamed: Compression testing and analysis of drilled concrete tapered piles in cohesive-frictional soil. En: Canadian Geotechnical Journal 45 (2008), Nr. 3, p. 377–392Lee, Joon K. ; Park, Su H. ; Kim, Youngho: Transverse free vibration of axially loaded tapered friction piles in heterogeneous soil. En: Soil Dynamics and Earthquake Engineering 117 (2019), 02, p. 116–121Manandhar, Suman ; Yasufuku, Noriyuki ; Omine, Kiyoshi ; Kobayashi, Taizo: Response of tapered piles in cohesionless soil based on model tests. En: Journal of Nepal Geological Society 40 (2010), p. 85–92Meza Abalo, Maria de los Angeles C.: Analytical solution for the soil-structure intertaction of a non-uniform section pile on non-homogeneous soil conditions, Universidad Nacional de Colombia, Tesis de Grado, 2022Palacio-Betancur, Alejandro ; Aristizabal-Ochoa, J D.: Statics, stability and vibration of non-prismatic linear beam-columns with semirigid connections on elastic foundation. En: Engineering Structures 181 (2019), p. 89–94Reese, Lymon C. ; Isenhower, William M. ; Wang, Shin-Tower: Analysis and design of shallow and deep foundations. Vol. 10. John Wiley & Sons, 2005Robinsky, E I. ; Sagar, W L. ; Morrison, C F.: Effect of Shape and Volume on the Capacity of Model Piles in Sand. En: Canadian Geotechnical Journal 1 (1964), Nr. 4, p. 189–204Sowers, George B. ; Sowers, George F.: Introductory soil mechanics and foundations. LWW, 1951Timoˇsenko, Stepan P. ; Gere, James M.: Theory of elastic stability. McGraw-Hill, 1961Timoshenko, Stephan P.: X. On the transverse vibrations of bars of uniform cross-section. En: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 43 (1922), Nr. 253, p. 125–131Timoshenko, Stephen P.: LXVI. On the correction for shear of the differential equation for transverse vibrations of prismatic bars. En: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 41 (1921), Nr. 245, p. 744–746Valsangkar, AJ ; Pradhanang, RB: Free vibration of partially supported piles. En: Journal of engineering mechanics 113 (1987), Nr. 8, p. 1244–1247Vega-Posada, Carlos A. ; Gallant, Aaron P. ; Areiza-Hurtado, Mauricio: Simple approach for analysis of beam-column elements on homogeneous and non-homogeneous elastic soil. En: Engineering Structures 221 (2020), p. 111110Zhang, Ling ; Zhao, Minghua ; Zou, Xinjun: Behavior of laterally loaded piles in multilayered soils. En: International Journal of Geomechanics 15 (2015), Nr. 2, p. 06014017Zhou, J. K.: Differential transformation and its applications for electrical circuits. En: Huarjung Univ. Press. (1986)Aristizabal-Ochoa, J D.: First-and second-order stiffness matrices and load vector of beam-columns with semirigid connections. En: Journal of Structural Engineering 123 (1997), Nr. 5, p. 669–678Aristizabal-Ochoa, J D.: Timoshenko beam-column with generalized end conditions and nonclassical modes of vibration of shear beams. En: Journal of engineering mechanics 130 (2004), Nr. 10, p. 1151–1159Vega-Posada, Carlos A.: Analytical Formulation for the Study of the Effect of Shear Deformations on Beam-Columns and Piles: Engesser and Haringx theories. En: under review and pending approval (2023)Vega-Posada, Carlos A. ; Gallant, Aaron P. ; Areiza-Hurtado, Mauricio: Simple approach for analysis of beam-column elements on homogeneous and non-homogeneous elastic soil. En: Engineering Structures 221 (2020), p. 111110EstudiantesInvestigadoresMaestrosPúblico generalLICENSElicense.txtlicense.txttext/plain; charset=utf-85879https://repositorio.unal.edu.co/bitstream/unal/84859/3/license.txteb34b1cf90b7e1103fc9dfd26be24b4aMD53ORIGINAL1152214869.2023.pdf1152214869.2023.pdfTesis de Maestría en Ingeniería - Geotecniaapplication/pdf7597862https://repositorio.unal.edu.co/bitstream/unal/84859/4/1152214869.2023.pdf54dcf77d94c91d514e5356c2264bbd03MD54THUMBNAIL1152214869.2023.pdf.jpg1152214869.2023.pdf.jpgGenerated Thumbnailimage/jpeg5006https://repositorio.unal.edu.co/bitstream/unal/84859/5/1152214869.2023.pdf.jpg2f050bf0889862360256a8f1862700c3MD55unal/84859oai:repositorio.unal.edu.co:unal/848592024-08-19 23:10:25.696Repositorio Institucional Universidad Nacional de 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