Browsing by Autor "Bernardo Caicedo"

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Análisis del ensayo CBR desde un punto de vista geotécnico
(2016) Cristhian Mendoza; Bernardo Caicedo
Cálculo en esfuerzos efectivos de obras subterráneas, aplicación al caso del túnel de Chingaza
(Universidad de Los Andes, 1999) Bernardo Caicedo
This paper presents a numerical model for the analysis of underground structures under effective stresses. The problem is addressed by using a threelineal behaviour law with a progressive strength reduction. The system of equations is solved using the finite differences. First of all the model is presented, then, a few applications to the computation of long term strain of Tunnels and satability of water conduction tunnels in rapid dawdown conditions.
Centrifuge modeling of soil atmosphere interaction using climatic chamber
(Centre National de la Recherche Scientifique, 2010) Bernardo Caicedo; Julián Tristancho; Luc Thorel
Soil-atmospheric interaction processes such as infiltration or evaporation can have a significant effect on the behavior of geotechnical structures located near the soil surface. This paper focuses on the drying process of soils due to evaporation. The scaling laws are analyzed and the results of the application of two cycles of heating and cooling on a soil mass are presented. Based on these results, conclusions about the feasibility of reproducing evaporation on centrifuge models are recommended.
Elastic Parameters of Intermediate Soils Based on Bender-Extender Elements Pulse Tests
(Elsevier BV, 2011) Carol Murillo; Mohammad Sharifipour; Bernardo Caicedo; Luc Thorel; Christophe Dano
Evaluación de la respuesta dinámica del subsuelo en depósitos volcánicos y sus implicaciones para el diseño sísmico
(Universidad de Los Andes, 1999) Luis E. Yamín; Bernardo Caicedo; Erick Solano
The presence of superficial soils of volcanic origin and large man made fills of varying materials, which are supported by more competent soils, is a general characteristic of the Colombian Coffee Growing Region. This paper present results from laboratory tests performed on unaltered samples of volcanic ash soil, the typical ranges of dynamic properties observed and the variation of shear modulus and associated damping with level of strain. It also evaluates the expected dynamic response of representative deposits and presents the results of sensibility analysis of relevant variables. The dynamic response is compared with one of the available accelerographic records for the January 25 1h, 1999 Armenia Earthquake, and the design spectra is proposed for areas with different characteristics.
Experimental Study of Evaporation from Soil-Atmosphere Interfaces
(RELX Group (Netherlands), 2024) Jaime Granados; Catalina Lozada; Bernardo Caicedo
Experimental Wave-Based Assessment of Liquefaction Resistance for Different Degrees of Saturation
(ASM International, 2023) Fausto Molina‐Gómez; António Viana da Fonseca; Cristiana Ferreira; Bernardo Caicedo
ABSTRACT This paper presents the results of an experimental program carried out in the laboratory aimed at assessing the liquefaction resistance by correlations between longitudinal wave (P-wave) and shear wave (S-wave) velocities (VP and VS) and cyclic stress ratio from triaxial testing (CSRCTx) for different degrees of saturation (Sr). The liquefaction resistance was assessed using a cyclic triaxial apparatus equipped with Hall-effect transducers and bender elements, combining stress-based (large-strain level) and wave-based (small-strain level) approaches. These tests were carried out in soil specimens at relatively high degrees of saturation, which were estimated during testing by VP measurements interpreted using Biot’s theory. The results revealed that, for the same relative density and confinement stress, the S-wave-based approach did not predict the liquefaction resistance well because of the negligible variation in the stress state and soil stiffness for the assessed Sr values, which were above the air-entry value. In turn, the P-wave-based approach effectively predicted the liquefaction resistance increment of the TP-Lisbon sand for different Sr conditions because of the strong dependency of P-wave propagation on the degree of saturation in granular media. This is a consequence of the most relevant factor conditioning the pore pressure buildup in partially saturated sands, e.g., the compressibility of the occluded air bubbles, which can be detected by VP but not by VS.
Homogenization of Rammed Earth Walls Under Changing Environmental Conditions
(RELX Group (Netherlands), 2023) Juan P. Villacreses; Bernardo Caicedo; Eduardo J. Rueda; Laura Ibagon; Johana Acosta
Influencia de la variabilidad del ángulo de fricción en cimentaciones superficiales
(2016) Cristhian Mendoza; Bernardo Caicedo
Lessons of the 25 January 1999 Earthquake in Central Colombia
(SAGE Publishing, 2000) Mauricio Sánchez‐Silva; Luis E. Yamín; Bernardo Caicedo
On January 25, 1999, an earthquake of magnitude M L = 6.1 occurred in central Colombia, which caused 1,200 deaths, 5,000 injuries, more than 250,000 people affected and economic losses estimated at US$1.2 billion. The earthquake left some important lessons that must be taken into account for the management of similar situations in the future. With respect to the behavior of buildings, the soundness and importance of the code of practice for buildings was demonstrated as a tool for the prevention of seismic disasters. The management of the emergency in cities such as Pereira and Armenia showed the need for planning, continued preparedness and mitigation awareness. The importance of the Colombian Prevention and Disaster Attention System (SNPAD) was demonstrated although the need to enhance organizational aspects, citizen awareness and participation was made evident. The characteristics of the disaster reflect a typical situation that can occur in many Latin American cities located in areas of high seismic risk. This article presents the main lessons learned from this event in the light of work performed by the research team for natural disasters from the Department of Civil and Environmental Engineering of the Universidad de Los Andes.
Medida perfil longitudinal de un pavimento mediante navegación inercial
(Universidad de Los Andes, 2003) Bernardo Caicedo; Carol Murillo; Julián Tristancho
El perfil longitudinal de un pavimento es un factor que esta directamente relacionado con el confort de una via. La escala estandar a nivel mundial para determinar la rugosidad es el IRI (Indice de Rugosidad Internacional). Este indice describe el confort que experimenta un usuario cuando se desplaza en un vehiculo a una velocidad de 80 km/h. Uno de los equipos empleados para la determinacion del IRI es el APL, equipo disenado por el Laboratorio Central des Ponts et Chaussees de Francia, cuyo funcionamiento esta basado en la utilizacion de un sistema oscilatorio mecanico. Este equipo presenta rangos de funcionamiento que generalmente estan por debajo de los rangos que se observan en algunas vias urbanas de Colombia. Lo anterior motivo la implementacion de un nuevo metodo de medicion basado en la navegacion inercial, con este nuevo sistema se logra la captura de registros digitales de alta resolucion y con un amplio rango de medida. En este trabajo se expone la metodologia y correlaciones necesarias para la puesta en marcha del equipo. Igualmente se presentan los resultados de la utilizacion del APLI modificado para la determinacion del IRI en vias urbanas. Del mismo modo se presenta una nueva aplicacion la cual consiste en tratar de determinar mediante el APLI modificado el confort que experimenta un ciclista que transite por una cicloruta similar a las construidas en la ciudad de Bogota.
Micromechanical Characterization of Diatom Frustules of Multiple Origin
(RELX Group (Netherlands), 2024) Daniel Alberto Zuluaga Astudillo; Juan Carlos Ruge; Bernardo Caicedo
MODELING WASHBOARD PATTERNS ON UNPAVED ROADS THROUGH TRANSPORT DYNAMICS
(RELX Group (Netherlands), 2025) Laura Ibagon; Juan Pablo Alvarado Perilla; Fernando López‐Caballero; Juan P. Villacreses; Bernardo Caicedo; Marı́a José Torres
MODELING WASHBOARD PATTERNS ON UNPAVED ROADS THROUGH TRANSPORT DYNAMICS
(RELX Group (Netherlands), 2025) Laura Ibagon; Juan Pablo Alvarado Perilla; Fernando López‐Caballero; Juan P. Villacreses; Bernardo Caicedo; Marı́a José Torres
New device to control the atmospheric boundary condition in centrifuge
(2006) Julián Tristancho; Bernardo Caicedo; Miguel Duque
Réduction des vibrations en centrifugeuse à l'aide de barrières en polystyrène expansé
(Centre National de la Recherche Scientifique, 2008) Carol Murillo; Luc Thorel; Bernardo Caicedo
Avec une barrière en polystyrène expansé, une étude paramétrique de réduction des vibrations se propageant dans un sable de Fontainebleau est réalisée en centrifugeuse. L'efficacité du système d'isolation est discutée selon la géométrie de la barrière (épaisseur, profondeur, distance à la source) et les fréquences (150 à 2000Hz) générées par une céramique piézoélectrique.
Riesgo sísmico, geotécnico y estructural. El caso de estudio de los edificios San Jerónimo de Yuste en Bogotá
(Spanish National Research Council, 2018) Juan Manuel Medina; Camilo Villate; Bernardo Caicedo; Luis E. Yamín; Juan F. Correal; Nicolás Estrada; Raul Rincón
El conjunto residencial San Jerónimo de Yuste se encuentra ubicado en Bogotá, en un terreno inclinado en el pie de monte de los cerros orientales de la ciudad. Fue construido entre 2008 y 2011, como parte de un proyecto de urbanización promovido por la caja de compensación familiar Compensar. Durante mayo y junio de 2013 el terreno presentó desplazamientos tanto verticales como horizontales que generaron daños visibles en las estructuras y motivaron la evacuación de dos de las seis torres que conforman el conjunto. El presente trabajo presenta los resultados de la investigación que llevaron a cabo los grupos de investigación de las facultades de Arquitectura e Ingeniería de la Universidad de los Andes para determinar las causas que condujeron al evento de desplazamiento de la estructura debidas al movimiento del terreno, estimar el coeficiente de seguridad actual y proponer intervenciones geotécnicas y estructurales que permitan recuperar la edificación.
Simulaciones con Diferencias Finitas en el Dominio del Tiempo de Suelos Isotrópicos sometidos a Control Continuo de Compactación
(2016) Camilo Herrera; Bernardo Caicedo
TECNOLOGÍAS PARA VÍAS TERCIARIAS: PERSPECTIVAS Y EXPERIENCIAS DESDE LA ACADEMIA
(Universidad de Los Andes, 2017) Silvia Caro; Bernardo Caicedo
The choice of technologies to be used for the construction and maintenance of tertiary roads needs to consider the specific requirements of each project. This includes undertaking a detailed characterization of the land in the areas in which the roads will be built and as well as the climatic conditions of the location. Moreover, the sources of materials available to construct pavement structures should be identified and the possibility of modifying some local materials that do not completely fulfill the current technical specifications should be evaluated in order to turn them into suitable materials. The initial purpose of this article is to highlight several features relating to the selection and use of technologies for tertiary roads that, from an academic perspective, are a priority to guarantee the success of these initiatives. Additionally, the document details two pieces of research that were recently undertaken by Universidad de los Andes addressing the use of non-conventional materials to construct tertiary roads in order to emphasize the role played by research in these types of road projects.