Ponències/Comunicacions de congressoshttp://hdl.handle.net/2117/4292024-03-28T23:14:38Z2024-03-28T23:14:38ZUna formulación general para el análisis elastoplástico de estructuras sometidas a grandes movimientosOliver Olivella, XavierOñate Ibáñez de Navarra, Eugeniohttp://hdl.handle.net/2117/3973862023-11-30T11:20:19Z2023-11-30T11:15:07ZUna formulación general para el análisis elastoplástico de estructuras sometidas a grandes movimientos
Oliver Olivella, Xavier; Oñate Ibáñez de Navarra, Eugenio
Se presenta una formulación para el estudio de estructuras tipo lámina, placa, arco o viga sometidos a grandes movimientos en régimen elastoplástico. La formulación utiliza la descripción Lagrangiana de la deformación y el concepto de degeneración de elementos tridimensionales que permite utilizar elementos finitos bidimensionales en el análisis de láminas y placas, y unidimensionales en el análisis de arcos y vigas. La formulación deducida para láminas permite obtener con suma facilidad las correspondientes a placas, arcos y vigas. Se presentan ejemplos de aplicación a diversas estructuras y al caso particular del análisis de la deformación de tuberías marinas durante su
instalación
2023-11-30T11:15:07ZOliver Olivella, XavierOñate Ibáñez de Navarra, EugenioSe presenta una formulación para el estudio de estructuras tipo lámina, placa, arco o viga sometidos a grandes movimientos en régimen elastoplástico. La formulación utiliza la descripción Lagrangiana de la deformación y el concepto de degeneración de elementos tridimensionales que permite utilizar elementos finitos bidimensionales en el análisis de láminas y placas, y unidimensionales en el análisis de arcos y vigas. La formulación deducida para láminas permite obtener con suma facilidad las correspondientes a placas, arcos y vigas. Se presentan ejemplos de aplicación a diversas estructuras y al caso particular del análisis de la deformación de tuberías marinas durante su
instalaciónUna formulación de bandas finitas para el análisis de placas, puentes y láminas de revoluciónCasteleiro Maldonado, ManuelSuárez Arroyo, BenjamínOñate Ibáñez de Navarra, Eugeniohttp://hdl.handle.net/2117/3973712023-12-03T09:00:10Z2023-11-30T09:41:55ZUna formulación de bandas finitas para el análisis de placas, puentes y láminas de revolución
Casteleiro Maldonado, Manuel; Suárez Arroyo, Benjamín; Oñate Ibáñez de Navarra, Eugenio
En el presente artículo se desarrolla una técnica para disipar tensiones de tracción en materiales que no admiten dichas tensiones, y que se aplica al análisis elástico lineal -de una presa bóveda proyectada en la cuenca del Noguera Pallaresa. Se ha demostrado prácticamente la satisfactoria convergencia del método, y se ha estudiado la influencia en la distribución de tensiones de la eliminación iterativa de las tracciones. Esta técnica puede ser igualmente aplicable a análisis no lineales en los que intervengan este tipo de materiales.
2023-11-30T09:41:55ZCasteleiro Maldonado, ManuelSuárez Arroyo, BenjamínOñate Ibáñez de Navarra, EugenioEn el presente artículo se desarrolla una técnica para disipar tensiones de tracción en materiales que no admiten dichas tensiones, y que se aplica al análisis elástico lineal -de una presa bóveda proyectada en la cuenca del Noguera Pallaresa. Se ha demostrado prácticamente la satisfactoria convergencia del método, y se ha estudiado la influencia en la distribución de tensiones de la eliminación iterativa de las tracciones. Esta técnica puede ser igualmente aplicable a análisis no lineales en los que intervengan este tipo de materiales.Comportamiento sísmico de los monumentos históricosBarbat Barbat, Horia Alejandrohttp://hdl.handle.net/2117/3689772022-09-11T12:08:03Z2022-06-22T09:22:56ZComportamiento sísmico de los monumentos históricos
Barbat Barbat, Horia Alejandro
En el artículo se estudia el comportamiento sísmico de las estructuras históricas utilizando el concepto de vulnerabilidad sísmica desde un punto de vista puramente intuitivo. Se considera que las construcciones antiguas, que han sobrevivido a lo largo de los siglos al efecto de los terremotos, tienen detalles constructivos que contribuyeron directamente a su supervivencia y se intentará identificar dichos detalles. Se examina la vulnerabilidad sísmica de edificios históricos como el Partenón de Atenas, el Panteón de Roma, la Catedral Santa Sofía de Constantinopla, la iglesia San Vitale de Rávena y la Catedral Notre-Dame de París y se intenta hacer, para cada tipología, observaciones más generales; The seismic behaviour of historical structures is analysed in the paper using, in a purely intuitive manner, the concept of seismic vulnerability. lt is assumed that the ancient structures, which survived during centuries to the action of earthquakes, have construction details which directly contributed to their good seismic behaviour and an attempt is made to identify those details. The seismic vulnerability of ancient structure like the Parthenon of Athens, the Pantheon of Rome, the Hagia Sophia of Constantinople, the San Vitale church of Ravenna y the Cathedral Notre-Dame of Paris will be examined in this paper and more general observation on their typology will be also made.
2022-06-22T09:22:56ZBarbat Barbat, Horia AlejandroEn el artículo se estudia el comportamiento sísmico de las estructuras históricas utilizando el concepto de vulnerabilidad sísmica desde un punto de vista puramente intuitivo. Se considera que las construcciones antiguas, que han sobrevivido a lo largo de los siglos al efecto de los terremotos, tienen detalles constructivos que contribuyeron directamente a su supervivencia y se intentará identificar dichos detalles. Se examina la vulnerabilidad sísmica de edificios históricos como el Partenón de Atenas, el Panteón de Roma, la Catedral Santa Sofía de Constantinopla, la iglesia San Vitale de Rávena y la Catedral Notre-Dame de París y se intenta hacer, para cada tipología, observaciones más generales
The seismic behaviour of historical structures is analysed in the paper using, in a purely intuitive manner, the concept of seismic vulnerability. lt is assumed that the ancient structures, which survived during centuries to the action of earthquakes, have construction details which directly contributed to their good seismic behaviour and an attempt is made to identify those details. The seismic vulnerability of ancient structure like the Parthenon of Athens, the Pantheon of Rome, the Hagia Sophia of Constantinople, the San Vitale church of Ravenna y the Cathedral Notre-Dame of Paris will be examined in this paper and more general observation on their typology will be also made.El método del espectro de capacidad aplicado a la evaluación de daños sísmicosChiroiu, LGoula Suriñach, XavierRoca Adrover, AntoniSusagna Vidal, TeresaBarbat Barbat, Horia AlejandroPujades Beneit, Lluíshttp://hdl.handle.net/2117/3687632022-09-11T06:56:46Z2022-06-21T09:39:55ZEl método del espectro de capacidad aplicado a la evaluación de daños sísmicos
Chiroiu, L; Goula Suriñach, Xavier; Roca Adrover, Antoni; Susagna Vidal, Teresa; Barbat Barbat, Horia Alejandro; Pujades Beneit, Lluís
El método del espectro de capacidad constituye una herramienta nueva que se puede utilizar para el análisis de daños estructurales y no estructurales debidos a una acción sísmica tanto para la generación de escenarios de daños como para la rehabilitación de edificios. Basándose en parámetros espectrales como desplazamiento o aceleración, el método del espectro de capacidad es un procedimiento de análisis estructural no lineal simplificado. Una aplicación preliminar del método en la estimación del riesgo sísmico se ha hecho para un espectro de demanda adaptado a las condiciones locales de la ciudad de Barcelona. Los resultados se han comparado con otros estudios anteriores.; The Capacity Spectrum Method is a recent tool which could be very useful far the analysis of structural and non-structural seismic damages far producing damage scenarios and far buildings retrofitting. Based on spectral parameters like displacement or acceleration, the Capacity Spectrum Method is a simplified han linear structural analysis procedure. A preliminary application of this method has been carried out in arder to estímate the seismic risk corresponding to the local site conditions far the city of Barcelona. The results are compared with previous studies.
2022-06-21T09:39:55ZChiroiu, LGoula Suriñach, XavierRoca Adrover, AntoniSusagna Vidal, TeresaBarbat Barbat, Horia AlejandroPujades Beneit, LluísEl método del espectro de capacidad constituye una herramienta nueva que se puede utilizar para el análisis de daños estructurales y no estructurales debidos a una acción sísmica tanto para la generación de escenarios de daños como para la rehabilitación de edificios. Basándose en parámetros espectrales como desplazamiento o aceleración, el método del espectro de capacidad es un procedimiento de análisis estructural no lineal simplificado. Una aplicación preliminar del método en la estimación del riesgo sísmico se ha hecho para un espectro de demanda adaptado a las condiciones locales de la ciudad de Barcelona. Los resultados se han comparado con otros estudios anteriores.
The Capacity Spectrum Method is a recent tool which could be very useful far the analysis of structural and non-structural seismic damages far producing damage scenarios and far buildings retrofitting. Based on spectral parameters like displacement or acceleration, the Capacity Spectrum Method is a simplified han linear structural analysis procedure. A preliminary application of this method has been carried out in arder to estímate the seismic risk corresponding to the local site conditions far the city of Barcelona. The results are compared with previous studies.Las herramientas SIG en el análisis de vulnerabilidad y escenarios de riesgo sísmicoLantada, NievesPujades Beneit, LluísBarbat Barbat, Horia Alejandrohttp://hdl.handle.net/2117/3645232022-09-11T03:05:43Z2022-03-18T10:32:42ZLas herramientas SIG en el análisis de vulnerabilidad y escenarios de riesgo sísmico
Lantada, Nieves; Pujades Beneit, Lluís; Barbat Barbat, Horia Alejandro
An integrated GIS-based analysis (using ArcView GIS) is performed in order to estimate risk scenarios for EMS-98 seismic intensities in Barcelona (Spain), according to a methodology developed within the Risk-UE Project of the European Commission.
The specific buildings of Barcelona are classified in different groups characterized by a similar seismic behaviour. In this way, an average vulnerability index is associated to each building typology. This index is refined on the basis of behaviour modifiers, linked to the year of construction, the number of stories and other information obtained by using GIS (the irregularity in height, the position of the building within the aggregate and differences in the height of adjacent buildings). The damage probability distribution, corresponding to the fragility curves, is described by a beta distribution, characterized by means of the mean damage grade parameter, which is related to the vulnerability index and intensity.
The ability of GIS tools to store, manage and display the large amount of spatial and tabular data involved in this study allows to map vulnerability indices, and damage scenarios at different scale ranges, which may be used for emergency planning and civil protection.
2022-03-18T10:32:42ZLantada, NievesPujades Beneit, LluísBarbat Barbat, Horia AlejandroAn integrated GIS-based analysis (using ArcView GIS) is performed in order to estimate risk scenarios for EMS-98 seismic intensities in Barcelona (Spain), according to a methodology developed within the Risk-UE Project of the European Commission.
The specific buildings of Barcelona are classified in different groups characterized by a similar seismic behaviour. In this way, an average vulnerability index is associated to each building typology. This index is refined on the basis of behaviour modifiers, linked to the year of construction, the number of stories and other information obtained by using GIS (the irregularity in height, the position of the building within the aggregate and differences in the height of adjacent buildings). The damage probability distribution, corresponding to the fragility curves, is described by a beta distribution, characterized by means of the mean damage grade parameter, which is related to the vulnerability index and intensity.
The ability of GIS tools to store, manage and display the large amount of spatial and tabular data involved in this study allows to map vulnerability indices, and damage scenarios at different scale ranges, which may be used for emergency planning and civil protection.A sensibility analysis to geometric and cutting conditions using the particle finite element method (PFEM)Rodriguez Prieto, Juan ManuelArrazola, PedroCante Terán, Juan CarlosKortabarria, ArratibelOliver Olivella, Xavierhttp://hdl.handle.net/2117/1897292022-10-09T03:57:43Z2020-06-02T12:14:29ZA sensibility analysis to geometric and cutting conditions using the particle finite element method (PFEM)
Rodriguez Prieto, Juan Manuel; Arrazola, Pedro; Cante Terán, Juan Carlos; Kortabarria, Arratibel; Oliver Olivella, Xavier
The (PFEM) is employed to simulate orthogonal metal cutting of 42CD4 steel. The objectives of this work are mainly three: The first one is to validate PFEM strategies as an efficient tool for numerical simulation of metal cutting processes by a detailed comparison (forces, stresses, strains, temperature, etc.) with results provided by commercial finite element software (Abaqus, AdvantEdge, Deform) and experimental results. The second is to carry out a sensibility analysis to geometric and cutting conditions using PFEM by means of a Design of Experiments (DoE) methodology. And the third one is to identify the advantages and drawbacks of PFEM over FEM and meshless strategies.
Also, this work identifies some advantages of PFEM that directly apply to the numerical simulation of machining processes: (i) allows the separation of chip and workpiece without using a physical or geometrical criterion (ii) presents negligible numerical diffusion of state variables due to continuous triangulation, (iii) is an efficient numerical scheme in comparison with FEM.
2020-06-02T12:14:29ZRodriguez Prieto, Juan ManuelArrazola, PedroCante Terán, Juan CarlosKortabarria, ArratibelOliver Olivella, XavierThe (PFEM) is employed to simulate orthogonal metal cutting of 42CD4 steel. The objectives of this work are mainly three: The first one is to validate PFEM strategies as an efficient tool for numerical simulation of metal cutting processes by a detailed comparison (forces, stresses, strains, temperature, etc.) with results provided by commercial finite element software (Abaqus, AdvantEdge, Deform) and experimental results. The second is to carry out a sensibility analysis to geometric and cutting conditions using PFEM by means of a Design of Experiments (DoE) methodology. And the third one is to identify the advantages and drawbacks of PFEM over FEM and meshless strategies.
Also, this work identifies some advantages of PFEM that directly apply to the numerical simulation of machining processes: (i) allows the separation of chip and workpiece without using a physical or geometrical criterion (ii) presents negligible numerical diffusion of state variables due to continuous triangulation, (iii) is an efficient numerical scheme in comparison with FEM.Multi-objective design optimisation of stamping process for advanced high strength steelsLee, Dong SeopPons Prats, JordiEspinoza Román, Héctor GabrielFruitós Bickham, Óscar AlejandroOñate Ibáñez de Navarra, Eugeniohttp://hdl.handle.net/2117/1178302023-09-17T01:47:35Z2018-06-05T12:33:55ZMulti-objective design optimisation of stamping process for advanced high strength steels
Lee, Dong Seop; Pons Prats, Jordi; Espinoza Román, Héctor Gabriel; Fruitós Bickham, Óscar Alejandro; Oñate Ibáñez de Navarra, Eugenio
The paper investigates the multi-objective design optimisation of stamping process to control both the shape and quality of final Advanced High Strength Steels (AHSSs) in terms of springback and safety using Distributed Multi-Objective Evolutionary Algorithm (DMOGA) coupled with Finite Element Analysis (FEA) based stamping analyser. The design problem of stamping process is formulated to minimise the difference between the desired shape and the final geometry obtained by a numerical simulation accounting elastic springback.
2018-06-05T12:33:55ZLee, Dong SeopPons Prats, JordiEspinoza Román, Héctor GabrielFruitós Bickham, Óscar AlejandroOñate Ibáñez de Navarra, EugenioThe paper investigates the multi-objective design optimisation of stamping process to control both the shape and quality of final Advanced High Strength Steels (AHSSs) in terms of springback and safety using Distributed Multi-Objective Evolutionary Algorithm (DMOGA) coupled with Finite Element Analysis (FEA) based stamping analyser. The design problem of stamping process is formulated to minimise the difference between the desired shape and the final geometry obtained by a numerical simulation accounting elastic springback.Robust active shock control bump design optimisation using parallel hybrid-MOGALee, Dong SeopBugeda Castelltort, GabrielPeriaux, Jacques FrancisOñate Ibáñez de Navarra, Eugeniohttp://hdl.handle.net/2117/1176052023-09-17T10:03:01Z2018-05-29T13:23:29ZRobust active shock control bump design optimisation using parallel hybrid-MOGA
Lee, Dong Seop; Bugeda Castelltort, Gabriel; Periaux, Jacques Francis; Oñate Ibáñez de Navarra, Eugenio
The paper investigates a robust optimisation for detail design of active shock control bump on a transonic Natural Laminar Flow (NLF) aerofoil using a Multi-Objective Evolutionary Algorithm (MOEA) coupled to Computational Fluid Dynamics (CFD) software. For MOEA, Robust Multi-objective Optimisation Platform (RMOP) developed in CIMNE is used. For the active shock control bump design, two different optimisation methods are considered; the first method is a Pareto- Game based Genetic Algorithm in RMOP (denoted as RMOGA). The second method uses a Hybridised RMOGA with Game-Strategies and a parallel computation for high performance computation. The paper not only shows how a shock control bump approach coupled to CFD improves aerodynamic performance of original transonic aerofoil but also it shows how high performance computation with applying Hybrid- Game and parallel computation increase the efficiency of optimisation in terms of computational cost and result accuracy.
2018-05-29T13:23:29ZLee, Dong SeopBugeda Castelltort, GabrielPeriaux, Jacques FrancisOñate Ibáñez de Navarra, EugenioThe paper investigates a robust optimisation for detail design of active shock control bump on a transonic Natural Laminar Flow (NLF) aerofoil using a Multi-Objective Evolutionary Algorithm (MOEA) coupled to Computational Fluid Dynamics (CFD) software. For MOEA, Robust Multi-objective Optimisation Platform (RMOP) developed in CIMNE is used. For the active shock control bump design, two different optimisation methods are considered; the first method is a Pareto- Game based Genetic Algorithm in RMOP (denoted as RMOGA). The second method uses a Hybridised RMOGA with Game-Strategies and a parallel computation for high performance computation. The paper not only shows how a shock control bump approach coupled to CFD improves aerodynamic performance of original transonic aerofoil but also it shows how high performance computation with applying Hybrid- Game and parallel computation increase the efficiency of optimisation in terms of computational cost and result accuracy.Parallel adaptive mesh refinement for incompressible flow problemsCotela Dalmau, JordiRossi, RiccardoOñate Ibáñez de Navarra, EugenioLafontaine, Nelson MaireniIdelsohn Barg, Sergio Rodolfohttp://hdl.handle.net/2117/1176032023-09-17T08:12:37Z2018-05-29T13:09:03ZParallel adaptive mesh refinement for incompressible flow problems
Cotela Dalmau, Jordi; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio; Lafontaine, Nelson Maireni; Idelsohn Barg, Sergio Rodolfo
We present an algorithm for the solution of the incompressible Navier-
Stokes equations combined with local refinement of the mesh based on an error estimation. Our solution strategy is based on well-established CFD techniques and has been designed to be efficient and scalable in a parallel environment. This has proved to be specially challenging for the mesh refinement, for which we propose an algorithm designed to use as little non-local information as possible. We complement the discussion with a numerical example.
2018-05-29T13:09:03ZCotela Dalmau, JordiRossi, RiccardoOñate Ibáñez de Navarra, EugenioLafontaine, Nelson MaireniIdelsohn Barg, Sergio RodolfoWe present an algorithm for the solution of the incompressible Navier-
Stokes equations combined with local refinement of the mesh based on an error estimation. Our solution strategy is based on well-established CFD techniques and has been designed to be efficient and scalable in a parallel environment. This has proved to be specially challenging for the mesh refinement, for which we propose an algorithm designed to use as little non-local information as possible. We complement the discussion with a numerical example.Stochastic and robust design procedures applied to the optimization with uncertaintiesPons Prats, JordiBugeda Castelltort, GabrielZárate Araiza, José FranciscoOñate Ibáñez de Navarra, Eugeniohttp://hdl.handle.net/2117/1175942023-09-17T09:45:32Z2018-05-28T22:47:42ZStochastic and robust design procedures applied to the optimization with uncertainties
Pons Prats, Jordi; Bugeda Castelltort, Gabriel; Zárate Araiza, José Francisco; Oñate Ibáñez de Navarra, Eugenio
Engineers agree with the fact that uncertainty is an important issue to get a better model of real behavior. Uncertainty quantification techniques have been largely developed during the recent years; Stochastic and probabilistic collocation methods are clear examples of recent developments. This work is based on a more traditional uncertainty quantification method, as Monte-Carlo method and its extension to Latin Hypercube sampling techniques. Two definitions of the optimization problem have been analyzed. The first one is the called Stochastic procedure, while the second one is the Robust one. Both of them deal with uncertainty on the input parameters, but they manage the uncertainty effects from two different points of view. Applications to aerodynamics and aero-elastic problems have been described.
2018-05-28T22:47:42ZPons Prats, JordiBugeda Castelltort, GabrielZárate Araiza, José FranciscoOñate Ibáñez de Navarra, EugenioEngineers agree with the fact that uncertainty is an important issue to get a better model of real behavior. Uncertainty quantification techniques have been largely developed during the recent years; Stochastic and probabilistic collocation methods are clear examples of recent developments. This work is based on a more traditional uncertainty quantification method, as Monte-Carlo method and its extension to Latin Hypercube sampling techniques. Two definitions of the optimization problem have been analyzed. The first one is the called Stochastic procedure, while the second one is the Robust one. Both of them deal with uncertainty on the input parameters, but they manage the uncertainty effects from two different points of view. Applications to aerodynamics and aero-elastic problems have been described.