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检索条件"任意字段=6th European Conference on Numerical Methods in Geotechnical Engineering"

共 818 条记录，以下是1-10 订阅

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Benchmarking a BEM numerical model for a floating wind platform dynamics in Chilean offshore conditions 6th

Benchmarking a BEM numerical model for a floating wind platf...

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6th International conference on Renewable Energies Offshore, RENEW 2024

作者： Gallardo, Á. Streicher, M. Troch, P. Ahumada, J. Cifuentes, C. Tampier, G. Department of Civil Engineering Ghent University Ghent Belgium Naval Architecture and Ocean Engineering Department Universidad Austral de Chile Valdivia Chile Marine Energy Research and Innovation Center Santiago Chile

ISBN: (纸本)9781032905570

Given the local conditions and capabilities, semi-submersible floating offshore wind turbines (FOWT) appear to be the most suitable concept for harnessing Chile’s substantial offshore wind energy potential. However, compared to Spar or Tension Leg Platforms (TLP) like the proposed in the INF4INITY project, semisubmersibles tend to experience greater motions. Since large motions and accelerations are critical to the survivability of these platforms, it is essential to quantify them during the design process. Consequently, efficient modelling becomes a desired feature on the initial phase of the design, such it allow to optimize the platform following an iterative process. this study evaluates the accuracy and applicability of a numerical model formulated in the frequency domain and based on the Boundary Element Method (BEM). the behavior of a generic semi-submersible wind energy platform under both operational and extreme conditions is assessed, with results compared to experimental data. Analyses include platform motion and mooring forces in both regular and irregular wave conditions. the obtained results reveal the limitations of the numerical model when applying to model the behaviour of FOWT, and methods for improvement are suggested for future investigations. © 2025 the Author(s).

关键词： Frequency domain analysis

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Improved double-point material point method for dynamic geotechnical problems 12

Improved double-point material point method for dynamic geot...

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12th International conference on Structural Dynamics (EURODYN)

作者： Chmelnizkij, Alexander Hamburg Univ Technol Inst Geotech Engn & Construct Management Harburger Schlossstr 20 D-21079 Hamburg Germany

the Material Point method is a suitable numerical method to simulate large deformations often occurring in geotechnical engineering. the Double-Point MPM (2P-MPM) extends the simulations for water-saturated materials. In the present work, a coupled dynamic formulation is used to account for coupled wave propagation in porous media in addition to large deformations. the computational cost of 2P-MPM is expensive because information between material points and grid nodes must be approximated at each time step. In conventional 2PMPM formulations, linear shape functions are used for this approximation, leading to wellknown grid crossing and loss of contact problems. We use the moving least square approximation for the 2P-MPM to handle these problems better. In addition, a parallelization approach is shown to improve the computation time, especially for large boundary value problems. the developed methods can be combined with non-saturated materials, such as fluids and dry soil, to simulate complex geotechnical issues. the performed computations of wave propagation and large deformations using the proposed methods show improved convergence behavior and increased efficiency.

关键词： Wave propagation

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Reliability Approach for Structural Safety Assessment Using Finite Element Method and Machine Learning 14th

Reliability Approach for Structural Safety Assessment Using ...

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14th International conference on Information Society and Technology, ICIST 2024

作者： Bodić, Aleksandar Rakić, Dragan Milovanović, Vladimir Faculty of Engineering University of Kragujevac Sestre Janjić 6 Kragujevac34000 Serbia

ISBN: (纸本)9783031714184

Traditional methods for analysing geotechnical structures typically rely on the deterministic approach, where the primary focus is on determining factor of safety (FoS) for structure. However, this approach may yield different failure probabilities despite similar values of safety factors due to conservative assumptions and unreliable initial data. this paper integrates reliability approach, finite element method (FEM), and machine learning (ML) to enhance safety assessments in geotechnical engineering. In this paper, an example of a uniaxial compression test of specimen is considered. numerical simulations are conducted using PAK software. the parameters of the material model are generated according to the Gaussian (normal) distribution and 10 000 calculations are created based on these distributions. Results obtained from numerical simulations are used to train a neural network, which classifies calculation as converged or diverged, i.e., a structure as stable or unstable based on the material model parameters. this approach reduces the need for an extensive number of time-consuming numerical simulations, which can be a significant resource drain in engineering applications. It can be concluded that, by coupling FEM and ML, safety of the structures can be effectively analysed using the concept of reliability. © the Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Compression testing

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NONLINEAR BEHAVIOR OF EXISTING MASONRY STRUCTURES: AN APPLICATION TO A CASE STUDY WIth DIFFERENT STRUCTURAL CONFIGURATIONS 9

NONLINEAR BEHAVIOR OF EXISTING MASONRY STRUCTURES: AN APPLIC...

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9th ECCOMAS thematic conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2023

作者： Sulla, Roselena D'Amato, Michele Gigliotti, Rosario Liberatore, Domenico DiCEM Dept. of European and Mediterranean Cultures: Architecture Environment and Cultural Heritage University of Basilicata Via Lanera Matera75100 Italy DISG Dept. of Structural and Geotechnical Engineering Sapienza University of Rome Via Eudossiana 18 Rome00184 Italy DSDRA Dept. of History Representation and Restoration of Architecture Sapienza University of Rome Piazza Borghese 9 Rome00186 Italy

numerical simulations and computational methods are directly connected to structures strength models and modeling criteria. this work refers to masonry elements, in particular to the piers and spandrels strength models according to the Italian Design Code. these models are firstly reviewed in a dimensionless form, then applied to a parametric analysis comparing the results obtained by varying masonry strength and in-plane floor flexibility. the masonry buildings seismic behavior is analyzed by performing pushover analyses according to the equivalent frame model on an ideal case study, which is replicated with the same geometric and dimensional characteristics but with different masonry types and floor behaviors. the aim is to evaluate the influence of masonry strength and floor stiffness on the global response. Finally, fragility curves are derived and compared to literature ones. © 2023 COMPDYN Proceedings. All rights reserved

关键词： numerical methods

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Effects of Shear Wave Velocity Uncertainties on the geotechnical and Geophysical Analysis of an Urban Site (Oran, Algeria) 7th

Effects of Shear Wave Velocity Uncertainties on the Geotechn...

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7th International conference on Earthquake engineering and Seismology, ICEES 2023

作者： Mekki, Mohammed Elachachi, Sidi Mohammed Hemsas, Miloud Zoutat, Meriem LM2SC Laboratory Department of Civil Engineering FACE University of Sciences and Technology Mohamed Boudiaf Oran Algeria I2M UMR 5295 University of Bordeaux Talence France LSTE Laboratory Department of Civil Engineering Faculty for Sciences and Technology University of Mascara Mascara Algeria

ISBN: (纸本)9783031573569

Soil properties show high heterogeneity at different spatial scales and their precise characterization remains a crucial challenge, especially over large areas. Among these properties, the averaged shear wave velocity constitutes a principal geotechnical soil property for site response analysis. the aim of this study is to quantify the impact of different types of uncertainties (epistemic and aleatory) that arise from the shear wave velocity estimation method on the spatial variability of this parameter. thus, several methods to pass from a field of point resistance values (from penetrometer tests) to a field of shear wave velocities are compared, varying mainly in how the empirical relationship between these quantities is applied. the application of this concept consists to establish of a shear wave velocity distribution map through a geotechnical study of Oran city (Algeria) in order to highlight the soft soils where a greater amplification of the seismic force occurs. the analysis allows classifying the soils according to the RPA-99 (national seismic code) and Eurocode 8 (european seismic code) classification and their seismic behavior. the results of the present study show that, the presence of epistemic uncertainties in the used model can greatly influence the shear wave velocity value. these uncertainties are due mainly to the way in which each method determined. © the Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Soils

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G-PFEM numerical Assessment of Rock Anchor Interface Properties on Pull-Out Capacity for Renewable Offshore Applications 8th

G-PFEM Numerical Assessment of Rock Anchor Interface Propert...

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8th Italian conference of Researchers in geotechnical engineering, CNRIG 2023

作者： Genco, Alessio Ciantia, Matteo Oryem Brown, Michael Previtali, Marco Ivanovic, Ana Cresswell, Nick School of Science and Engineering University of Dundee Dundee United Kingdom School of Engineering University of Aberdeen Aberdeen United Kingdom Swift Anchors La Belle Esperance The Shore EdinburghEH6 6QW United Kingdom

ISBN: (纸本)9783031347603

With the challenges faced by tidal stream generator application, it is necessary to develop a new generation of Rock Anchors (RAs) that are easy to install and efficient, with accurate, robust, and realistic design procedures. the harsh marine environment requires efficient anchoring solutions capable of sustaining the complex loading conditions experienced. Current RA technologies require simple and robust design methods to overcome the conservatism adopted in classical procedures. therefore, advanced numerical methods have a crucial role to play in the enhancement of the RA design process. the geotechnical Particle Finite Element Method (G-PFEM) is an open-source numerical tool suitable for large strain problems and is used herein to investigate the influence of steel-rock interface properties on RA pull-out. A large deformation constitutive model for structured materials, calibrated to replicate the behavior of calcarenite and sandstone, is used to simulate the RA response under axial loading. the Contact Domain (CD) technique is described and was adopted for this work. the parametric analysis considering various combinations of steel-rock interface friction angle (δ ), the inclination of the lateral face of the anchor (α ) and contact parameters was performed. the results highlight how interface friction affect performance in soft and hard rocks. Due to the large deformation capabilities and the non-local formulation of the numerical approach the RA failure mechanism is realistically investigated. © 2023, the Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： numerical methods

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numerical ANALYSIS OF DIELECTROPHORETIC-BASED DNA SEPARATION AND TRAPPING

NUMERICAL ANALYSIS OF DIELECTROPHORETIC-BASED DNA SEPARATION...

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6th Joint US-european ASME-Fluids-engineering-Division (FED) Summer Meeting

作者： Darabi, Jeff Southern Illinois Univ Dept Mech Engn Edwardsville IL 62026 USA

ISBN: (纸本)9780791885840

In this study, dielectrophoresis (DEP) has been coupled with field-flow fractionation (FFF) for the sorting and trapping of the biological particles. A numerical simulation is performed to compute particle trajectories under the influence of DEP, drag, gravitational, and buoyancy forces, as well as Brownian motion. the simulation was performed using OpenFOAM CFD software. Both positive and negative DEP methods are examined as possible separation techniques for DNA fragments. Positive DEP forces are used to attract the particles to the electrodes and trap them in groups of similar particles while a combination of negative DEP forces and field flow fractionation (FFF) are used to levitate the particles within the fluid flow to certain flow trajectories. the results obtained from this study, including electric field simulations, particle trajectories, elution times, and trapping lengths are presented.

关键词： dielectrophoresis field-flow fractionation particle trajectory numerical simulation

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Experimental Testing Versus numerical Modelling of Small Masonry Wallettes in Axial Compression 18th

Experimental Testing Versus Numerical Modelling of Small Mas...

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18th International Brick and Block Masonry conference, IB2MaC 2024

作者： Falkjar, Kristian Zagaroli, Armando Kubica, Jan Department of Structural Engineering Faculty of Civil Engineering Silesian University of Technology Gliwice44-100 Poland

ISBN: (纸本)9783031733093

this study investigated the differences between standard test methods versus numerical modelling in compression. It had the following two objectives: to compare differences between the EN and ASTM standard test results, and to determine the applicability of material tests to predict masonry wall properties. Clay bricks designed to imitate the traditional manual manufacturing process were used. For the mortar, Type II/B 32.5R cement, calcium lime CL 90 and sand were mixed at cement-lime-sand volume ratios of 1:1:6 and 1:2:9. Specimens were tested with both mortar mix designs under both the ASTM C1314-14 and EN 1052-1 methods. Experimental compressive testing using the ASTM method involved specimens 5 bricks high, with displacement measured in the vertical axis on both the front and rear faces. Compressive testing using the EN Standard involved running bond specimens 7 bricks high and two bricks long, measuring the displacement in both the vertical and horizontal directions on both faces. numerical modelling of the small masonry wallettes was undertaken using Abaqus software, by means of a developed detailed micro-model. Input parameters for the compressive strength of the brick and mortar materials was taken from prior experimental work testing the brick units and mortar. Results were compared between the experimental prisms and numerical models derived from material tests. It was found that the modulus of elasticity of the mortar in the masonry joint could not be predicted by a mortar prism test, however, all other mechanical properties of the wall assembly could be predicted by a finite element model constructed from the individual material tests. © the Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Mortar

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Flow Simulation and Investigation Around a Estate Vehicle Using Hybrid methods

Flow Simulation and Investigation Around a Estate Vehicle Us...

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6th Joint US-european ASME-Fluids-engineering-Division (FED) Summer Meeting

作者： Delassaux, Franois Mortazavi, Iraj Herbert, Vincent Ribes, Charles CNAM Lab M2N 2 Rue Conte F-75003 Paris France Stellantis Route Gisy Velizy Villacoublay France

ISBN: (纸本)9780791885840

In this work hybrid RANS/LES methods are adapted in order to simulate the flow around a realistic car geometry (estate vehicle). numerical results are compared to in-house experiments. In order to achieve an accurate understanding of the flow behavior around the car geometry, a wide range of experiments are performed measuring forces, pressure coefficients and tomography for 3D description of the flow in the wake of the body.

关键词： Flow simulation Vehicles Flow (Dynamics) Geometry Reynolds-averaged Navier–Stokes equations Wakes Pressure

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Structural reliability analysis using imprecise evolutionary power spectral density functions 12

Structural reliability analysis using imprecise evolutionary...

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12th International conference on Structural Dynamics (EURODYN)

作者： Behrendt, Marco Dang, Chao Faes, Matthias G. R. Valdebenito, Marcos A. Beer, Michael Leibniz Univ Hannover Inst Risk & Reliabil Callinstr 34 D-30167 Hannover Germany TU Dortmund Univ Chair Reliabil Engn Leonhard Euler Str 5 D-44227 Dortmund Germany Univ Liverpool Inst Risk & Uncertainty Peach St Liverpool L69 7ZF Merseyside England Tongji Univ Int Joint Res Ctr Engn Reliabil & Stochast Mech 1239 Siping Rd Shanghai 200092 Peoples R China

Buildings and structures in many regions of the world are exposed to environmental factors that can cause damage or failure, making it essential to model these factors accurately in engineering. Stochastic dynamics are crucial for modelling environmental processes, such as earthquake ground motions and wind loads, which can be characterised by a power spectral density (PSD) function that determines the dominant frequencies and corresponding amplitudes of the process. However, when generating a load model described by a PSD function, uncertainties in the processes must be taken into account, which makes a reliable estimation of the PSD function challenging, especially with only limited data available. this study employs the recently developed imprecise PSD function by using a radial basis function network to optimise data-enclosing bounds that produce an interval-valued PSD function. With this approach, a data set in the frequency domain can be bounded for uncertainty quantification. the method described in this work consists of optimising best-case and worst-case PSD functions within the bounds, which are transformed into a separable evolutionary PSD function. the reliability of structures is determined by an upper and lower failure probability, taking into account the present uncertainties. Advanced interval propagation schemes are linked to the imprecise PSD function to determine the failure probabilities efficiently. the method is illustrated by means of three numerical examples.

关键词： numerical methods

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