Séance de cours

Analyse non linéaire des structures

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CIVIL-449: Nonlinear analysis of structures

This course deals with nonlinear modelling of structures under mechanical loading. ...

Description

Cette séance de cours couvre la révision des concepts de base de l'analyse structurelle matricielle, y compris la matrice de rigidité des éléments simples, la transformation géométrique et la condensation statique. Des exemples sont donnés pour les structures composées de barres, en se concentrant sur le comportement linéaire des matériaux élastiques et la réponse géométrique.

Enseignant·e·s (3)

Katrin Beyer

Since 2017 Associate Professor, School of Architecture, Civil and Environmental Engineering (ENAC), EPFL. Head of the Earthquake Engineering and Structural Dynamics (EESD) Laboratory 2010-2017 Assistant Professor, EPFL. 2008-2010 Post-doctoral researcher, ETH Zürich. 2003-2007 Ph.D., Roseschool / Università di Pavia, Italy. 2001-2003 Ove Arup & Partners, Advanced Technology and Research Group, London. 2001 Diploma, Civil engineering, ETH Zürich.

Dimitrios Lignos

Prof. Lignos joined the École Polytechnique Féderale de Lausanne (EPFL) in 2016 from McGill University in Canada where he was a tenured Associate Professor and a William Dawson Scholar for Infrastructure Resilience. He holds a diploma (National Technical University of Athens, NTUA, 2003), M.S. (Stanford University, 2004) and Ph.D. (Stanford University, 2008). In addition, he was a post-doctoral scientist at Stanford University (2009) and in Kyoto University (2010). Prof. Lignos teaches graduate and undergraduate courses in seismic design, nonlinear behaviour of steel and composite structures as well as supplemental damping systems, Structural Stability, Nonlinear Analysis and Performance-based Earthquake Engineering. His awards for teaching, research and service in Civil Engineering include the 2011 Outstanding Teaching Award (Faculty of Engineering, McGill University), as well as the Outstanding reviewer (2012, 2013) award from ASCE, the 2013 State-of-the-Art in Civil Engineering Award by ASCE and the 2014 Christophe Pierre Award for Research Excellence - Early Career. Just recently, he received the 2019 Walter L. Huber Civil Engineering Research Prize from ASCE for significant contributions in developing state of the art methods to simulate extreme limit states in steel structures.Prof. Lignos is a member of ASCE and the Earthquake Engineering Research Institute. He acts as an Associate Editor for Metal Structures and Seismic Effects of the ASCE Journal of Structural Engineering. He joined the Editorial Board of Earthquake Spectra and Earthquake Engineering and Structural Dynamics International journals. He serves as an acting member of the CEN/TC 250/SC 8/WG 2 and has been selected as a member of the Project Team (PT2) for the Eurocode 8-Part 1 Current Revisions for Steel and Composite Structures. He is also a member of the Canadian Standards Association (CSA) S16 technical committee for Steel Structures. Prof. Lignos is involved as a NEHRP consultant in numerous research-to-practice projects related to the behaviour and nonlinear modelling and analysis of structures applicable to the engineering practice through the Applied Technology Council (ATC). Detailed Curriculum Vitae (last update September 2018)

Source officielle

Concepts associés (31)

Direct stiffness method

As one of the methods of structural analysis, the direct stiffness method, also known as the matrix stiffness method, is particularly suited for computer-automated analysis of complex structures including the statically indeterminate type. It is a matrix method that makes use of the members' stiffness relations for computing member forces and displacements in structures. The direct stiffness method is the most common implementation of the finite element method (FEM).

Stiffness matrix

In the finite element method for the numerical solution of elliptic partial differential equations, the stiffness matrix is a matrix that represents the system of linear equations that must be solved in order to ascertain an approximate solution to the differential equation. For simplicity, we will first consider the Poisson problem on some domain Ω, subject to the boundary condition u = 0 on the boundary of Ω. To discretize this equation by the finite element method, one chooses a set of basis functions {φ_1, .

Linear elasticity

Linear elasticity is a mathematical model of how solid objects deform and become internally stressed due to prescribed loading conditions. It is a simplification of the more general nonlinear theory of elasticity and a branch of continuum mechanics. The fundamental "linearizing" assumptions of linear elasticity are: infinitesimal strains or "small" deformations (or strains) and linear relationships between the components of stress and strain. In addition linear elasticity is valid only for stress states that do not produce yielding.

Finite element method in structural mechanics

The finite element method (FEM) is a powerful technique originally developed for numerical solution of complex problems in structural mechanics, and it remains the method of choice for complex systems. In the FEM, the structural system is modeled by a set of appropriate finite elements interconnected at discrete points called nodes. Elements may have physical properties such as thickness, coefficient of thermal expansion, density, Young's modulus, shear modulus and Poisson's ratio.

Module d'élasticité

Un module d'élasticité (ou module élastique ou module de conservation) est une grandeur intrinsèque d'un matériau, définie par le rapport d'une contrainte à la déformation élastique provoquée par cette contrainte. Les déformations étant sans dimension, les modules d'élasticité sont homogènes à une pression et leur unité SI est donc le pascal ; en pratique on utilise plutôt un multiple, le ou le . Le comportement élastique d'un matériau homogène isotrope et linéaire est caractérisé par deux modules (ou constantes) d'élasticité indépendants.

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Séances de cours associées (32)

Analyse des éléments finis: Mécanismes avancés en ingénierie

Fournit un aperçu de l'analyse des mécanismes avancés utilisant la méthode des éléments finis et l'analyse des éléments finis dans les applications d'ingénierie.

Développement d'éléments finis: ordre supérieur

Explore les éléments finis d'ordre supérieur, la famille lagrangienne et l'intégration numérique pour l'évaluation de la matrice de rigidité.

Méthode des éléments finis : formulation faible et méthode Galerkin

Explore la formulation faible et la méthode Galerkin dans les applications de la méthode des éléments finis, y compris les conditions limites et les systèmes linéaires d'équations.

Développement d'éléments finis : fonctions de base d'ordre supérieur

Explore les fonctions de base d'ordre supérieur dans le développement d'éléments finis et la précision des modèles.

Fondements de la mécanique structurelle

Couvre les bases de la mécanique structurale, y compris le traitement des barres comme ressorts, en utilisant la méthode des sections pour analyser les structures complexes, et en explorant la concentration de stress et le principe Sambhanans.

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Concepts associés (31)

Direct stiffness method

Stiffness matrix

Linear elasticity

Finite element method in structural mechanics

Module d'élasticité

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