Documents disponibles écrits par cet auteur

Numerical collapse simulation of large-scale structural systems using an optimization-based algorithm / Sivaselvan, Mettupalayam V. in Earthquake engineering structural dynamics, Vol. 38 N°5 (Avril 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N°5 (Avril 2009) . - pp. 655-677 Titre : Numerical collapse simulation of large-scale structural systems using an optimization-based algorithm Type de document : texte imprimé Auteurs : Sivaselvan, Mettupalayam V., Auteur ; Oren Lavan, Auteur ; Dargush, G. F., Auteur Article en page(s) : pp. 655-677 Note générale : Génie Cicil Langues : Anglais (eng) Mots-clés : nonlinear  dynamic  simulation  •  convex  optimization  •  generalized  standard  material  •  stored  energy  •  dissipation  potential  •  mixed  Lagrangian  formalism Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A new algorithm for nonlinear dynamic simulation of structures is presented. The algorithm is based on a mixed Lagrangian approach described by Sivaselvan and Reinhorn (J. Eng. Mech. (ASCE) 2006; 132(8):795-805). The algorithm developed in this paper is for the simulation of large-scale structural systems. The algorithm is applicable to a wide class of structural systems whose constituent material or component behavior can be derived from a stored energy function and a dissipation potential. The algorithm is based on the fact that for such systems, when using a certain class of time-discretization schemes to numerically compute the system response, the incremental problem of computing the system state at the next sample time knowing the current state and the input is one of convex minimization. As a result, the algorithm possesses excellent convergence characteristics. It is also applicable to geometric nonlinear problems. The implementation of the algorithm is described, and its applicability to the collapse analysis of large-scale structures is demonstrated through numerical examples. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121676918/abstract [article] Numerical collapse simulation of large-scale structural systems using an optimization-based algorithm [texte imprimé] / Sivaselvan, Mettupalayam V., Auteur ; Oren Lavan, Auteur ; Dargush, G. F., Auteur . - pp. 655-677. Génie Cicil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°5 (Avril 2009) . - pp. 655-677 Mots-clés : nonlinear  dynamic  simulation  •  convex  optimization  •  generalized  standard  material  •  stored  energy  •  dissipation  potential  •  mixed  Lagrangian  formalism Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A new algorithm for nonlinear dynamic simulation of structures is presented. The algorithm is based on a mixed Lagrangian approach described by Sivaselvan and Reinhorn (J. Eng. Mech. (ASCE) 2006; 132(8):795-805). The algorithm developed in this paper is for the simulation of large-scale structural systems. The algorithm is applicable to a wide class of structural systems whose constituent material or component behavior can be derived from a stored energy function and a dissipation potential. The algorithm is based on the fact that for such systems, when using a certain class of time-discretization schemes to numerically compute the system response, the incremental problem of computing the system state at the next sample time knowing the current state and the input is one of convex minimization. As a result, the algorithm possesses excellent convergence characteristics. It is also applicable to geometric nonlinear problems. The implementation of the algorithm is described, and its applicability to the collapse analysis of large-scale structures is demonstrated through numerical examples. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121676918/abstract

Progressive collapse analysis through strength degradation and fracture in the mixed lagrangian formulation / Lavan, O. in Earthquake engineering structural dynamics, Vol. 38 N° 13 (Octobre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 13 (Octobre 2009) . - pp. 1483-1504 Titre : Progressive collapse analysis through strength degradation and fracture in the mixed lagrangian formulation Type de document : texte imprimé Auteurs : Lavan, O., Auteur ; Sivaselvan, M. V., Auteur ; Reinhorn, A. M., Auteur ; Dargush, G. F. Article en page(s) : pp. 1483-1504 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Nonlinear  structural  dynamics;  fracture;  Deterioration;  Mixed  Lagrangian  Formulation;  Mixed  variational  method Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The dynamic analysis of progressive collapse faces a great number of obstacles that often lead to the collapse of the analysis prior to the actual analysis of collapse. Hence, the Mixed Lagrangian Formulation that has been shown to be very robust was adopted as a framework to accommodate such analysis. By modifying the loading function and the numerical scheme, the capabilities of this framework were extended to account for strength degradation and fracture, while some insight to its behavior is introduced as well. The examples presented show a very robust and stable behavior of the numerical scheme in terms of the time step size required, even in cases where a sudden fracture takes place. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Progressive collapse analysis through strength degradation and fracture in the mixed lagrangian formulation [texte imprimé] / Lavan, O., Auteur ; Sivaselvan, M. V., Auteur ; Reinhorn, A. M., Auteur ; Dargush, G. F. . - pp. 1483-1504. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 13 (Octobre 2009) . - pp. 1483-1504 Mots-clés : Nonlinear  structural  dynamics;  fracture;  Deterioration;  Mixed  Lagrangian  Formulation;  Mixed  variational  method Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The dynamic analysis of progressive collapse faces a great number of obstacles that often lead to the collapse of the analysis prior to the actual analysis of collapse. Hence, the Mixed Lagrangian Formulation that has been shown to be very robust was adopted as a framework to accommodate such analysis. By modifying the loading function and the numerical scheme, the capabilities of this framework were extended to account for strength degradation and fracture, while some insight to its behavior is introduced as well. The examples presented show a very robust and stable behavior of the numerical scheme in terms of the time step size required, even in cases where a sudden fracture takes place. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe