Dynamic analysis of three-dimensional frames with material and geometric nonlinearities / M. Schachter in Journal of structural engineering, Vol. 137 N° 2 (Fevrier 2011)  

Public ISBD [article]  inJournal of structural engineering > Vol. 137 N° 2 (Fevrier 2011) . - pp. 207-219 Titre : Dynamic analysis of three-dimensional frames with material and geometric nonlinearities Type de document : texte imprimé Auteurs : M. Schachter, Auteur ; A. M. Reinhorn, Auteur Année de publication : 2011 Article en page(s) : pp. 207-219 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dynamic analysis Material nonlinearities Geometric Corotational approach State space Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The dynamic analysis of inelastic structures with geometric nonlinearities experiencing large deformations and buckling is challenging, in particular, if three-dimensional space effects are considered. This paper introduces a new formulation of a three-dimensional beam-column element and the associated analysis of the global frame system using a corotational approach formulated in the state space. The corotational approach may allow uncoupling of the local large deformations and inelastic buckling of the element from the large deformation of the global system. Shaking table testing performed by the authors on a steel frame model structure provides benchmark information for comparison with the proposed analytical formulation. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i2/p207_s1?isAuthorized=no [article] Dynamic analysis of three-dimensional frames with material and geometric nonlinearities [texte imprimé] / M. Schachter, Auteur ; A. M. Reinhorn, Auteur . - 2011 . - pp. 207-219. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 2 (Fevrier 2011) . - pp. 207-219 Mots-clés : Dynamic analysis Material nonlinearities Geometric Corotational approach State space Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The dynamic analysis of inelastic structures with geometric nonlinearities experiencing large deformations and buckling is challenging, in particular, if three-dimensional space effects are considered. This paper introduces a new formulation of a three-dimensional beam-column element and the associated analysis of the global frame system using a corotational approach formulated in the state space. The corotational approach may allow uncoupling of the local large deformations and inelastic buckling of the element from the large deformation of the global system. Shaking table testing performed by the authors on a steel frame model structure provides benchmark information for comparison with the proposed analytical formulation. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i2/p207_s1?isAuthorized=no

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Fragility analysis and seismic record selection / G. P. Cimellaro in Journal of structural engineering, Vol. 137 N° 3 (Mars 2011)  

Public ISBD [article]  inJournal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 379-390 Titre : Fragility analysis and seismic record selection Type de document : texte imprimé Auteurs : G. P. Cimellaro, Auteur ; A. M. Reinhorn, Auteur ; A. D’Ambrisi, Auteur Année de publication : 2011 Article en page(s) : pp. 379-390 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Damage Fragility functions Intensity measure Nonlinear analysis Record selection Uniform hazard spectrum Spectrum matching Stationary simulation Synthetic earthquakes Acceleration scaling Accelerograms Inelastic demand Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper explores the influence of spectrum-matched and amplitude-scaled ground motions on the development of fragility functions for structures. The quantification of the influence of these two types of ensembles on ground motions in predicting demands of structural and nonstructural systems is addressed. Moreover, the paper investigates the sensitivity of number of accelerograms in the ensembles, which produces consistent results in the nonlinear analyses. A multidegree-of-freedom (MDOF) inelastic shear-type building is used in the evaluations. The median and the dispersion of different types of damage measures are evaluated at each story and the effect of different levels of nonlinearity is investigated. Fragility functions are developed for structural and nonstructural components using the maximum likelihood method from the response generated with the selected ground motions. The sufficient number of ground motions necessary in the estimation of the response parameters and on the evaluation of the fragility functions is presented herein. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p379_s1?isAuthorized=no [article] Fragility analysis and seismic record selection [texte imprimé] / G. P. Cimellaro, Auteur ; A. M. Reinhorn, Auteur ; A. D’Ambrisi, Auteur . - 2011 . - pp. 379-390. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 379-390 Mots-clés : Damage Fragility functions Intensity measure Nonlinear analysis Record selection Uniform hazard spectrum Spectrum matching Stationary simulation Synthetic earthquakes Acceleration scaling Accelerograms Inelastic demand Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper explores the influence of spectrum-matched and amplitude-scaled ground motions on the development of fragility functions for structures. The quantification of the influence of these two types of ensembles on ground motions in predicting demands of structural and nonstructural systems is addressed. Moreover, the paper investigates the sensitivity of number of accelerograms in the ensembles, which produces consistent results in the nonlinear analyses. A multidegree-of-freedom (MDOF) inelastic shear-type building is used in the evaluations. The median and the dispersion of different types of damage measures are evaluated at each story and the effect of different levels of nonlinearity is investigated. Fragility functions are developed for structural and nonstructural components using the maximum likelihood method from the response generated with the selected ground motions. The sufficient number of ground motions necessary in the estimation of the response parameters and on the evaluation of the fragility functions is presented herein. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p379_s1?isAuthorized=no

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Multidimensional performance limit state for hazard fragility functions / G. P. Cimellaro in Journal of engineering mechanics, Vol. 137 N° 1 (Janvier 2011)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.47-60 Titre : Multidimensional performance limit state for hazard fragility functions Type de document : texte imprimé Auteurs : G. P. Cimellaro, Auteur ; A. M. Reinhorn, Auteur Année de publication : 2011 Article en page(s) : pp.47-60 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Hazards Limit states Structural reliability Rehabilitation Safety California Health care facilities. Résumé : This paper addresses an alternative methodology to calculate fragility functions that considers multiple limit states parameters, such as combinations of response variables of accelerations and interstory drifts. Limit states are defined using a generalized multidimensional limit states function that allows considering dependencies among limit thresholds modeled as random variables in the calculation of fragility curves that are evaluated as function of the return period. A California hospital is used as example to illustrate the proposed approach for developing fragility curves. The study investigates the sensitivity of the proposed approach for evaluating fragility curves when uncertainties in limit states are considered. Influence of structural and response parameters, such as stiffness, damping, acceleration and displacement thresholds, ground motion input, and uncertainties in structural modeling, are also investigated. The proposed approach can be considered as an alternative approach for describing the vulnerable behavior of nonstructural components that are sensitive to multiple parameters such as displacements and accelerations (e.g., partition walls, piping systems, etc.). DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p47_s1?isAuthorized=no [article] Multidimensional performance limit state for hazard fragility functions [texte imprimé] / G. P. Cimellaro, Auteur ; A. M. Reinhorn, Auteur . - 2011 . - pp.47-60. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.47-60 Mots-clés : Hazards Limit states Structural reliability Rehabilitation Safety California Health care facilities. Résumé : This paper addresses an alternative methodology to calculate fragility functions that considers multiple limit states parameters, such as combinations of response variables of accelerations and interstory drifts. Limit states are defined using a generalized multidimensional limit states function that allows considering dependencies among limit thresholds modeled as random variables in the calculation of fragility curves that are evaluated as function of the return period. A California hospital is used as example to illustrate the proposed approach for developing fragility curves. The study investigates the sensitivity of the proposed approach for evaluating fragility curves when uncertainties in limit states are considered. Influence of structural and response parameters, such as stiffness, damping, acceleration and displacement thresholds, ground motion input, and uncertainties in structural modeling, are also investigated. The proposed approach can be considered as an alternative approach for describing the vulnerable behavior of nonstructural components that are sensitive to multiple parameters such as displacements and accelerations (e.g., partition walls, piping systems, etc.). DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p47_s1?isAuthorized=no

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

Public ISBD [article]  inEarthquake 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 : O. Lavan, Auteur ; Sivaselvan, M. V., Auteur ; A. M. Reinhorn, 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  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] / O. Lavan, Auteur ; Sivaselvan, M. V., Auteur ; A. M. Reinhorn, 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  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

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