Dépouillements

Alternative non-linear demand estimation methods for probability-based seismic assessments / Jalayer, F. in Earthquake engineering structural dynamics, Vol. 38 N° 8 (Juillet 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 951-972 Titre : Alternative non-linear demand estimation methods for probability-based seismic assessments Type de document : texte imprimé Auteurs : Jalayer, F., Auteur ; C. A. Cornell, Auteur Article en page(s) : pp. 951-972 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Probabilistic  seismic  assessments  ;Non-linear  dynamic  analysis  ;  Demand  and  capacity  factored  design;  Global  instability  ;  Multiple-stripe  analysis;  Performance-based  design;  Earthquake  engineering Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Alternative non-linear dynamic analysis procedures, using real ground motion records, can be used to make probability-based seismic assessments. These procedures can be used both to obtain parameter estimates for specific probabilistic assessment criteria such as demand and capacity factored design and also to make direct probabilistic performance assessments using numerical methods. Multiple-stripe analysis is a non-linear dynamic analysis method that can be used for performance-based assessments for a wide range of ground motion intensities and multiple performance objectives from onset of damage through global collapse. Alternatively, the amount of analysis effort needed in the performance assessments can be reduced by performing the structural analyses and estimating the main parameters in the region of ground motion intensity levels of interest. In particular, single-stripe and double-stripe analysis can provide local probabilistic demand assessments using minimal number of structural analyses (around 20 to 40). As a case study, the displacement-based seismic performance of an older reinforced concrete frame structure, which is known to have suffered shear failure in its columns during the 1994 Northridge Earthquake, is evaluated. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121542181/abstract [article] Alternative non-linear demand estimation methods for probability-based seismic assessments [texte imprimé] / Jalayer, F., Auteur ; C. A. Cornell, Auteur . - pp. 951-972. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 951-972 Mots-clés : Probabilistic  seismic  assessments  ;Non-linear  dynamic  analysis  ;  Demand  and  capacity  factored  design;  Global  instability  ;  Multiple-stripe  analysis;  Performance-based  design;  Earthquake  engineering Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Alternative non-linear dynamic analysis procedures, using real ground motion records, can be used to make probability-based seismic assessments. These procedures can be used both to obtain parameter estimates for specific probabilistic assessment criteria such as demand and capacity factored design and also to make direct probabilistic performance assessments using numerical methods. Multiple-stripe analysis is a non-linear dynamic analysis method that can be used for performance-based assessments for a wide range of ground motion intensities and multiple performance objectives from onset of damage through global collapse. Alternatively, the amount of analysis effort needed in the performance assessments can be reduced by performing the structural analyses and estimating the main parameters in the region of ground motion intensity levels of interest. In particular, single-stripe and double-stripe analysis can provide local probabilistic demand assessments using minimal number of structural analyses (around 20 to 40). As a case study, the displacement-based seismic performance of an older reinforced concrete frame structure, which is known to have suffered shear failure in its columns during the 1994 Northridge Earthquake, is evaluated. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121542181/abstract

Alternative non-linear demand estimation methods for probability-based seismic assessments / Jalayer, F. in Earthquake engineering structural dynamics, Vol. 38 N° 8 (Juillet 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 951-972 Titre : Alternative non-linear demand estimation methods for probability-based seismic assessments Type de document : texte imprimé Auteurs : Jalayer, F., Auteur ; C. A. Cornell, Auteur Article en page(s) : pp. 951-972 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Probabilistic  seismic  assessments;  Non-linear  dynamic  analysis  ;  Demand  and  capacity  factored  design;  Global  instability  ;  Multiple-stripe  analysis;  Performance-based  design;  Earthquake  engineering Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Alternative non-linear dynamic analysis procedures, using real ground motion records, can be used to make probability-based seismic assessments. These procedures can be used both to obtain parameter estimates for specific probabilistic assessment criteria such as demand and capacity factored design and also to make direct probabilistic performance assessments using numerical methods. Multiple-stripe analysis is a non-linear dynamic analysis method that can be used for performance-based assessments for a wide range of ground motion intensities and multiple performance objectives from onset of damage through global collapse. Alternatively, the amount of analysis effort needed in the performance assessments can be reduced by performing the structural analyses and estimating the main parameters in the region of ground motion intensity levels of interest. In particular, single-stripe and double-stripe analysis can provide local probabilistic demand assessments using minimal number of structural analyses (around 20 to 40). As a case study, the displacement-based seismic performance of an older reinforced concrete frame structure, which is known to have suffered shear failure in its columns during the 1994 Northridge Earthquake, is evaluated. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121542181/abstract [article] Alternative non-linear demand estimation methods for probability-based seismic assessments [texte imprimé] / Jalayer, F., Auteur ; C. A. Cornell, Auteur . - pp. 951-972. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 951-972 Mots-clés : Probabilistic  seismic  assessments;  Non-linear  dynamic  analysis  ;  Demand  and  capacity  factored  design;  Global  instability  ;  Multiple-stripe  analysis;  Performance-based  design;  Earthquake  engineering Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Alternative non-linear dynamic analysis procedures, using real ground motion records, can be used to make probability-based seismic assessments. These procedures can be used both to obtain parameter estimates for specific probabilistic assessment criteria such as demand and capacity factored design and also to make direct probabilistic performance assessments using numerical methods. Multiple-stripe analysis is a non-linear dynamic analysis method that can be used for performance-based assessments for a wide range of ground motion intensities and multiple performance objectives from onset of damage through global collapse. Alternatively, the amount of analysis effort needed in the performance assessments can be reduced by performing the structural analyses and estimating the main parameters in the region of ground motion intensity levels of interest. In particular, single-stripe and double-stripe analysis can provide local probabilistic demand assessments using minimal number of structural analyses (around 20 to 40). As a case study, the displacement-based seismic performance of an older reinforced concrete frame structure, which is known to have suffered shear failure in its columns during the 1994 Northridge Earthquake, is evaluated. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121542181/abstract

Sensitivity of seismically isolated structures / Politopoulos, Ioannis in Earthquake engineering structural dynamics, Vol. 38 N° 8 (Juillet 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 989-1007 Titre : Sensitivity of seismically isolated structures Type de document : texte imprimé Auteurs : Politopoulos, Ioannis, Auteur ; Hoan Khac Pham, Auteur Article en page(s) : pp. 989-1007 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic  isolation;  vulnerability;  Failure  probability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In this paper we study the sensitivity of seismically isolated structures to a small variability of the earthquake excitation and of some structural properties with respect to the probability of failure and floor spectra. In particular, the influence of the nonlinear behaviour of the isolated superstructure on the vulnerability and on the floor spectra is investigated by means of a series of Monte Carlo simulations of simple two degrees-of-freedom systems. Several types of passive and active isolation systems are examined and three different idealized nonlinear constitutive laws are considered for the superstructure. It is found that, in general, the probability of failure does not depend on the specific cyclic behaviour of the assumed constitutive law and general trends regarding the impact of different isolation devices on vulnerability are established. As for the floor spectra, the influence of moderate nonlinear behaviour of isolated superstructures, with the exception of the case of a non-dissipative elastic nonlinear law, is negligible, contrary to the case of conventional structures. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121560455/abstract [article] Sensitivity of seismically isolated structures [texte imprimé] / Politopoulos, Ioannis, Auteur ; Hoan Khac Pham, Auteur . - pp. 989-1007. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 989-1007 Mots-clés : Seismic  isolation;  vulnerability;  Failure  probability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In this paper we study the sensitivity of seismically isolated structures to a small variability of the earthquake excitation and of some structural properties with respect to the probability of failure and floor spectra. In particular, the influence of the nonlinear behaviour of the isolated superstructure on the vulnerability and on the floor spectra is investigated by means of a series of Monte Carlo simulations of simple two degrees-of-freedom systems. Several types of passive and active isolation systems are examined and three different idealized nonlinear constitutive laws are considered for the superstructure. It is found that, in general, the probability of failure does not depend on the specific cyclic behaviour of the assumed constitutive law and general trends regarding the impact of different isolation devices on vulnerability are established. As for the floor spectra, the influence of moderate nonlinear behaviour of isolated superstructures, with the exception of the case of a non-dissipative elastic nonlinear law, is negligible, contrary to the case of conventional structures. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121560455/abstract

A study on using pre-bent steel strips as seismic energy-dissipative devices / Yen-Po Wang in Earthquake engineering structural dynamics, Vol. 38 N° 8 (Juillet 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 1009-1026 Titre : A study on using pre-bent steel strips as seismic energy-dissipative devices Type de document : texte imprimé Auteurs : Yen-Po Wang, Auteur ; Chia-Shang Chang Chien, Auteur Article en page(s) : pp. 1009-1026 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Buckling;  Pre-bent  strip;  Buckling-type  energy-dissipative  damper;  Hysteretic  loops;  Shaking  table  test Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Buckling is usually conceived as an unstable structural behavior leading to lateral instability of axially loaded members, if not properly supported. However, a pre-bent strip would become an excellent seismic energy-dissipative device if it is deformed in a guided direction and range. Geometrically large lateral deformation of the steel strips in buckling leads to inelastic behavior of the material and dissipates energy as a consequence. The purpose of this study is to propose a new type of seismic damper in the form of braces based on pre-bent steel strips. The nonlinear elastic stiffness of monotonously loaded pre-bent strips in both compression and tension is derived. The energy-dissipative characteristics of the proposed damping device are investigated via component tests under cyclic loads. Experimental results indicate that the force-displacement relationship of pre-bent strips in cyclic loads exhibits mechanical characteristics of displacement-dependent dampers. A series of seismic performance tests has been conducted further to verify the feasibility and effectiveness of using the proposed device as seismic dampers. Encouraging test results have been obtained, suggesting feasibility of the proposed device for earthquake-resistant design. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121561868/abstract [article] A study on using pre-bent steel strips as seismic energy-dissipative devices [texte imprimé] / Yen-Po Wang, Auteur ; Chia-Shang Chang Chien, Auteur . - pp. 1009-1026. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 1009-1026 Mots-clés : Buckling;  Pre-bent  strip;  Buckling-type  energy-dissipative  damper;  Hysteretic  loops;  Shaking  table  test Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Buckling is usually conceived as an unstable structural behavior leading to lateral instability of axially loaded members, if not properly supported. However, a pre-bent strip would become an excellent seismic energy-dissipative device if it is deformed in a guided direction and range. Geometrically large lateral deformation of the steel strips in buckling leads to inelastic behavior of the material and dissipates energy as a consequence. The purpose of this study is to propose a new type of seismic damper in the form of braces based on pre-bent steel strips. The nonlinear elastic stiffness of monotonously loaded pre-bent strips in both compression and tension is derived. The energy-dissipative characteristics of the proposed damping device are investigated via component tests under cyclic loads. Experimental results indicate that the force-displacement relationship of pre-bent strips in cyclic loads exhibits mechanical characteristics of displacement-dependent dampers. A series of seismic performance tests has been conducted further to verify the feasibility and effectiveness of using the proposed device as seismic dampers. Encouraging test results have been obtained, suggesting feasibility of the proposed device for earthquake-resistant design. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121561868/abstract

Global damage indexes for the seismic performance assessement of RC structures / Roberto Scotta in Earthquake engineering structural dynamics, Vol. 38 N° 8 (Juillet 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 1027-1049 Titre : Global damage indexes for the seismic performance assessement of RC structures Type de document : texte imprimé Auteurs : Roberto Scotta, Auteur ; Leopoldo Tesser, Auteur ; Renato Vitaliani, Auteur Article en page(s) : pp. 1027-1049 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic  assessme;  Nonlinear  analysis;  Bar  buckling;  Bamage  indexes;  Fibers  approach Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : When performing the seismic risk assessment of new or existing buildings, the definition of compact indexes able to measure the damaging and safety level of structures is essential, also in view of the economic considerations on buildings rehabilitation. This paper proposes two series of indexes, named, respectively, Global Damage Indexes (GDIs), which are representative of the overall structure performance, and Section Damage Indexes (SDIs), which assess the conditions of reinforced concrete (RC) beam-column sections. Such indexes are evaluated by means of an efficient numerical model able to perform nonlinear analyses of the RC frame, based on the continuum damage mechanics theory and fiber approach. An improvement of a two-parameter damage model for concrete, developed by some of the authors, which guarantees a better correlation between the Local Damage Indexes (LDIs) and the material's mechanical characteristics, is also presented. For the reinforcement, a specific LDI, named steel damage index, which takes into account the plastic strain development and the bar buckling effect, is proposed. The numerical model has been employed to simulate several experimental tests, in order to verify the accuracy of the proposed approach in predicting the RC member's behavior. Nonlinear static and dynamic analyses of two RC frames are carried out. The robustness of the method, as well as the effectiveness of the GDIs in assessing the structural conditions, are demonstrated here. Finally, comparisons between the evolution of GDIs and the achievement of the performance levels as proposed in FEMA 356 are reported. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121640226/abstract [article] Global damage indexes for the seismic performance assessement of RC structures [texte imprimé] / Roberto Scotta, Auteur ; Leopoldo Tesser, Auteur ; Renato Vitaliani, Auteur . - pp. 1027-1049. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 1027-1049 Mots-clés : Seismic  assessme;  Nonlinear  analysis;  Bar  buckling;  Bamage  indexes;  Fibers  approach Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : When performing the seismic risk assessment of new or existing buildings, the definition of compact indexes able to measure the damaging and safety level of structures is essential, also in view of the economic considerations on buildings rehabilitation. This paper proposes two series of indexes, named, respectively, Global Damage Indexes (GDIs), which are representative of the overall structure performance, and Section Damage Indexes (SDIs), which assess the conditions of reinforced concrete (RC) beam-column sections. Such indexes are evaluated by means of an efficient numerical model able to perform nonlinear analyses of the RC frame, based on the continuum damage mechanics theory and fiber approach. An improvement of a two-parameter damage model for concrete, developed by some of the authors, which guarantees a better correlation between the Local Damage Indexes (LDIs) and the material's mechanical characteristics, is also presented. For the reinforcement, a specific LDI, named steel damage index, which takes into account the plastic strain development and the bar buckling effect, is proposed. The numerical model has been employed to simulate several experimental tests, in order to verify the accuracy of the proposed approach in predicting the RC member's behavior. Nonlinear static and dynamic analyses of two RC frames are carried out. The robustness of the method, as well as the effectiveness of the GDIs in assessing the structural conditions, are demonstrated here. Finally, comparisons between the evolution of GDIs and the achievement of the performance levels as proposed in FEMA 356 are reported. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121640226/abstract

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