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Détail de l'auteur
Auteur Joseph A. Main
Documents disponibles écrits par cet auteur
Affiner la recherchePerformance of steel moment connections under a column removal scenario / H. S. Lew in Journal of structural engineering, Vol. 139 N° 1 (Janvier 2013)
in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 98–107
Titre : Performance of steel moment connections under a column removal scenario : I: Experiments Type de document : texte imprimé Auteurs : H. S. Lew, Auteur ; Joseph A. Main, Auteur ; Stephen D. Robert, Auteur Année de publication : 2013 Article en page(s) : pp. 98–107 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Buildings Connections Full-scale tests Progressive collapse Seismic design Steel structures Résumé : This paper presents an experimental study of two full-scale steel beam-column assemblies, each comprising three columns and two beams, to (1) define their response characteristics under a column-removal scenario, including the capacity of the beams and their connections to carry loads through catenary action, and (2) provide experimental data for validation of beam-to-column connection models for assessing the robustness of structural systems. The assemblies represent portions of the exterior moment-resisting frames of two 10-story steel-frame buildings. One test specimen had welded unreinforced flange, bolted web connections, and the other had reduced beam–section connections. When subjected to monotonically increasing vertical displacement of the unsupported center column, both specimens exhibited an initial elastic response dominated by flexure. With increased vertical displacement, the connections yielded, and axial tension developed in the beams. The axial tension in the beams increased until the connections failed under combined bending and axial stresses. The test results show that the rotational capacities of both connections under monotonic column displacement are about twice as large as those based on seismic-test data. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000618 [article] Performance of steel moment connections under a column removal scenario : I: Experiments [texte imprimé] / H. S. Lew, Auteur ; Joseph A. Main, Auteur ; Stephen D. Robert, Auteur . - 2013 . - pp. 98–107.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 98–107
Mots-clés : Buildings Connections Full-scale tests Progressive collapse Seismic design Steel structures Résumé : This paper presents an experimental study of two full-scale steel beam-column assemblies, each comprising three columns and two beams, to (1) define their response characteristics under a column-removal scenario, including the capacity of the beams and their connections to carry loads through catenary action, and (2) provide experimental data for validation of beam-to-column connection models for assessing the robustness of structural systems. The assemblies represent portions of the exterior moment-resisting frames of two 10-story steel-frame buildings. One test specimen had welded unreinforced flange, bolted web connections, and the other had reduced beam–section connections. When subjected to monotonically increasing vertical displacement of the unsupported center column, both specimens exhibited an initial elastic response dominated by flexure. With increased vertical displacement, the connections yielded, and axial tension developed in the beams. The axial tension in the beams increased until the connections failed under combined bending and axial stresses. The test results show that the rotational capacities of both connections under monotonic column displacement are about twice as large as those based on seismic-test data. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000618
in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 108–119
Titre : Performance of steel moment connections under a column removal scenario : II: Analysis Type de document : texte imprimé Auteurs : Sadek, Fahim, Auteur ; Joseph A. Main, Auteur ; H. S. Lew, Auteur Année de publication : 2013 Article en page(s) : pp. 108–119 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Buildings Connections FEM Nonlinear analysis Progressive collapse Seismic design Steel structures Résumé : This paper presents a computational investigation of the response of steel beam-column assemblies with moment connections under monotonic loading conditions simulating a column removal scenario. Two beam-column assemblies are analyzed, which incorporate (1) welded unreinforced flange bolted web connections, and (2) reduced beam section connections. Detailed models of the assemblies are developed, which use highly refined solid and shell elements to represent nonlinear material behavior and fracture. Reduced models are also developed, which use a much smaller number of beam and spring elements and are intended for use in future studies to assess the vulnerability of complete structural systems to disproportionate collapse. The two modeling approaches are described, and computational results are compared with the results of the full-scale tests described in the companion paper. Good agreement is observed, demonstrating that both the detailed and reduced models are capable of capturing the predominant response characteristics and failure modes of the assemblies, including the development of tensile forces associated with catenary action and the ultimate failure of the moment connections under combined bending and axial stresses. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000617 [article] Performance of steel moment connections under a column removal scenario : II: Analysis [texte imprimé] / Sadek, Fahim, Auteur ; Joseph A. Main, Auteur ; H. S. Lew, Auteur . - 2013 . - pp. 108–119.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 108–119
Mots-clés : Buildings Connections FEM Nonlinear analysis Progressive collapse Seismic design Steel structures Résumé : This paper presents a computational investigation of the response of steel beam-column assemblies with moment connections under monotonic loading conditions simulating a column removal scenario. Two beam-column assemblies are analyzed, which incorporate (1) welded unreinforced flange bolted web connections, and (2) reduced beam section connections. Detailed models of the assemblies are developed, which use highly refined solid and shell elements to represent nonlinear material behavior and fracture. Reduced models are also developed, which use a much smaller number of beam and spring elements and are intended for use in future studies to assess the vulnerability of complete structural systems to disproportionate collapse. The two modeling approaches are described, and computational results are compared with the results of the full-scale tests described in the companion paper. Good agreement is observed, demonstrating that both the detailed and reduced models are capable of capturing the predominant response characteristics and failure modes of the assemblies, including the development of tensile forces associated with catenary action and the ultimate failure of the moment connections under combined bending and axial stresses. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000617
in Journal of structural engineering > Vol. 137 N° 9 (Septembre 2011) . - pp. 881-892
Titre : Testing and analysis of steel and concrete beam-column assemblies under a column removal scenario Type de document : texte imprimé Auteurs : Sadek, Fahim, Auteur ; Joseph A. Main, Auteur ; H. S. Lew, Auteur Année de publication : 2011 Article en page(s) : pp. 881-892 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Buildings Concrete structures Finite-element method Full-scale tests Nonlinear analysis Progressive collapse Seismic design Steel structures Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an experimental and computational assessment of the performance of steel and reinforced concrete beam-column assemblies under monotonic vertical displacement of a center column, simulating a column removal scenario. The assemblies represent portions of structural framing systems designed as intermediate moment frames (IMFs) and special moment frames (SMFs) for Seismic Design Categories C and D, respectively. The steel IMF and SMF assemblies were designed in accordance with ANSI/AISC 341-02 by using prequalified moment connections specified in FEMA 350. The concrete IMF and SMF assemblies were designed and detailed in accordance with ACI 318-02 requirements. Each full-scale assembly comprises two beam spans and three columns, and downward displacements of the center column are imposed until failure. The study provides insight into the behavior and failure modes of the assemblies, including the development of catenary action. Both detailed and reduced finite-element models are developed, which capture the primary response characteristics and failure modes. Analyses with the reduced models can be executed rapidly without loss of accuracy, facilitating implementation in models of entire structural systems.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i9/p881_s1?bypassSSO=1 [article] Testing and analysis of steel and concrete beam-column assemblies under a column removal scenario [texte imprimé] / Sadek, Fahim, Auteur ; Joseph A. Main, Auteur ; H. S. Lew, Auteur . - 2011 . - pp. 881-892.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 137 N° 9 (Septembre 2011) . - pp. 881-892
Mots-clés : Buildings Concrete structures Finite-element method Full-scale tests Nonlinear analysis Progressive collapse Seismic design Steel structures Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an experimental and computational assessment of the performance of steel and reinforced concrete beam-column assemblies under monotonic vertical displacement of a center column, simulating a column removal scenario. The assemblies represent portions of structural framing systems designed as intermediate moment frames (IMFs) and special moment frames (SMFs) for Seismic Design Categories C and D, respectively. The steel IMF and SMF assemblies were designed in accordance with ANSI/AISC 341-02 by using prequalified moment connections specified in FEMA 350. The concrete IMF and SMF assemblies were designed and detailed in accordance with ACI 318-02 requirements. Each full-scale assembly comprises two beam spans and three columns, and downward displacements of the center column are imposed until failure. The study provides insight into the behavior and failure modes of the assemblies, including the development of catenary action. Both detailed and reduced finite-element models are developed, which capture the primary response characteristics and failure modes. Analyses with the reduced models can be executed rapidly without loss of accuracy, facilitating implementation in models of entire structural systems.
DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i9/p881_s1?bypassSSO=1
in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.369–378.
Titre : Vibration of tensioned beams with intermediate damper. I : formulation, influence of damper location Type de document : texte imprimé Auteurs : Joseph A. Main, Auteur ; Nicholas P. Jones, Auteur Année de publication : 2007 Article en page(s) : pp.369–378. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Vibration Damping Modal analysis Eigenvalues Beams Résumé : Exact analytical solutions are formulated for free vibrations of tensioned beams with an intermediate viscous damper. The dynamic stiffness method is used in the problem formulation, and characteristic equations are obtained for both clamped and pinned supports. The complex eigenfrequencies form loci in the complex plane that originate at the undamped eigenfrequencies and terminate at the eigenfrequencies of the fully locked system, in which the damper acts as an intermediate pin support. The fully locked eigenfrequencies exhibit “curve veering,” in which adjacent eigenfrequencies approach and then veer apart as the damper passes a node of an undamped mode shape. Consideration of the evolution of the eigenfrequency loci with varying damper location reveals three distinct regimes of behavior, which prevail from the taut-string limit to the case of a beam without tension. The second regime corresponds to damper locations near the first antinode of a given undamped mode shape; in this regime, the loci bend backwards to intersect the imaginary axis, and two distinct nonoscillatory decaying solutions emerge when the damper coefficient exceeds a critical value. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A4%2836 [...] [article] Vibration of tensioned beams with intermediate damper. I : formulation, influence of damper location [texte imprimé] / Joseph A. Main, Auteur ; Nicholas P. Jones, Auteur . - 2007 . - pp.369–378.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.369–378.
Mots-clés : Vibration Damping Modal analysis Eigenvalues Beams Résumé : Exact analytical solutions are formulated for free vibrations of tensioned beams with an intermediate viscous damper. The dynamic stiffness method is used in the problem formulation, and characteristic equations are obtained for both clamped and pinned supports. The complex eigenfrequencies form loci in the complex plane that originate at the undamped eigenfrequencies and terminate at the eigenfrequencies of the fully locked system, in which the damper acts as an intermediate pin support. The fully locked eigenfrequencies exhibit “curve veering,” in which adjacent eigenfrequencies approach and then veer apart as the damper passes a node of an undamped mode shape. Consideration of the evolution of the eigenfrequency loci with varying damper location reveals three distinct regimes of behavior, which prevail from the taut-string limit to the case of a beam without tension. The second regime corresponds to damper locations near the first antinode of a given undamped mode shape; in this regime, the loci bend backwards to intersect the imaginary axis, and two distinct nonoscillatory decaying solutions emerge when the damper coefficient exceeds a critical value. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A4%2836 [...]
in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.379–388.
Titre : Vibration of tensioned beams with intermediate damper. II : damper near a support Type de document : texte imprimé Auteurs : Joseph A. Main, Auteur ; Nicholas P. Jones, Auteur Année de publication : 2007 Article en page(s) : pp.379–388. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Vibration Damping Beams Cables Bridges cable-stayed Optimization Résumé : Analytical solutions are used to investigate the free vibrations of tensioned beams with a viscous damper attached transversely near a support. This problem is of particular relevance for stay-cable vibration suppression, but no restrictions on the level of axial load are introduced, and the results are quite broadly applicable. Characteristic equations for both clamped and pinned supports are rearranged into forms suitable for numerical solution by fixed-point iteration, whereby the complex eigenfrequencies and corresponding damping ratios can be accurately computed within a few iterations. Explicit asymptotic approximations for the complex eigenfrequencies are also obtained, subject to restrictions on the closeness of the eigenfrequencies to their undamped values. These asymptotic approximations are expressed in the same “universal” form identified in previous studies. It is observed that the maximum attainable modal damping ratios and the corresponding optimal values of the damper coefficient can be significantly affected by bending stiffness and by the nature of the support conditions, and a nondimensional parameter grouping is identified that enables an assessment of when bending stiffness should be considered. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A4%2837 [...] [article] Vibration of tensioned beams with intermediate damper. II : damper near a support [texte imprimé] / Joseph A. Main, Auteur ; Nicholas P. Jones, Auteur . - 2007 . - pp.379–388.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°4 (Avril 2007) . - pp.379–388.
Mots-clés : Vibration Damping Beams Cables Bridges cable-stayed Optimization Résumé : Analytical solutions are used to investigate the free vibrations of tensioned beams with a viscous damper attached transversely near a support. This problem is of particular relevance for stay-cable vibration suppression, but no restrictions on the level of axial load are introduced, and the results are quite broadly applicable. Characteristic equations for both clamped and pinned supports are rearranged into forms suitable for numerical solution by fixed-point iteration, whereby the complex eigenfrequencies and corresponding damping ratios can be accurately computed within a few iterations. Explicit asymptotic approximations for the complex eigenfrequencies are also obtained, subject to restrictions on the closeness of the eigenfrequencies to their undamped values. These asymptotic approximations are expressed in the same “universal” form identified in previous studies. It is observed that the maximum attainable modal damping ratios and the corresponding optimal values of the damper coefficient can be significantly affected by bending stiffness and by the nature of the support conditions, and a nondimensional parameter grouping is identified that enables an assessment of when bending stiffness should be considered. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A4%2837 [...]
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