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Détail de l'auteur
Auteur Gordon P. Warn
Documents disponibles écrits par cet auteur
Affiner la rechercheEstimating natural periods of steel plate shear wall frames / Shi Liu in Journal of structural engineering, Vol. 139 N° 1 (Janvier 2013)
[article]
in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 155–161
Titre : Estimating natural periods of steel plate shear wall frames Type de document : texte imprimé Auteurs : Shi Liu, Auteur ; Gordon P. Warn, Auteur ; Jeffrey W. Berman, Auteur Année de publication : 2013 Article en page(s) : pp. 155–161 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Steel plate shear walls Natural periods Approximate method Résumé : A steel plate shear wall (SPSW) with thin, unstiffened web plates is one type of seismic lateral force–resisting system that is gaining popularity. SPSWs are used in low to midrise building construction typically with two or more frames in each orthogonal direction to resist seismic loading combined with gravity framing. The SPSWs therefore control the lateral force response of the building and the building’s natural periods of vibration. For design of any seismic load–resisting system, an estimation of the building’s first-mode period is necessary to calculate seismic loads and estimate resulting frame drift. This paper presents a method for estimating the first three natural periods of a SPSW with nonuniform properties along its height, accounting for both shear and flexural deformations of the system. The proposed method approximates the SPSW frame as shear and flexural systems separately to determine corresponding frequencies and then combines these frequencies using Dunkerley’s equation. A comparison of periods estimated using the approximate method with those obtained from modal analysis of detailed finite-element models suggests that the proposed method is appropriate for estimating the first-mode period of SPSW frames. The proposed method could be valuable for refining the seismic design of these frames or for verifying the results of large, complex steel plate shear wall building models. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000610 [article] Estimating natural periods of steel plate shear wall frames [texte imprimé] / Shi Liu, Auteur ; Gordon P. Warn, Auteur ; Jeffrey W. Berman, Auteur . - 2013 . - pp. 155–161.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 155–161
Mots-clés : Steel plate shear walls Natural periods Approximate method Résumé : A steel plate shear wall (SPSW) with thin, unstiffened web plates is one type of seismic lateral force–resisting system that is gaining popularity. SPSWs are used in low to midrise building construction typically with two or more frames in each orthogonal direction to resist seismic loading combined with gravity framing. The SPSWs therefore control the lateral force response of the building and the building’s natural periods of vibration. For design of any seismic load–resisting system, an estimation of the building’s first-mode period is necessary to calculate seismic loads and estimate resulting frame drift. This paper presents a method for estimating the first three natural periods of a SPSW with nonuniform properties along its height, accounting for both shear and flexural deformations of the system. The proposed method approximates the SPSW frame as shear and flexural systems separately to determine corresponding frequencies and then combines these frequencies using Dunkerley’s equation. A comparison of periods estimated using the approximate method with those obtained from modal analysis of detailed finite-element models suggests that the proposed method is appropriate for estimating the first-mode period of SPSW frames. The proposed method could be valuable for refining the seismic design of these frames or for verifying the results of large, complex steel plate shear wall building models. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000610 Stability of elastomeric and lead-rubber seismic isolation bearings / Jared Weisman in Journal of structural engineering, Vol. 138 N° 2 (Fevrier 2012)
[article]
in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 215-223
Titre : Stability of elastomeric and lead-rubber seismic isolation bearings Type de document : texte imprimé Auteurs : Jared Weisman, Auteur ; Gordon P. Warn, Auteur Année de publication : 2012 Article en page(s) : pp. 215-223 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Base isolation Stability Elastomeric bearings Lead-rubber Résumé : Elastomeric and lead-rubber bearings are two commonly used types of seismic isolation devices. During seismic events, some of the bearings in an isolation system will be subjected to large axial compressive loads, caused by gravity plus overturning forces, accompanied by simultaneous large lateral displacements. However, the critical load capacity of elastomeric bearings has been shown to reduce with increasing lateral displacement. The design of isolation systems composed of these types of bearings therefore requires that stability at the maximum displacement be demonstrated. The current procedure to assess the stability uses a ratio of areas, referred to as the overlapping area method, to determine the critical load capacity at a given lateral displacement that must be greater than a combination of axial forces imposed on the bearing. Although the overlapping area method provides a simple means of calculating the critical load at a given lateral displacement, it lacks a rigorous theoretical basis and has not been experimentally verified for bearings with shape factors representative of those used for seismic isolation (i.e., 10–30) or for lead-rubber bearings. Experimental testing and detailed nonlinear finite element analysis were employed to investigate the critical load capacities of an elastomeric bearing and a lead-rubber bearing with shape factors of 10 and 12, respectively, at large lateral displacements. The results of these investigations showed the lead core has a negligible effect on the critical load over a range of lateral displacements corresponding to 150–280% shear strain in comparison with the elastomeric bearing. The overlapping area method is shown to conservatively estimate the critical load capacity of this bearing in comparison with the experimental results. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p215_s1?isAuthorized=no [article] Stability of elastomeric and lead-rubber seismic isolation bearings [texte imprimé] / Jared Weisman, Auteur ; Gordon P. Warn, Auteur . - 2012 . - pp. 215-223.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 215-223
Mots-clés : Base isolation Stability Elastomeric bearings Lead-rubber Résumé : Elastomeric and lead-rubber bearings are two commonly used types of seismic isolation devices. During seismic events, some of the bearings in an isolation system will be subjected to large axial compressive loads, caused by gravity plus overturning forces, accompanied by simultaneous large lateral displacements. However, the critical load capacity of elastomeric bearings has been shown to reduce with increasing lateral displacement. The design of isolation systems composed of these types of bearings therefore requires that stability at the maximum displacement be demonstrated. The current procedure to assess the stability uses a ratio of areas, referred to as the overlapping area method, to determine the critical load capacity at a given lateral displacement that must be greater than a combination of axial forces imposed on the bearing. Although the overlapping area method provides a simple means of calculating the critical load at a given lateral displacement, it lacks a rigorous theoretical basis and has not been experimentally verified for bearings with shape factors representative of those used for seismic isolation (i.e., 10–30) or for lead-rubber bearings. Experimental testing and detailed nonlinear finite element analysis were employed to investigate the critical load capacities of an elastomeric bearing and a lead-rubber bearing with shape factors of 10 and 12, respectively, at large lateral displacements. The results of these investigations showed the lead core has a negligible effect on the critical load over a range of lateral displacements corresponding to 150–280% shear strain in comparison with the elastomeric bearing. The overlapping area method is shown to conservatively estimate the critical load capacity of this bearing in comparison with the experimental results. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p215_s1?isAuthorized=no