Inelastic deformation of extended pile - shafts / Y. H. Chai in Journal of engineering mechanics, Vol. 138 N° 7 (Juillet 2012)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.842–852. Titre : Inelastic deformation of extended pile - shafts Type de document : texte imprimé Auteurs : Y. H. Chai, Auteur ; Shin-Tai Song, Auteur Année de publication : 2012 Article en page(s) : pp.842–852. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Soil-pile interaction Ductility Extended pile-shafts Soil p-y curves Résumé : Seismic performance of extended pile-shafts depends not only on the intensity of the earthquake ground motion, but also on the pile structural properties and the soil conditions surrounding the pile. For assurance of good foundation performance, damage can be controlled by limiting the curvature ductility demand in the yielding region of the pile. However, curvature ductility demand is influenced by the strength and stiffness of the pile and the soil, and the ability of the soil-pile system to distribute the inelastic deformation in the pile. The pile curvature distribution can be written in the form of a nonlinear differential equation, including the effects of the pile yielding, soil nonlinearity, and secondary P−Δ moment arising from the axial load. A solution to the differential equation lends itself to the pile deflection, pile internal forces, soil pressure distribution, and, more importantly, the inelastic curvature distribution in the pile. The overall response in terms of a lateral force versus lateral displacement curve, and a kinematic relationship between the displacement ductility and curvature ductility factors, are computed as part of the solution. The proposed model is shown to provide good agreement with a finite-element model. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000393 [article] Inelastic deformation of extended pile - shafts [texte imprimé] / Y. H. Chai, Auteur ; Shin-Tai Song, Auteur . - 2012 . - pp.842–852. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.842–852. Mots-clés : Soil-pile interaction Ductility Extended pile-shafts Soil p-y curves Résumé : Seismic performance of extended pile-shafts depends not only on the intensity of the earthquake ground motion, but also on the pile structural properties and the soil conditions surrounding the pile. For assurance of good foundation performance, damage can be controlled by limiting the curvature ductility demand in the yielding region of the pile. However, curvature ductility demand is influenced by the strength and stiffness of the pile and the soil, and the ability of the soil-pile system to distribute the inelastic deformation in the pile. The pile curvature distribution can be written in the form of a nonlinear differential equation, including the effects of the pile yielding, soil nonlinearity, and secondary P−Δ moment arising from the axial load. A solution to the differential equation lends itself to the pile deflection, pile internal forces, soil pressure distribution, and, more importantly, the inelastic curvature distribution in the pile. The overall response in terms of a lateral force versus lateral displacement curve, and a kinematic relationship between the displacement ductility and curvature ductility factors, are computed as part of the solution. The proposed model is shown to provide good agreement with a finite-element model. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000393

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