000013321 001__ 13321
000013321 005__ 20161114160336.0
000013321 04107 $$aeng
000013321 046__ $$k2009-06-22
000013321 100__ $$aGerolymos, N.
000013321 24500 $$aOn the beneficial role of pile and soil inelasticity on the seismic performance of bridge piers

000013321 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013321 260__ $$bNational Technical University of Athens, 2009
000013321 506__ $$arestricted
000013321 520__ $$2eng$$aWhile seismic codes do not allow plastic deformation of piles, the Kobe earthquake has shown that limited structural yielding and cracking of piles may not be always detrimental. As a first attempt to investigate the consequences of pile yielding in the response of a pile–column supported bridge structure, this paper explores the soil–pile–bridge pier interaction to seismic loading, with emphasis on structural nonlinearity. The pile-soil interaction is modeled through distributed nonlinear Winkler-type springs and dashpots. Numerical analysis is performed with a constitutive model (Gerolymos and Gazetas, 2005a; 2005b; 2006a) materialized in the OpenSees finite element code (Mazzoni et al, 2005) which can simulate: the nonlinear behaviour of both pile and soil; the possible separation and gapping between pile and soil; radiation damping ; loss of stiffness and strength in pile and soil. The model is applied to the analysis of pile-column supported bridge structures, focusing on the influence of soil compliance, intensity of seismic excitation, pile diameter, above–ground height of the pile, and above or below ground development of plastic hinge, on key performance measures of the pier as is: the displacement (global) and curvature (local) ductility demands. It is shown that both pile and soil inelasticity may be beneficial for the performance of the superstructure. Moreover, kinematic expressions for performance measure parameters may lead to erroneous results when soil–structure interaction is considered.

000013321 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013321 653__ $$aDynamic soil–Structure Interaction, Soil and pile inelasticity, Seismic performance measures, Extended pile shaft – supported bridge. Abstract. While seismic codes do not allow plastic deformation of piles, the Kobe earthquake has shown that limited structural yielding and cracking of piles may not be always detrimental. As a first attempt to investigate the consequences of pile yielding in the response of a pile–column supported bridge structure, this paper explores the soil–pile–bridge pier interaction to seismic loading, with emphasis on structural nonlinearity. The pile-soil interaction is modeled through distributed nonlinear Winkler-type springs and dashpots. Numerical analysis is performed with a constitutive model (Gerolymos and Gazetas, 2005a; 2005b; 2006a) materialized in the OpenSees finite element code (Mazzoni et al, 2005) which can simulate: the nonlinear behaviour of both pile and soil; the possible separation and gapping between pile and soil; radiation damping ; loss of stiffness and strength in pile and soil. The model is applied to the analysis of pile-column supported bridge structures, focusing on the influence of soil compliance, intensity of seismic excitation, pile diameter, above–ground height of the pile, and above or below ground development of plastic hinge, on key performance measures of the pier as is: the displacement (global) and curvature (local) ductility demands. It is shown that both pile and soil inelasticity may be beneficial for the performance of the superstructure. Moreover, kinematic expressions for performance measure parameters may lead to erroneous results when soil–structure interaction is considered.

000013321 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013321 720__ $$aGerolymos, N.$$iDrosos, V.$$iGazetas, G.
000013321 8560_ $$ffischerc@itam.cas.cz
000013321 8564_ $$s753281$$uhttps://invenio.itam.cas.cz/record/13321/files/CD469.pdf$$yOriginal version of the author's contribution as presented on CD, section: Analysis methods for bridges subjected to seismic actions - ii (MS).
000013321 962__ $$r13074
000013321 980__ $$aPAPER