Kinematic pile bending during earthquakes: Analysis and field measurements

Nikolaou, S; Mylonakis, G; Gazetas, G; Tazoh, T

dc.contributor.author	Nikolaou, S	en
dc.contributor.author	Mylonakis, G	en
dc.contributor.author	Gazetas, G	en
dc.contributor.author	Tazoh, T	en
dc.date.accessioned	2014-03-01T01:16:40Z
dc.date.available	2014-03-01T01:16:40Z
dc.date.issued	2001	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14155
dc.subject	Case history	en
dc.subject	Dynamics	en
dc.subject	Earthquakes	en
dc.subject	Numerical modelling and analysis	en
dc.subject	Piles	en
dc.subject	Soil structure interaction	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Boundary conditions	en
dc.subject.other	Loading	en
dc.subject.other	Piles	en
dc.subject.other	Seismology	en
dc.subject.other	Soils	en
dc.subject.other	Field measurements	en
dc.subject.other	Earthquakes	en
dc.subject.other	bending	en
dc.subject.other	loading	en
dc.subject.other	pile response	en
dc.subject.other	seismic response	en
dc.subject.other	soil-structure interaction	en
dc.subject.other	Winkler foundation	en
dc.title	Kinematic pile bending during earthquakes: Analysis and field measurements	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.51.5.425.39973	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.51.5.425.39973	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The passage of seismic waves through the soil surrounding a pile imposes lateral displacements and curvatures on the pile, thereby generating 'kinematic' bending moments even in the absence of a superstructure. These moments are concentrated in the vicinity of interfaces of alternating soft and stiff soil layers and, in the case of restrained-head piles, at the pile head. The scope of this paper is threefold: (a) to critically review some existing design methods for kinematic pile loading; (b) to develop new analytical results for piles in homogeneous and layered soils; (c) to present a case study in which theoretical predictions are tested against field measurements. To this end, an approximate beam-on-dynamic-Winkler-foundation (BDWF) model is implemented, specifically developed for the seismic response of piles in layered soil. Both fixed- and free-head piles, and different boundary conditions at the pile toe, are considered. It is shown that the magnitude of kinematic moments depends mainly on the stiffness contrast between the soil layers, the pile-soil stiffness contrast, the excitation frequency, and the number of excitation cycles. A unique case history involving the instrumented pile foundation of a multistorey building in Japan is presented. Time histories of bending and axial strains recorded at six locations along two piles are successfully compared with results computed from simple formulae and methods presented in the paper.	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.51.5.425.39973	en
dc.identifier.isi	ISI:000169494000004	en
dc.identifier.volume	51	en
dc.identifier.issue	5	en
dc.identifier.spage	425	en
dc.identifier.epage	440	en