Rocking response of SDOF systems on shallow improved sand: An experimental study

Anastasopoulos, I; Kourkoulis, R; Gelagoti, F; Papadopoulos, E

dc.contributor.author	Anastasopoulos, I	en
dc.contributor.author	Kourkoulis, R	en
dc.contributor.author	Gelagoti, F	en
dc.contributor.author	Papadopoulos, E	en
dc.date.accessioned	2014-03-01T02:12:08Z
dc.date.available	2014-03-01T02:12:08Z
dc.date.issued	2012	en
dc.identifier.issn	02677261	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30017
dc.subject.other	Alternative approach	en
dc.subject.other	Design philosophy	en
dc.subject.other	Design requirements	en
dc.subject.other	Engineering practices	en
dc.subject.other	Experimental studies	en
dc.subject.other	Inertia force	en
dc.subject.other	Rocking response	en
dc.subject.other	Rotation amplitudes	en
dc.subject.other	SDOF system	en
dc.subject.other	Seismic shaking	en
dc.subject.other	Shallow layers	en
dc.subject.other	Shallow soils	en
dc.subject.other	Soil failure	en
dc.subject.other	Soil improvement	en
dc.subject.other	Soil property	en
dc.subject.other	Static factor	en
dc.subject.other	Surface foundation	en
dc.subject.other	Foundations	en
dc.subject.other	Loading	en
dc.subject.other	Safety factor	en
dc.subject.other	Seismic design	en
dc.subject.other	Soils	en
dc.subject.other	cyclic loading	en
dc.subject.other	experimental study	en
dc.subject.other	footing	en
dc.subject.other	sand	en
dc.subject.other	seismic design	en
dc.subject.other	seismic response	en
dc.subject.other	shaking table test	en
dc.subject.other	shallow soil	en
dc.subject.other	soil improvement	en
dc.subject.other	soil property	en
dc.subject.other	soil-structure interaction	en
dc.subject.other	structural response	en
dc.subject.other	Feldmannia species virus	en
dc.title	Rocking response of SDOF systems on shallow improved sand: An experimental study	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.soildyn.2012.04.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.soildyn.2012.04.006	en
heal.publicationDate	2012	en
heal.abstract	Recent studies have highlighted the potential advantages of allowing inelastic foundation response during strong seismic shaking. Such an alternative seismic design philosophy, in which soil failure is used as a ""fuse"" for the superstructure has recently been proposed, in the form of ""rocking isolation"". Within this context, foundation rocking may be desirable as a means of bounding the inertia forces transmitted onto the superstructure, but incorporates the peril of unacceptable settlements in case of a low static factor of safety FSv. Hence, to ensure that rocking is materialized through uplifting rather than sinking, an adequately large FSv is required. Although this is feasible in theory, soil properties are not always well-known in engineering practice. However, since rocking-induced soil yielding is only mobilized within a shallow layer underneath the footing, ""shallow soil improvement"" is considered as an alternative approach to release the design from the jeopardy of unforeseen inadequate FSv. For this purpose, this paper studies the rocking response of relatively slender SDOF structures (h/B ratio equals 3 and rocking dominates over sliding), with emphasis on the effectiveness of shallow soil improvement stretching to various depths below the foundation. A series of reduced-scale monotonic and slow-cyclic pushover tests are conducted on SDOF systems lying on a square surface foundation. It is shown that shallow soil improvement may, indeed, be quite effective provided that its depth is equal to the width of the foundation. For lightly-loaded systems, an even shallower soil improvement may also be considered effective, depending on design requirements. The effectiveness of shallow soil improvement is ameliorated with the increase of cyclic rotation amplitude, and with repeating cycles of loading. © 2012 Elsevier Ltd.	en
heal.journalName	Soil Dynamics and Earthquake Engineering	en
dc.identifier.doi	10.1016/j.soildyn.2012.04.006	en
dc.identifier.volume	40	en
dc.identifier.spage	15	en
dc.identifier.epage	33	en