Clear-water scour at pile groups

Lança, Rui; Fael, Cristina; Maia, Rodrigo; Pêgo, João; Cardoso, António

Publication

Clear-water scour at pile groups

2013-10Journal article

dc.contributor.author	Lança, Rui
dc.contributor.author	Fael, Cristina
dc.contributor.author	Maia, Rodrigo
dc.contributor.author	Pêgo, João
dc.contributor.author	Cardoso, António
dc.date.accessioned	2014-02-06T12:48:16Z
dc.date.available	2014-02-06T12:48:16Z
dc.date.issued	2013-10
dc.description.abstract	Groups of piles are frequently used as bridge foundations. Different group configurations, characterized by different pile spacing, skew-angle, number, and arrangement of pile group columns interact differently with the flow field and lead to different scour patterns and equilibrium scour depth. There have been a number of past studies on the characterization of scouring at pile groups, but most of them report short duration scour experiments. A priori, such short durations may be postulated to inherently carry important uncertainties into existing scour predictors. In this study, 75 long-duration laboratory tests were run under steady, clear-water flow close to the threshold for initiation of sediment motion, to address the effect of time, pile spacing, skew-angle and number of pile group columns on the equilibrium scour depth. Pile groups consisted of matrical arrangements of one, two, or three columns of four rows, with spacings of 1, 2, 3, 4.5, and 6 pile diameters; the tested skew-angles were 0, 15, 30, 45, and 90°. Important contributions were achieved on (1) the impact of the duration of tests on the shape of the scour hole as well as on the precision of coefficients involved in current predictors, (2) the most unfavorable skew angle, (3) the behavior of collapsed pile groups, (4) the maximum scour depth at pile groups composed of a single alignment, and (5) the performance of two current predictors of scour depth at pile groups. Two formulations of a predictor for the calculation of an aggregated pile group factor are suggested.	por
dc.identifier.doi	http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000770
dc.identifier.issn	0733-9429
dc.identifier.other	AUT: RLA01366
dc.identifier.uri	http://hdl.handle.net/10400.1/3433
dc.language.iso	eng	por
dc.peerreviewed	yes	por
dc.publisher	American Society of Civil Engineering	por
dc.relation.publisherversion	http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29HY.1943-7900.0000770	por
dc.subject	Scour	por
dc.subject	Bridges	por
dc.subject	Piers	por
dc.subject	Pile groups	por
dc.subject	Uncertainty	por
dc.subject	Sediments (Geology)	por
dc.title	Clear-water scour at pile groups	por
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.conferencePlace	Estados Unidos	por
oaire.citation.endPage	1098	por
oaire.citation.issue	10	por
oaire.citation.startPage	1089	por
oaire.citation.title	Journal of Hydraulic Engineering	por
oaire.citation.volume	139	por
person.familyName	Lança
person.givenName	Rui
person.identifier	R-001-Y2N
person.identifier.ciencia-id	CD11-F4F2-95A3
person.identifier.orcid	0000-0002-7753-3767
person.identifier.rid	E-5613-2017
person.identifier.scopus-author-id	55436772300
rcaap.rights	openAccess	por
rcaap.type	article	por
relation.isAuthorOfPublication	48b48fbe-d952-4eea-8ec5-b989420561d9
relation.isAuthorOfPublication.latestForDiscovery	48b48fbe-d952-4eea-8ec5-b989420561d9