Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3433
Título: Clear-water scour at pile groups
Autor: Lança, Rui
Fael, Cristina
Maia, Rodrigo
Pêgo, João
Cardoso, António
Palavras-chave: Scour
Bridges
Piers
Pile groups
Uncertainty
Sediments (Geology)
Data: Out-2013
Editora: American Society of Civil Engineering
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3433
DOI: http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000770
ISSN: 0733-9429
Versão do Editor: http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29HY.1943-7900.0000770
Aparece nas colecções:ISE2-Artigos (em revistas ou actas indexadas)

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
2013 Lança et al. - Clear-water scour at pile groups.pdf905,73 kBAdobe PDFVer/Abrir    Acesso Restrito. Solicitar cópia ao autor!


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.