ON VORTEX EXCITATION OF MODEL PILES IN WATER

An investigation has been made to determine the nature of flow-induced oscillations in water of circular cylindrical model piles typical of full-scale marine structures. Wind indused oscillations of cylinders usually result in motion normal to the direction of approach flow; in water, oscillations can be excited in the cross-flow and in-line directions. In this paper, a brief review of some of the relevant published literature is followed by a presentation and discussion of the experimental results obtained from the tests at BHRA. Reference is made to full-scale data where appropriate. Fundamental oscillations of free-ended Cantilevers were studied in the in-line and cross-flow directions; second normal mode oscillations were also observied in the in-line direction. The second normal mode was of particular practical interest because it approximated the clamped-pinned condition more frequently encountered in full-scale applications. The results showed that two distinct types of instability occurred. These are discussed in some detail and, based on measurements of wake frequencies and pile responses, possible machanisms of excitation and stability criteria are proposed. /AUTHOR/

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  • Corporate Authors:

    Academic Press Incorporated

    Berkeley Square House, Berkeley Square
    London W1,   England 
  • Authors:
    • KING, R
    • PROSSER, M J
    • Johns, D J
  • Publication Date: 1972

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Filing Info

  • Accession Number: 00291130
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 19 1974 12:00AM