LABORATORY STUDY OF LIFT FORCES ON CIRCULAR PILES

UNDER SOME CIRCUMSTANCES, OCEAN WAVES EXERT LIFT (I. E., TRANSVERSE) FORCES ON PILES IN ADDITION TO THE LONGITUDINAL FORCES. THE LIFT FORCES ARE RELATED TO THE FORMATION AND SHEDDING OF EDDIES. THE LIFT FORCES WERE FOUND TO BE AS GREAT AS 60% OF THE LONGITUDINAL FORCES. THE KEULEGAN-CARPENTER NUMBER IS FOUND TO BE A REASONABLE PARAMETER TO DETERMINE THE REGIME IN WHICH EDDIES FORM, AND TO BE RELATED TO THE RATIO OF THE LIFT TO LONGITUDINAL FORCES. EDDIES FORM IN THE LEE OF A VERTICAL CYLINDRICAL PILE SUBJECT TO WATER WAVES WHEN THE KEULEGAN-CARPENTER NUMBER HAS A VALUE OF ABOUT 3. FOR HIGHER KEULEGAN-CARPENTER NUMBERS TWO EDDIES ARE DEVELOPED AND SHED AND THE LIFT FORCE IS MORE OR LESS REGULAR WITH A FREQUENCY TWICE THE FREQUENCY OF THE W WAVES. FOR FURTHER INCREASE IN THE KEULEGAN-CARPENTER NUMBER TURBULENCE DEVELOPS AND THE LIFT FORCES SHOW A RANDOM PATTERN. THE RATIO OF THE LIFT TO THE LONGITUDINAL FORCES APPEARS TO BE AT A MAXIMUM FOR A KEULEGAN-CARPENTER NUMBER OF ABOUT 15. /ASCE/

• Supplemental Notes:
  • Vol 97, No WW 4, PROC PAPER 8495, PP 595-614, 19 FIG, 1 TAB,
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Bidde, D D
• Publication Date: 1971-11

Media Info

• Serial:
  • Journal of Waterways and Harbors Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Coasts; Eddies; Engineering; Frequency (Electromagnetism); Loads; Offshore structures; Resonance; Support piles; Water; Water waves; Waves
• Uncontrolled Terms: Lateral loads; Vertical loads
• Old TRIS Terms: Coastal
• Subject Areas: Bridges and other structures; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00209572
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 20 1971 12:00AM