EMBEDDED FOUNDATIONS UNDER VERTICAL VIBRATION

Foundations, especially those for machines, are usually embedded. For embedded footings, damping exists from the friction and adhesion at the side interface of the footing and the soil, in addition to that due to radiation. During translational movements, radiation damping is very large when compared with internal damping and hence it can be neglected. Exact solution for steady-state vibration of a system damped by a combination of dry and viscous friction has been given by Dem Hartog for frequency independent excitation. Anandakrishnan and Krishnaswamy, following the same procedure, gave a solution for the case of frequency dependent excitation. The exact solution given in the previously cited sources is very complicated and lengthy. In this note, a simplified procedure based on energy consideration, has been developed, for the solution of steady-state vibration of a system with combined viscous and Coulomb friction damping, subjected to frequency in dependent and frequency dependent excitation, which yields results essentially same as the exact solution. The proposed method uses equivalent damping (3) which assumes that if the damping in a system is small, the total damping effect can be represented by that of an equivalent damper. (Author)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Sridharan, A
  • Nagendra, M V
  • Chinnaswamy, C
• Publication Date: 1981-10

Media Info

• Features: Figures; References;
• Pagination: p. 1429-34
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 107
  • Issue Number: GT10
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Adhesion; Alignment; Anchoring; Damping (Physics); Footings; Foundations; Friction; Steady state; Vibration
• Uncontrolled Terms: Embedment; Vertical alignment
• Old TRIS Terms: Coulomb equation; Foundations (Structures)
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00345141
• Record Type: Publication
• Report/Paper Numbers: ASCE 16585 Proceeding
• Files: TRIS
• Created Date: Jan 29 1982 12:00AM