Modal analysis of block type foundations, including damping, and test data from vibration tests on surface and embedded footings have been presented. It was found that unique values of damping ratio and spring constants could not be used to predict the complete response of the foundations, although the resonant frequencies and resonant amplitudes could be reasonably estimated. Under the coupled horizontal and rocking mode, it was established that the minimum value of the damping constant occurs at resonance. An empirical relationship for predicting the damping at any particular frequency level was derived. Effect of surface roughness, embedment, backfill, etc., have been briefly discussed. A simple mathematical model has been presented to predict completely the response of coupled oscillations in block foundations. /Author/

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 890-906

Subject/Index Terms

Filing Info

  • Accession Number: 00179787
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM