FORCE TRANSMISSION DUE TO COHESIVE SOIL-FOUNDATION INTERACTION UNDER VIBRATORY LOADING

The influence of footing size and mass on the dynamic forces or stress transmission due to cohesive soil-foundation interaction is presented for the particular situation of vibratory loading. The methods of dimensional analysis in conjunction with kinematic and force parameters in phase diagram form are shown to be useful in analyzing and formulating dynamic stress transmission-deflection response. The results of prototype tests were analyzed for reinforced concrete, circular footings with diameters ranging from 5 ft-2 in to 10 ft-4 in, total weights of the foundation system ranging from 6.41 tons to 25.64 tons, and applied dynamic force amplitudes varying from approximately 0.26 tons to 26 tons. The static stress level about which the dynamic stress perturbations were applied was maintained constant at 4.25 psi. Although the response is nonlinear, the dynamic stress amplitude transmitted to the supporting cohesive soil is related to the displacement, x, by a power relation. This is expressed in terms of a non-dimensional displacement amplitude parameter, x/d, which conveniently accounts for the effects of footing diameter, d, as well as the transmission factor, (T.F.), of the soil-foundation system. The dynamic stress transmission is given in both graphic and analytic form. The analysis and results contained herein may provide insight on the dynamic force or stress transmission to supporting cohesive soils as well as the associated displacement consequence of such transmission due to soil-structure interaction under dynamic loading.

Media Info

  • Features: Figures;
  • Pagination: p. 574-582

Subject/Index Terms

Filing Info

  • Accession Number: 00263713
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM