GROUND MOTION INDUCED INTERFACE PRESSURES

Interface pressures on the sides and bases of embedded cylindrical structures were measured during two experiments in which strong ground shaking was generated with high explosives. The dynamic lateral pressures were found to be related to the horizontal particle velocities while the vertical base pressures were related to the vertical accelerations. These results are explained qualitatively and, in part, quantitatively by a simple wave propagation model in which the structure is modeled as a rigid body and the incoming wave is compressive. This agreement between model and experiment is interesting since the horizontal motion component in the near-surface region contains a substantial contribution from a shear wave. It is hypothesized that the shear particle motion, upon interacting with the relatively rigid structure, translates into compression against the structure. As a result, the structure tends to behave in the same way as it would if the incident wave was compressive. If this hypothesis is correct then pressures induced on embedded structures during earthquakes, thought to contain a significant SH component, may be related to the motion environment in a way similar to that observed in the explosive experiments, i.e., lateral pressures will be a function of horizontal particle velocities while vertical pressures will be a function of vertical accelerations. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 492-511

Subject/Index Terms

Filing Info

  • Accession Number: 00179763
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM