Dynamic Characteristics of a 3-Pile Group under Vertical Vibration

In the present study, the dynamic behaviour of a hollow steel 3-pile group was investigated under vertical vibration by field vibration test and continuum approach analysis. The soil samples were collected from a borehole of 6.5-m depth. Both laboratory and field tests were performed to determine the soil properties. The forced vibration tests were conducted on a 3-pile group for different eccentric moments with static load of 10 kN. The time-acceleration response was measured for different frequencies using an accelerometer which was connected with a data accusation system. From the measured time-acceleration data, the frequency versus vertical displacement amplitudes were determined for different eccentric moments. The dynamic response of the pile group was analysed using the continuum approach of Novak, and the analytical results were compared with the dynamic test data. In the analysis, the interaction between two piles was used to formulate the group complex flexibility matrix from which the group stiffness and damping were deduced. It was found that the frequency-amplitude response obtained from the analysis was very close to the field response curve. The accuracy of the frequency response was found to be dependent on various nonlinear parameters like shear modulus ratio, thickness ratio and separation of soil-pile interface.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 363-372
  • Monograph Title: Advances in Soil Dynamics and Foundation Engineering

Subject/Index Terms

Filing Info

  • Accession Number: 01528595
  • Record Type: Publication
  • ISBN: 9780784413425
  • Files: TRIS, ASCE
  • Created Date: May 22 2014 3:03PM