NEHRP Clearinghouse
- Title
- Vertical and Torsional Vibration of Foundations in Inhomogeneous Media.
- File
- PB88134291.pdf
- Author(s)
- Veletsos, A. S.; Dotson, K. W.
- Source
- National Science Foundation, Washington, DC., June 1, 1987, 43 p.
- Identifying Number(s)
- NCEER-87-0010
- Abstract
- A study of the dynamic impedances for a radially inhomogeneous infinite viscoelastic layer with a circular hole, and for piles embedded in a medium represented by such layers is made. Systems in vertical and torsional modes of vibration are examined considering both a discontinuous variation in shear modulus and an exponentially increasing, continuous variation. The results are evaluated over wide ranges of the parameters involved and compared with those obtained for a homogeneous layer. In addition, the harmonic response of strip foundations supported at the surface of a vertically inhomogeneous viscoelastic halfspace is examined, and it is shown that within the framework of a previously proposed approximation, the impedances of such foundations for both horizontal and vertical modes of vibration may be deduced from those obtained for the vertically excited, radially inhomogeneous layer.
- Keywords
- ; Harmonic functions; Vibration; Earthquake engineering; Pile foundations; Layers; Soil horizons; Soil mechanics