Dynamic Characterization of Vertically Loaded Foundations on Granular Soils
Publication: Journal of Geotechnical Engineering
Volume 121, Issue 3
Abstract
By means of scaled modeling on a geotechnical centrifuge, a systematic experimental investigation was conducted to examine the vertical dynamic response of surface foundations on granular soils. From the results of more than 100 tests, it was found that the dynamic characteristics of such foundations can be well represented in the frequency domain by the homogeneous half-space analytical solution despite the gravity- and load-induced spatial variations of the soil's modulus. However, it was also revealed that the foundation response has a significant nonlinear dependence on the soil bearing pressure and footing dimension. To capture such aspects, a set of equivalent-homogeneous elastic parameters was determined from the physical measurements for a wide range of soil-foundation configurations. Through an analytical synthesis, it was found that the equivalent-homogeneous Poisson's ratio of the soil can be taken as 0.25 while the equivalent-homogeneous shear modulus of the soil can be related through a power law to the soil's void ratio, footing radius, and average foundation bearing pressure. The practical relevance and potential applications of the resulting semiempirical formula for the dynamic foundation compliance are discussed.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Burland, J. B., and Burbridge, M. C. (1985). “Settlement of foundations on sand and gravel.”Proc., Inst. Civ. Engrg., Vol. 78, 1325–1381.
2.
Campbell, D. J., Cheney, J. A., and Kutter, B. L. (1991). “Boundary effects in dynamic centrifuge model tests.”Centrifuge 91. A.A. Balkema, Rotterdam, The Netherlands, 441–448.
3.
Cheney, J. A., Brown, R. K., Dhat, N. R., and Hor, O. Y. Z.(1990). “Modeling free field conditions in centrifuge models.”J. Geotech. Engrg., ASCE, 116(9), 1346–1367.
4.
Coe, C. J., Prevost, J. H., and Scanlan, R. H. (1985). “Dynamic stress wave reflections/attenuation: earthquake simulation in centrifuge soil models.”Earthquake Engrg. Struct. Dyn., Vol. 13, 109–128.
5.
Dobry, R., and Gazetas, G.(1986). “Dynamic response of arbitrarily shaped foundations: experimental verification.”J. Geotech. Engrg., ASCE, 112(2), 136–154.
6.
Fry, Z. B. (1963). “Development and evaluation of soil bearing capacity foundations of structures: field vibratory tests data.”Tech. Rep. No. 3-632, Rep. 1, U.S. Army Waterways Experiment Station CE, Vicksburg, Miss.
7.
Guzina, B. B. (1992). “Dynamic response of surface foundations on heterogeneous soils,” MS thesis, Univ. of Colorado, Boulder, Colo.
8.
Hardin, B. O., and Black, W. L. (1968). “Vibration modulus of normally consolidated clay.”J. Soil Mech. Found. Engrg. Div., ASCE, Vol. 94, 353–369.
9.
Hardin, B. O., and Drnevich, V. P. (1972). “Shear modulus and damping in soils: design equations and curves.”J. Soil Mech. Found. Engrg. Div., ASCE, Vol. 98, 668–692.
10.
Ko, H. Y. (1988). “The Colorado centrifuge facility.”Centrifuge 88. A.A. Balkema, Rotterdam, The Netherlands, 73–76.
11.
Lenke, L. R., Pak, R. Y. S., and Ko, H. Y. (1991). “Boundary effects in modeling of foundations subjected to vertical excitation.”Centrifuge 91. A.A. Balkema, Rotterdam, The Netherlands, 473–480.
12.
Luco, J. E., and Westmann, R. A. (1971). “Dynamic response of circular footings.”J. Engrg. Mech. Div., ASCE, Vol. 97, 1381–1395.
13.
Pak, R. Y. S., and Gobert, A. T.(1991). “Forced vertical vibration of rigid discs with arbitrary embedment.”J. Engrg. Mech., ASCE, 117(11), 2527–2548.
14.
Richart, F. E., Hall, J. R., and Woods, R. D. (1970). Vibrations of soils and foundations . Prentice-Hall, Englewood Cliffs, N.J.
15.
Stokoe, K. H., and Richart, F. E.(1974). “Dynamic response of embedded machine foundations.”J. Geotech. Engrg. Div., ASCE, 100(4), 427–447.
16.
Stokoe, K. H., and Erden, S. M. (1985). “Influence of base shape on dynamic response of surface foundations.”Geotech. Engrg. Rep. GP 85-1, Civ. Engrg. Dept., Univ. of Texas, Austin, Austin, Tex.
17.
Terzaghi, K., and Peck, R. B. (1967). Soil mechanics in engineering practice . John Wiley, New York, N.Y.
18.
Wolf, J. P. (1985). Dynamic soil-structure interaction . Prentice-Hall, Englewood Cliffs, N.J.
Information & Authors
Information
Published In
Journal of Geotechnical Engineering
Volume 121 • Issue 3 • March 1995
Pages: 274 - 286
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Mar 1, 1995
Published in print: Mar 1995
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.