Statnamic Damping Coefficient: Numerical Modeling Approach
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 9
Abstract
The damping associated with dynamic or statnamic tests has typically been over simplified to provide a “catch-all” factor for those responses that could not be fully accounted for using present analyses. This factor has historically been considered constant for a given pile–soil system, but recent investigations as well as previous case studies show the plausibility of another explanation. This study hypothesizes that damping is more closely associated with the increase in strain and not the total strain. Therein, the change in the volumetric strain is being scrutinized to investigate its relationship to damping. To validate this assumption, a numerical model is created which simulates the testing of a full-scale drilled shaft and results analyzed to determine the extent of the zone of influence and volumetric contribution to damping.
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Acknowledgments
The writers would like to acknowledge and thank the Federal Highway Administration for funding this study; Dr. Alaa Ashmawy, M.ASCE for his technical assistance; Bermingham Foundation Solutions, Ontario; and Foundations and Geotechnical Engineering (FGE) for their continual support.
References
ASTM. (1981). “Standard test method for piles under static axial compressive load (Withdrawn 2006).” ASTM D 1143, Philadelphia.
ASTM. (2000). “Standard test method for high-strain dynamic testing of piles.” ASTM D 4945, Philadelphia.
ASTM. (2006). “Standard test method for a pile under an axial compressive force pulse.” ASTM WK 7120, Philadelphia (under development).
Ealy, C. D., and Justason, M. D. (2000). “STATNAMIC and static load testing of a model pile group in sand.” Proc., 2nd Int. Statnamic Seminar, Tokyo, Balkema, Rotterdam, The Netherlands, 169–177.
Gunaratne, M. (2006). The foundation engineering handbook, CRC Press, Boca Raton, Fla., 306–307.
Itasca Consulting Group, Inc. (2002). FLAC user’s guide, Mill Place, Minneapolis.
Middendorp, P., Bermingham, P., and Kuiper, B. (1992). “Statnamic load testing of foundation piles.” Proc., 4th Int. Conf. on Application of Stress-Wave Theory of Piles, The Hague, Balkema, Rotterdam, The Netherlands, 581–588.
Mullins, G., Garbin, E. J., and Lewis, C. (2000). “STATNAMIC testing: University of South Florida research.” Proc., 2nd Int. Statnamic Seminar, Tokyo, Balkema, Rotterdam, The Netherlands, 117–132.
Mullins, G., Lewis, C., and Justason, M. (2002). “Advancements in statnamic data regression techniques.” Deep foundations 2002: An international perspective on theory, design, construction, and performance, Vol. II, GSP No. 116, ASCE Geo Institute, Orlando, Fla., 915–930.
Mullins, G., and Stokes, M. (2007). “Statnamic damping.” Proc., Rapid Load Test Seminar, GeoDelft, Delft, The Netherlands.
Mullins, G., and Winters, D. (2004). “Post grouting drilled shaft tips—Phase II final report.” Final Rep., Submitted to Florida Dept. of Transportation, Tallahassee, Fla.
Transportation Research Board of the National Academies. (2003). “Prefabricated bridge elements and systems to limit traffic disruption during construction: A synthesis of highway practice.” National Cooperative Highway Research Program Synthesis No. 324, Washington, D.C.
Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 9 • September 2008
Pages: 1290 - 1298
Copyright
© 2008 ASCE.
History
Received: Apr 3, 2006
Accepted: Jan 18, 2008
Published online: Sep 1, 2008
Published in print: Sep 2008
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