TECHNICAL PAPERS
Nov 15, 2011

Performance of Helical Disk Ground Anchors for Anchorage of Manufactured Housing

Publication: Journal of Architectural Engineering
Volume 17, Issue 4

Abstract

The performance of conventional (helical disk) ground anchors is important to the overall quality and safety of manufactured home installations and other applications requiring anchorage to ground. This paper presents findings from an investigation of the performance of conventional ground anchors and soil index test methods in a variety of soil conditions by using a range of ground anchor types, sizes, and assemblies. The results and conclusions address variation in soil classification methods, correlation of soil index test methods to anchor performance, predictability of conventional ground anchor assembly performance, and factors affecting reliability or repeatability of test methodology. Recommendations are given to improve a proposed ground anchor test protocol and to further address significant research needs, such as the effect of seasonal variation in ground moisture on soil index tests and ground anchor performance.

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Acknowledgments

The team that worked on this research includes William Zoeller, Ric Guilbert, Miguel Bencosme, and Steven Winter of Steven Winter Associates; Jay Crandell of ARES Consulting; and Mark Nowak of Newport Partners, LLC. Significant contributions were also provided by staff at the U.S. Department of Housing and Urban Development, particularly Mike Blanford, Rick Mendlen, and William Matchneer. The writers are especially indebted to the anchor manufacturers and others who assisted with this project, including the participants at the Georgia test site: Bob Prophet, David Low, James Zuehlke, Andy Oliphant, Scott Moreno, Jon Lower, Knute Chauncey, and John Overmier.

References

FEMA. (2005). Manufactured homes in flood areas (FEMA 85), 2nd Ed.
Ground Anchor Assembly Test Protocol (GAATP). (2005). “Ground Anchor Assembly Test Protocol (Draft).” Manufactured Housing Consensus Committee Installation Subcommittee.
Housing and Urban Development (HUD). (2006). “Task 2c—Verification of applied engineering principles and sound engineering judgment.” Interim Report, prepared by Steven Winter Associates for (HUD Contract No. C-CHI-00830), U. S. Department of Housing and Urban Development, Washington, DC.
HUD. (2008). “Task 2d—Ground anchor verification testing.” Office of PD&R, U. S. Department of Housing and Urban Development, Washington, DC.
Kovacs, W. D., and Yokel, F. Y. (1979). “Soil and rock anchors for mobile homes—A state of the art report.” NBS Building Science Series 107, National Bureau of Standards, Washington, DC, 147.
Marshall, R. D. (1994). “Manufactured homes—Probability of failure and the need for better windstorm protection through improved anchoring systems.” NISTIR 5370, National Institute of Standards and Technology, Gaithersburg, MD.
Mays, T. W. (2005). “Permanent foundations vs. traditional soil anchors: Using example calculations to illustrate relative performance of manufactured housing foundations in hurricane zones.” Coastal Disasters 2005, American Society of Civil Engineers, Reston, VA.
Manufactured Home Construction and Safety Standards (MHCSS). (1994). “Manufactured home construction and safety standards” (24 CFR Part 3280), April 1, 2004, Ed.
Manufactured Housing Research Alliance (MHRA). (2000). “Guidelines for anchor system design: Technical support document.” Manufactured Housing Research Alliance, NY.
Model Manufactured Home Installation Standards (MMHIS). (2007). “Model Manufactured Home Installation Standards: Final Rule (24 CFR Part 3285).” Federal Register, 72(202).
Pearson, J. E., Longinow, A., and Meinheit, D. F. (1996). “Wind protection tie-downs for manufactured homes.” Practice Periodical on Structural Design and Construction, ASCE, Reston, VA, 126–140.
Pearson, J. E., Meinheit, D. F., and Longinow, A. (1991). “Testing of soil anchors and strapping.” Report No. WJE 901798, prepared for U.S. Dept. of Housing and Urban Development, WJE Associates, Inc., Northbrook, IL, 67.
Pearson, J. E., Meinheit, D. F., and Longinow, A. (1993). “Full-scale laboratory testing of manufactured housing lateral load restraint devices.” HUD006360, U.S. Department of Housing and Urban Development, Wiss Janney Elstner Assoc. Inc.
Yokel, F. Y., Chung, R. M., Rankin, F. A., and Yancey, C. W. C. (1982). “Load-displacement characteristics of shallow soil anchors.” NBS Building Science Series 142, National Bureau of Standards, Washington, DC, 147.
Yokel, F. Y., Chung, R. M., and Yancey, C. W. (1981). “National Bureau of Standards (NBS) studies of mobile home foundations.” NBSIR 81-2238, NBS, US DOC, Washington, DC.

Information & Authors

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Published In

Go to Journal of Architectural Engineering
Journal of Architectural Engineering
Volume 17Issue 4December 2011
Pages: 125 - 133

History

Received: Nov 3, 2009
Accepted: Jun 8, 2011
Published online: Nov 15, 2011
Published in print: Dec 1, 2011

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Authors

Affiliations

Jay H. Crandell, M.ASCE [email protected]
P.E.
Consultant, d/b/a ARES Consulting, 615 Armel Rd., White Post, VA 22663 (corresponding author). E-mail: [email protected]
R. A. William Zoeller [email protected]
Consultant, Steven Winter Associates, 50 Washington Street, Norwalk, CT 06854. E-mail: [email protected]
Principal, Newport Partners LLC, 3760 Tanglewood Ln., Davidsonville, MD 21035. E-mail: [email protected]
Mike Blanford
Research Engineer, U.S. Dept. of Housing and Urban Development, 451 7th St. SW, Rm 8132, Washington, DC 20410.

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