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Micropiles are small-diameter drilled and grouted deep foundation elements used in various applications that often involve superstructure or ground conditions where construction of other foundation types is not practical.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 989: Reliability-Based Geotechnical Resistance Factors for Axially Loaded Micropiles details the development of reliability-based geotechnical resistance factors for axially loaded micropiles and related design specifications.

Supplemental to the report is an Appendix.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2022. Reliability-Based Geotechnical Resistance Factors for Axially Loaded Micropiles. Washington, DC: The National Academies Press. https://doi.org/10.17226/26615.

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Publication Info

120 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26615
Chapters skim
Front Matter i-viii
Summary 1-2
Chapter 1 - Background 3-18
Chapter 2 - Methods for Establishing Nominal Unit Bond Resistance 19-44
Chapter 3 - Probabilistic Calibration of Resistance Factors 45-68
Chapter 4 - Recommended Design Methods 69-75
Chapter 5 - Summary and Recommended Research 76-78
References 79-82
Appendix - Data Collection and Load Test Database (Web-Only) 83-84
Attachment - Proposed Changes to the AASHTO LRFD Bridge Design Specifications 85-112

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