March/April 2021 - 75

Conclusion
The current language in IBC 2018
1810.2.2 is applied to isolated CIP deep
foundation elements in ways that
prohibit innovation in the deep foundation industry. After reviewing the
current language and prior codes, it
appears that the lateral bracing requirement is a holdover from previous
iterations of code changes and no longer
applies as it was originally intended.
Engineers intuitively understand that
longer elements are not automatically

less stable than similar sized, yet shorter,
elements. From the history discussion
and the structural modeling described
in this article, it is apparent that the
length limitations imposed by IBC 2018
lack a rational basis. This suggests that
current IBC code provisions should be
revised to eliminate the requirement
that isolated deep foundation members
have a length-to-diameter ratio of not
more than 12.

Acknowledgements
Morgan NeSmith, P.E. (Berkel and
Company), Noah Miner, P.E. (Malcom
Drilling Company) and Christophe
Locussol, P.E. (GEI Consultants),
assisted the authors with research,
review and FE modeling.
NOTE: DFI's Augered Cast-in-Place
and Drilled Displacement Pile
Committee white paper on the subject
of International Building Code (IBC)
Section 1810.2.2 is still under technical
and editorial review. This article
regarding that IBC section's focus on
the lateral stability of cast-in-place
deep foundation elements includes
some of the data to be presented in the
white paper, and is meant to inform the

magazine readership. However, the
more rigorously reviewed white paper,
to be published by DFI, will be the longterm reference document.
Jeffrey Donville, P.E., has over 20 years of
geotechnical engineering experience. For the
past 13 years, he has led the design of deep
foundations and earth retention systems at
Beaty Construction.
Jon Huff, P.E., is a vice president at Goettle,
with over 10 years of experience in the
estimating, design and construction of deep
foundations and earth retention systems. He is
the chair of DFI's Augered Cast-In-Place and
Drilled Displacement Pile Committee.
Hannah Iezzoni, P.E., is a design engineer for
Keller North America with 8 years of experience
in contractor support design and geostructural
construction. She is the secretary of the Augered
Cast-In-Place and Drilled Displacement Pile
Committee and an active member of DFI's
Women in Deep Foundations Committee.
Dan Stevenson, P.E., is the chief structural
engineer for Berkel and Company Contractors.
He has over 30 years of experience in the design,
execution and monitoring of geostructural
solutions and has published technical papers for
geotechnical conferences and periodicals.
Stevenson is chair of the DFI Codes and
Standards Committee.

Crane-supported large diameter ACIP in Miami
Fixed mast drilling rig with drilled shaft tool

DEEP FOUNDATIONS * MAR/APR 2021 * 75



March/April 2021

Table of Contents for the Digital Edition of March/April 2021

TOC
March/April 2021 - Intro
March/April 2021 - 1
March/April 2021 - 2
March/April 2021 - TOC
March/April 2021 - 4
March/April 2021 - 5
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