March/April 2021 - 71

FEATURE

ARTICLE

Installation of CIP element at Georgia nuclear facility

In the design of deep
foundations for a structure,
a single deep foundation
element (structural pile)
may be used to support a
building column. The most
common element used in
such cases is a drilled shaft (also called
a drilled pier, caisson or bored pile).
However, as installation capabilities
have improved, large diameter augered
cast-in-place (ACIP or augercast) piles
are increasingly popular. While drilled
shafts and ACIPs differ significantly in
construction methods, in the eyes of
the International Building Code (IBC),
both are considered as cast-in-place
deep foundations governed by the
same code provisions. This article,

In IBC 2018 1810.2.2,
d e e p fo u n d a t i o n s a r e
required to be braced such
that lateral stability is
provided in all directions.
An exception is provided
for isolated, cast-in-place
elements that have a diameter (D) of at
least 2 ft (610 mm) and a length (L) not
more than 12 times the diameter. Large
diameter drilled shafts, anecdotally, are
sometimes not held to this length
limitation. As a geotechnical community, we intuitively understand that
a 3 ft (900 mm) diameter shaft is no less
stable at lengths of 35 ft than 37 ft
(10 m or 12 m), or just above and below
the limiting ratio presented in the code.
However, larger diameter augercast

Evaluating Lateral Bracing
Code Requirements for
Large Diameter Foundations

AUTHORS

which includes data from an upcoming
white paper from DFI's Augered Castin-Place and Drilled Displacement Pile
Committee, discusses the need to
reconsider provisions contained in the
2018 International Building Code section
that govern the lateral stability of CIP
d e e p fo u n d a t i o n e l e m e n t s . T h e
authors' goal is to better inform code
revision decisions that will permit
innovation in the deep foundations
industry.

Jeffrey Donville, P.E., Beaty Construction, Jon Huff, P.E., Goettle, Hannah Iezzoni, P.E., Keller North America, and
Dan Stevenson, P.E., Berkel and Company
DEEP FOUNDATIONS * MAR/APR 2021 * 71



March/April 2021

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

TOC
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