Evaluating Lateral Bracing Code Requirements for Large Diameter Foundations

Jeffrey Donville, Beaty Construction, Jon Huff, Goettle, Hannah Iezzoni, Keller North America, and Dan Stevenson, Berkel and Company

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, which includes data from an upcoming white paper from DFI’s Augered Cast-in-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 deep foundation elements. The authors’ goal is to better inform code revision decisions that will permit innovation in the deep foundations industry.

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