January/February 2021 - 95

Load test demo at DFI-HPW helical piles and tiebacks seminar

FEATURE

ARTICLE

DFI Committee Helps Revise ASTM Standard
Almost everyone involved in deep
foundations has either witnessed,
designed or utilized the data from a
static compressive load test. Invariably,
the test is run in accordance with one
version or another of the ASTM
Standard D1143 of ASTM International
(formerly known as American Society
for Testing and Materials). During the
past 2 years, the DFI Codes and
Standards Committee reviewed this
standard and advocated a series of
useful changes that have been
incorporated. The standard's new
designation is " ASTM D1143/D1143M -
20, Standard Test Methods for Deep
Foundation Elements Under Static
Axial Compressive Load, " and the
updated version is currently available
from ASTM.
The DFI committee's vice chair,
Robert Simpson, played a key role in the
changes in that he is also the chair of
ASTM subcommittee D18.11 (Soil and

AUTHORS

Rock, Deep Foundations); that ASTM
subcommittee has jurisdiction over
ASTM D1143 and related deep
foundation testing standards. The
revised standard that became effective
in October 2020 has many updates that
will likely be viewed as minor changes
in terminology. Some of the more
important changes will be discussed in
this article by the committee members
most involved in this project.

Revision History
Imagine a scenario in which you have
been told that your load frame design
was inadequate because it was not
designed to meet the requirement that
the load frame " be capable of safely
applying at least 120% of the
anticipated maximum test load. " You
may have argued that your load and
resistance factor design (LRFD) includes
an appropriate load factor that ensures
a factor of safety of at least 1.2, but you

lost the argument because the language
in the standard was ambiguous and
could be interpreted in different ways.
The revised standard simply states that
the load frame " ... shall be designed in
accordance with recognized standards
by a qualified engineer who shall
clearly define the maximum allowable
load that can be safely applied. "
In the revised standard, the word
Engineer is changed to lower case
engineer. The reason for this change is to
take into consideration the fact that
most foundation projects have multiple
licensed engineers with differing roles.
The engineers involved in the test can
include the owner's geotechnical and
structural engineers, the load frame
design engineer and the engineer who
is monitoring the test. Each engineer
has a specific responsibility. Successful
projects generally require that all
engineers understand and respect each
other's role.

Daniel Stevenson, P.E., Berkel and Company Contractors; Robert Simpson, Load Test Consulting; and Lawrence Johnsen, GZA GeoEnvironmental
DEEP FOUNDATIONS * JAN/FEB 2021 * 95



January/February 2021

Table of Contents for the Digital Edition of January/February 2021

Contents
January/February 2021 - Intro
January/February 2021 - 1
January/February 2021 - 2
January/February 2021 - Contents
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