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Shallow Post and Pier Foundation Design

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

ASAE  ANSI/ASAE EP486.3   September  2017

Keywords: Foundation, Post, Shallow, Structures

1 Purpose and scope

1.1 Purpose. The purpose of this Engineering Practice is to present a procedure for determining the adequacy of shallow, isolated post and pier foundations in resisting applied structural loads. This Engineering Practice will help ensure that soil and backfill are not overloaded, foundation elements have adequate strength, frost heave is minimized, and lateral movements are not excessive.

1.2 Scope. This engineering practice contains safety factors and other provisions for allowable stress design (ASD) which is also known as working stress design, and for load and resistance factor design (LRFD) which is also known as strength design. It also contains properties and procedures for modeling soil deformation for use in structural building frame analyses.

1.2.1 Limitations. Application of this Engineering Practice is limited to post and pier foundations with the following characteristics:

-vertically installed in relatively level terrain;

-concentrically-loaded footings;

-minimum post or pier foundation spacing equal to the greater of 4.5 times the maximum dimension of the post/pier cross-section, or three times the maximum dimension of a footing or attached collar.

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