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New AC358 Revisions Submitted to ICC-ES

by Bill Bonekemper & Moncef Souissi

March 7, 2012

Last November the Ad Hoc Committee of Helical Pile Manufacturers met with engineers from ICC-ES in their Los Angeles offices in an attempt to resolve open items for the revisions of AC358 - the acceptance criteria for helical piles, anchors and brackets.  Over the past two months, the committee and it’s consulting engineer, Mr. Moncef Souissi of CTL/Thompson, completed the work on the revised draft that was submitted to ICC-ES on February 22.

There are still some unresolved items that need to be addressed.  One significant such item is specific to the IBC code pertaining to shaft eccentricity.  The IBC code for deep foundation pilings specifies an eccentricity of 3 inches.  This specification has been in place for some time for larger diameter pilings and/or driven piles.  Since helical piles covered in AC358 are very slender piles by comparison, the 3 inch eccentricity requirement would reduce allowable capacities significantly.

ICC-ES will now review the submission and submit requested changes, if any, to the Ad Hoc Committee in early Spring.  The objective is to reach consensus and adopt a final draft in time for the June 5-7 public meeting of the International Code Council in Los Angeles.