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Re: CBC 2007 Revisions to Appendix D

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I believe that you do have to use the 0.75 redcution factor as well.  Can you use a smaller diameter anchor, deeper embedment, or a lower grade steel to ensure ductility?
Howard Silverman, PE
Anchoring Systems & Field Engineer Manager
USP Structural Connectors/Covert Operations

-----Original Message-----
From: FSRahbar(--nospam--at)
To: seaint(--nospam--at)
Sent: Fri, Oct 2, 2009 10:14 am
Subject: CBC 2007 Revisions to Appendix D

CBC 2007, Section 1908.1.16, Modification to D.3.3.3, requires use of a reduction factor of 0.75 factor in calculating the Design Strength of Anchors. Modification to Section D.3.3.5, requires a ductile connection or" the minimum design strength of the anchors shall be at least 2.5 times the factored forces transmitted by the attachment".
Question: When we multiply the factored forces by 2.5, do we still have to use the 0.75 reduction factor in calculating the design strength?
Thank you,

Farzin S. Rahbar, SE
David C. Weiss Structural Engineer & Associates, Inc.
(818) 227-8040 Ex. 13 Fax: (818) 227-8041