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RE: 1/3 Increase Allowed?

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As long as Section 1612.3.2 “Alternate basic load combinations” are used in the design of the members, the 1/3 increase in stress can be used.


For OSHPD jobs the 1/3 increased shall not be used when designing anchors such as expansion anchors.


Marlou Rodriguez, S.E.

MBRodriguez Engineering Inc.

2355 Oakland Road, Suite 14

San Jose, CA 95131

Tel: (408) 432-4866

From: Bill Allen [mailto:T.W.Allen(--nospam--at)]
Sent: Wednesday, December 27, 2006 2:56 PM
To: seaint(--nospam--at)
Subject: 1/3 Increase Allowed?


Code: 2001 CBC

Allowable Stress Design

California Zone 4


I’m hanging a fixture in a hospital using Unistrut members.

Can I take the 1/3 increase in allowable stresses?




T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509