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RE: ACI 318-08 Section 14.8 Alternate Design of Slender Walls

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I don’t have a copy of the ACI 318-08. But many cities in southern and northern California adopted an amendment regarding this issue in their muni codes, which I believe is what got incorporated to the ACI code. The proposed change is amendment #4 starting at the top of page 3:




Ben Yousefi, SE, CBO

Chief Building Official

City of Mountain View, CA

(650) 526-7007



From: Andre Sidler [mailto:asidler(--nospam--at)]

Sent: Tuesday, October 28, 2008 3:54 PM

To: seaint(--nospam--at)

Subject: ACI 318-08 Section 14.8 Alternate Design of Slender Walls


SEA Listers -


I sat in on a webinar on Tuesday morning and I was informed that the calculation of the P-delta and secondary moment in Section 14.8.4 of ACI 318-05 is unconcervative and that the brand-spankin' new ACI 318-08 has corrected this.  Is there anyone out in the SEA Listserve universe that would be kind enough to send me a PDF file of section 14.8 of the ACI 318-08?  I can't bring myself to purchase this edition just yet; I'd rather wait until IBC 2010 becomes the law of the land.


Second, why doesn't ACI issue a supplement to ACI 318-05 to correct this?  ASCE issued a supplement for ASCE 7-05 that made some modifications.  It seems that if this method is as unconservative as we were led to believe in the webinar then this should be taken care of immediately.




Andre J. Sidler, S.E., P.E.

Quantum Consulting Engineers

Seattle, WA