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Re: SEAOC Design Manual Vol 3 Example 4 design question:

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The code check is written for comparison with the "nominal shear strength", which is the definition of "Vn" as defined in the UBC. I think the point of the provision is to prevent brittle failure caused by failure of the concrete in compression (the compression "strut"); it's a yield mode issue, so the phi factor isn't considered. It's limiting the amount of shear strength that can be added due to shear steel, not the allowable overall shear stress value.

Jon Brody, C.E.
Jon Brody Consulting Engineers
1045 Sansome Street, Suite 200
San Francisco, CA  94111
(415) 296-9494
(415) 296-9499 fax

From: "Rodriguez, Marlou" <mrodriguez(--nospam--at)>
Reply-To: seaint(--nospam--at)
To: 'SEAINT Newslist' <seaint(--nospam--at)>
Subject: SEAOC Design Manual Vol 3 Example 4 design question:
Date: Thu, 16 Nov 2000 08:50:16 -0800

Turning to Page 229 of the Seaoc Design Manual Vol 3, Example 4 "Reinforced
Concrete Wall".

When comparing phi*Vn with the max per UBC 1921.6.5.6  8*Acv*sqrt(f`c), Phi
was not applied to the Max allowed.

Can someone explain why phi was not applied,


Marlou B. Rodriguez
Biggs Cardossa Associates Inc.
Structural Engineers
1871 The Alameda, Suite 200
San Jose, California 95126
408-296-5515 Fax 408-296-8114

Note:  The opinions that I write are my opinions and
are not necessarily the opinions of BCA.

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