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RE: ACI 318 section 12.2.4

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Development length of your horizontal bars is critical if it is a shear wall. However, the top bar factor was never intended to apply for walls.
-----Original Message-----
From: GSKWY(--nospam--at) [mailto:GSKWY(--nospam--at)]
Sent: Friday, March 22, 2002 10:15 AM
To: seaint(--nospam--at)
Subject: Re: ACI 318 section 12.2.4

The alpha factor is also sometimes called the "top bar factor".  Basically,  it accounts for the fact that in deep members, you are likely to get some settlement (resulting in small voids) below the bars and the bond between the bar and concrete may not be as strong as if there was no settlement.

It does not apply to vertical bars.  I suppose it applies to horizontal bars in walls but development length is not critical in most walls.

Gail S. Kelley, P.E.