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# RE: What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF
• From: "Jason W. Kilgore" <jkilgore(--nospam--at)leok.com>
• Date: Wed, 2 Jun 2004 15:41:55 -0500

```Oops, I looked at the wrong column in the table.

Yield stresses for WWF are 65-70 ksi

Change my spacings to 13 and 14 in. o.c.

So far, the answers to this question have ranged from 11.4" (mine, which was
wrong) to 37" o.c., with lots of variation in between.

Plenty of range to choose from.

IMHO, the best answer you have received so far is to check out the WRI web
site at http://www.wirereinforcementinstitute.org/

---
Jason Kilgore
Leigh & O'Kane, LLC
Kansas City, Missouri

> -----Original Message-----
> From: Jason W. Kilgore [mailto:jkilgore(--nospam--at)leok.com]
> Sent: Wednesday, June 02, 2004 3:27 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF
>
> As WWF = 0.029 sq. in. per strand * 2 strands per ft = 0.058 sq. in. per
> ft.
>
> Equivalent area #3 bars = 0.110 / 0.058 * 12 = 22.75" o.c.
>
> Also, since it's not a structural slab, you can take advantage of the
> higher strength of WWF - 70-80 ksi.
>
> Equivalent STRENGTH (80 ksi vs. 40 ksi rebar): 22.75 * 40/80 = 11.4 in.
> o.c.
> Equivalent STRENGTH (70 ksi vs. 40 ksi rebar): 22.75 * 40/70 = 13.0 in.
> o.c.
>
> I'd say use 12" o.c.
>
> ---
> Jason Kilgore
> Leigh & O'Kane, LLC
> Kansas City, Missouri
> ________________________________________
> From: Dennis Wish [mailto:dennis.wish(--nospam--at)verizon.net]
> Sent: Wednesday, June 02, 2004 2:50 PM
> To: seaint(--nospam--at)seaint.org
> Subject: What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF
>
> Sorry, I forgot to give you the grid spacing on the WWF - it's
> 6x6/W2.9xW2.9 - this is most commonly used WWF in our area for SOG's - no
> expansive soils to worry about, all silty sand - no organics.
>
> Can someone tell me what the equivalent layout is for #3 Fs=40ksi rebar in
> a 6" thick concrete (f'c=2,500 psi) slab on grade to replace the normal
> W2.9xW2.9 Welded Wire Fabric?

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