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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: "Dennis Wish" <dennis.wish(--nospam--at)verizon.net>
• Date: Wed, 2 Jun 2004 13:45:24 -0700

```Jason,
Actually, I saved your post from back in October of 2003 that discussed this
exact issue in depth - it was very complete, but I lacked the time and
knowledge to be sure that I was following you correctly. I know understand
this (concrete is not my strong point as I do very little with it).

Thanks for posting this as it is similar to what you posted last year and I
know have a better handle on the equivalency of the bars to wwf.

Dennis

Dennis S. Wish, PE

California Professional Engineer

Structural Engineering Consultant

dennis.wish(--nospam--at)verizon.net

http://www.structuralist.net

-----Original Message-----
From: Jason W. Kilgore [mailto:jkilgore(--nospam--at)leok.com]
Sent: Wednesday, June 02, 2004 1:27 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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