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Re: nds dowel bearing strength

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The results are useful for retrofitting of typical wood sill anchors, in
that you need not require excessive embedment, which could result in
spalling in stemwalls, yet still develop the required bolt strength.

Pat Clark

----- Original Message -----
From: "da" <dadie(--nospam--at)sbcglobal.net>
To: <seaint(--nospam--at)seaint.org>
Sent: Saturday, September 28, 2002 4:45 PM
Subject: Re: nds dowel bearing strength


> > Is the concrete strength that relevent?  Shouldn't the wood strength
> nearly
> > always control?
> >
> > Pat Clark, P.E.
>
> basically my question arose because i was developing a spreadsheet for non
> typical applications.  what i found was pretty interesting.  the 6.0 in
min
> concrete embedment is conservative to very conservative for table 8.2E.
the
> table below shows what i came up with for the REAL min embedments in f'c =
> 2000 psi concrete & douglas fir (G=0.50) - (to obtain the exact same table
> values).  yes i know that these numbers are too small for normal design
use.
>
> side member thk / bolt dia / real min embedment
>
> 1.5 / 0.5 / 2.25
> 1.5 / 0.625 / 2.5
> 1.5 / 0.75 / 3
> 1.5 / 0.875 / 3.5
> 1.5 / 1 / 4
>
> 2.5 / 0.5 / 2.25
> 2.5 / 0.625 / 3
> 2.5 / 0.75 / 3.25
> 2.5 / 0.875 / 3.75
> 2.5 / 1 / 4.25
>
> 3.5 / 0.5 / 2
> 3.5 / 0.625 / 2.75
> 3.5 / 0.75 / 3.25
> 3.5 / 0.875 / 4.25
> 3.5 / 1 / 4.5
>
> i call this table "8.2E2 - bolt design values (Z) for single shear (two
> member connections)
> for sawn lumber to masonry" - f'm = 1500 psi, FEM = 3 * f'm = 4500 psi,
> douglas fir (G=0.50)
> the Z parallel values are about 93% of the concrete values in the table
and
> the Z perp. values are very close to equal to the concrete values.
>
> side member thk / bolt dia / real min embedment / Z parallel / Z
> perpendicular
>
> 1.5 / 0.5 / 2.5 / 580 / 350
> 1.5 / 0.625 / 3 / 830 / 500
> 1.5 / 0.75 / 3.5 / 1140 / 580
> 1.5 / 0.875 / 4 / 1510 / 620
> 1.5 / 1 / 4.5 / 1940 / 670
>
> 2.5 / 0.5 / 2.25 / 670 / 440
> 2.5 / 0.625 / 3.5 / 1050 / 570
> 2.5 / 0.75 / 4 / 1390 / 740
> 2.5 / 0.875 / 4.5 / 1760 / 950
> 2.5 / 1 / 5 / 2170 / 1110
>
> 3.5 / 0.5 / 2.25 / 670 / 460
> 3.5 / 0.625 / 3.25 / 1050 / 690
> 3.5 / 0.75 / 3.5 / 1520 / 840
> 3.5 / 0.875 / 4.75 / 2070 / 1030
> 3.5 / 1 / 6 / 2550 / 1250
>
> hago
> da
>
>
>
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