Jerry,
The Pr (prying factor) is not specific to the type of concrete or
it's compressive strength. It is an equation based on the geometry of
the hardware fitting for the seismic brace which connects to the
structure (not the pipe). Annex A.9.3.5.12.2 shows you the equations
used to generate that variable.
As predictable, the manufacturers are reluctant to release their
specific geometry to the public (and their competitors). If you have the
handbook there is some significant information on how the values in
Tables 9.3.5.12.2 (a-f) were developed. There is also information from
Powers Fasteners in the handbook showing an alternative to the values in
the table for 3,000# lightweight concrete.
Your best source of information on the Pr is to contact the device
manufacturer.
The above is my opinion as a member of the hanging and bracing
committee of NFPA 13, and does not express the position of anyone other
than myself.
*Ken Wagoner, SET
*Parsley Consulting***
*350 West 9th Avenue, Suite 206
*Escondido, California 92025
*****Phone 760-745-6181*
Visit our website <http://www.parsleyconsulting.com/> ***
On 04/19/2016 4:43 PM, Jerry Van Kolken wrote:
We are looking at the new tables for Concrete anchors in NFPA 13-9.3.5.12.2.
Where would one find the Pr value of concrete on a job?
Another question as well. We mainly use Tolco and Afcon EQ products. This
are all sized for ½” bolt connections. Does anyone know of a manufacture
that uses different bolt sizes?
Jerry Van Kolken
Millennium Fire Protection Corp.
2950 San Luis Rey Rd.
Oceanside, CA 92058
(760) 722-2722 FX 722-2730
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