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# re/ Fp Values

• To: seaint(--nospam--at)seaint.org
• Subject: re/ Fp Values
• From: Rick.Drake(--nospam--at)fluor.com
• Date: Thu, 16 Sep 1999 07:52:06 -0700

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The SEAOC Design Manual, Volume 1 is determining Fp consistently with the 1997
UBC.  I am assuming you are referring to Example 36 for two-story wall panels.
Wall panels are fastened at the top and bottom of the panel at two different
building elevations, each with its own calculated Fp value.  (Fp is a function
of elevation within building).  When designing items fastened to the building at
two different elevations, it is appropriate to design for the average value
calculated at the top and bottom of the panel.  Note that this "averaging"
applies to the panel only, not its connections to the building.

Hope this helps.

Rick Drake, SE
Fluor Daniel, Inc.
Aliso Viejo, CA

*****************************************************

To:   <seaint(--nospam--at)seaint.org> AT fdinet@ccMTA-fdlncta10
cc:    (bcc: Rick Drake/AV/FD/FluorCorp)

Subject:  Fp design value

there is a blue book circulating around my firm titled "seismic design manual",
volume 1 - code application examples, by the structural engineers association of
california.  in this manual a "new" way to calculate Fp (different than the 1997
ubc) has been shown.  i heard a rumor that i.c.b.o. had "accepted" the new
method.

here is how i see things:
Fp min = 0.7 * Ca * Ip * Wp (same as code)
Fp max = 4.0 * Ca * Ip * Wp (same as code)
Fp floor (at hx = 0) = ((Ap * Ca * Ip) / Rp) * Wp
Fp roof (at hx = hr) = Fp floor * 4
Fp design = ((larger of Fp min or Fp floor) + Fp roof) / 2
Fp design asd = Fp design / 1.4

my questions are as follows:
is this right?
do i have to design this way (since it is not in the code)?
are there other designers out there using this?

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