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RE: FEMA 302

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For what it's worth, the values are identical for 7/16" plywood in the 1994
UBC and the 1st Draft of the IBC.

Bill Allen

-----Original Message-----
From: Sam Love [mailto:loveengr(--nospam--at)]
Sent: Tuesday, July 07, 1998 8:20 AM
Subject: FEMA 302

I fixed the chart format below and have sent this a second time.

Has anyone noticed that the factored shear values for wood shear walls in
Recommended Provisions for Seismic Regulations for New Buildings and Other
Table 12.4.3-2a are about 17% higher than the 1997 UBC allowable values?

For 7/16" OSB with 8d nails the shear per linear foot is:

    NEHRP                                                     UBC
6" O.C.  4" O.C.  3" O.C.  2" O.C.    6" O.C.  4" O.C.  3" O.C.  2" O.C.
280 plf   410 plf    530 plf   680 plf     240 plf   350 plf   450 plf
585 plf

Is NEHRP based on Ultimate strength while UBC is based on working stress?
This is very
important since the 2000 IBC structural provisions will come from NEHRP.

Sam Love
Love Engineering
Ogden, Utah