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FEMA 302

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Has anyone noticed that the factored shear values for wood shear walls in FEMA 302 NEHRP
Recommended Provisions for Seismic Regulations for New Buildings and Other Structures
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