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Re:FEMA 302

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Sam,

You are correct in your statement that the 1997 NEHRP Provisions has higher
shear values for wood shear walls. The 97 Provisions do in fact use LRFD
(strength) design for wood design.  ASCE 16-95 is referenced in the text of
Chapter 12.  

Tim Sheckler

___________________________________
Tim Sheckler, P.E.
Federal Emergency Management Agency 
National Earthquake Program
500 C St., SW  Room 416
Washington, DC 20472
(202) 646-2834
tim.sheckler(--nospam--at)fema.gov


____________________Reply Separator____________________
Subject:    FEMA 302
Author: seaoc(--nospam--at)seaoc.org
Date:       7/7/98 9:13 AM

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