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Re: Plywood shear wall definition

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A little clarification: the definition of the aspect ratio, per CBC Figure 23-II-, "General Definition of Shear Wall Height to Width Ratio," is based on the ratio of the clear height (measured between the bottom of the framing for the upper diaphragm and the lower diaphragm) to the width of the sheathing unless shear transfer is provided around openings. See the cited figure for the latter case.
 
Regards,
Bill Cain, SE
Berkeley CA
 
In a message dated 1/26/2005 12:07:55 PM Pacific Standard Time, Jnapd(--nospam--at)aol.com writes:
Mark:
 
1.    There is no problem switching plywood from outside to inside face of studs if all other requirements are completed as you stated.
 
2.    If the holdown strap is on the outside face there should be no problem.  Do not put on inside face.  If PHD holdown is used make sure they lineup. A little offset on the upper more to the center of the lower post. 
 
        I am assuming the studs change at the 2nd floor diaphragm.  The aspect ratio is between diaphragms, (ground to 2nd floor and 2nd floor to roof) not between ground and roof.
 
Are these thoughts to be used in a possible plaintiff or defendant position.
 
 
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA