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RE: Wood Shear Wall Top Plate Shear Transfer

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The diaphragm load is distributed along the entire length of the dbl top plate assuming, as David points out, adequate top plate splicing.  For an interior shearwall, with load being taken out of the diaphragm to each side, the allowable load of the diaphragm along that line is effectively doubled.  Looked at another way, the nail or connector  spacing to the top plate is halved.  The load is taken out of the top plate and into the shearwalls with shearwall edge nailing, which is determined based only on length of shearwalls on that line.



Gordon Goodell




From: Michel [mailto:mblangy(--nospam--at)]
Sent: Tuesday, August 12, 2008 5:30 PM
To: seaint(--nospam--at)
Subject: Re: Wood Shear Wall Top Plate Shear Transfer


It is the unit shear from the diaphragm that is to be transfered into the top plates.

----- Original Message -----

From: David Topete

Sent: Tuesday, August 12, 2008 3:56 PM

Subject: Re: Wood Shear Wall Top Plate Shear Transfer


if the dbl top plate is continuous, then the nailing of the sheathing to the dbl top plate takes care of the shear transfer.  The top plate must be adequately spliced along its length for the collector load.  If light-framed, omega level forces are not used.  hth.

On Tue, Aug 12, 2008 at 3:10 PM, Michel Blangy <mblangy(--nospam--at)> wrote:

Hi David,


Double top plate collector continuous over the wall and extending the full length of the building.




Is the collector continuous over the wall?  If "collector" is discontinuous (i.e. blocking o/ wall), you still need a tension strap for force transfer, but connectors from blocks to top plate.  what are you asking?

David Topete, SE

David Topete, SE