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Re: metal strapping on wall lines

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I agree with Paul. It could be to deliver the drag forces. Perhaps there is a break in the top plate due to a need to have the header very high up and the straps are there, or perhaps the forces are too large for a double top plate to transfer the could be a number of things.


On 9/15/06, Paul Feather <PFeather(--nospam--at)> wrote:

If it is a single panel between two openings then the straps are for shear transfer to the panel.  You can look at the plates as the drag element, or possibly the engineer looked at the shear wall segments above the adjacent windows as the drag element, or possibly the engineer was being true to statics and looking at the panels above the windows and unqualified piers as having to transfer half to the plates and half through the header system for in-plane wall forces.

From: Pinyon Engineering [mailto:Pinyonengineering(--nospam--at)]
Sent: Friday, September 15, 2006 8:13 AM
To: seaint(--nospam--at)
Subject: Re: metal strapping on wall lines


The shearwall is not perforated -- the shear wall segment is about 10' long with windows on each side and then pier that don't meet aspect ratios. also the SW nailing is only on the 10' section (3 & 12) with 6 & 12 nailing outside the shearwall segment and holddowns at the ends of the 10' segments. a perforated SW needs specific construction requirements I can't see the required or installed requirements.   is this just more work for an undefined increase in strength?

a while ago I had a contractor insist a 10d nail is stronger than an 8d nail in a flat block.  I ran the numbers with the penetration of the nail factored in (2001 CBC code-- 1997 UBC rules)  the 10d calc. was only a few lbs stronger.  so more is better but by how much and what effort? if someone is just trying to meet the low bar set by the code.


Tim Rudolph

Pinyon Engineering




Why do you state that it not a perforated shearwall? If you poke a hole
in a sheathed wall, it is a perforated shearwall regardless of how you
chose to analyze it.  And regardless of how you analyze it, it's
stronger with reinforcing around the opening.
Chuck Utzman,PE