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Re: Simpson Strongwall Question

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What is a Simpson Strong Wall?

Rajendran
rajendra(--nospam--at)edumaster.net


JAA wrote:
> 
> Dear Steve:
> As you mentioned, "current allowable shear values as set forth in the
> building codes" are just that. Allowable shear values in the code are
> for plywood, or OSB, by itself, with a specific nailing pattern, nothing
> more. It is up to the Engineer of Record to check the overturning
> stresses in the shear wall assemble, and all of it's parts. This
> includes, but is not limited to, the following:
>         1). The capacity of the end posts, in compression, when subjected to
> vertical loads as well as simultaneous overturning forces. The Tables
> that Simpson has produced, do not include the reduction due to vertical
> Dead and Live loads, which must be added to the overturning force. This
> should reduce the allowable capacity of the Strong Wall.
>         2). The sill plate (or in the case of the Strong Wall, plywood and
> floor joists at the second floor) and its related crushing (compression
> perpendicular to the grain) due to overturning, and vertical loads
> acting simultaneously. The Tables by Simpson seem to disregard this
> second floor condition.
> 
> When I calculated the compression under the end posts I discovered that
> it overstresses the plywood, and the joists below, in crushing (ie.
> compression perpendicular to the grain), even with no vertical load is
> added!! Let me know your thoughts on this.
>                 Best Regards, Jim
>