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Re: Nail Slip

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Nels, I will send you the derivation when I get to the office.
John Rose/APA

Nels Roselund wrote:

> The list seems to have been down temporarily yesterday -- I'm not sure that
> my question got delivered to the list so I ask it again:
>
> >I'm working with the UBC formula for deflection of a plywood sheathed shear
> wall in Section 23.223 of UBC Standard 23-2.
>
> The deflection determined by the formula and each of the terms in the
> equation for shear wall deflection have units of length except the nail slip
> term, which has units of length x length (h has units of inches, and en --
> according to Table 23-2-K has units of inches).
>
> What am I missing?
>
> Nels Roselund
> Structural Engineer<
>
> I've concluded that the value of en must be unitless, instead of in inches
> as stated in the Table.  I'm surprised that I haven't realized the apparent
> discrepancy before -- I've used the formula for years.  The value of en is
> stated as being in inches in my Wood Engineering Handbook by Faherty and
> Williamson, and in the diaphragm deflection formula in the 1973 UBC, though
> in both places it results in a discrepancy in the units.
>
> Is there a derivation of the formula out there?  Is there a different
> explanation?
>
> Nels Roselund
> Structural Engineer
>
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