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Partial (to?) sisters

Posted by JT on October 10th, 1997 07:05 PM
In reply to Sistering Deck Support Beams by Brent Altman on October 10th, 1997 06:21 PM [Go to top of thread]

Sounds like you are looking to add stiffness to a
marginal span. Unless you have the structural
engineering expertise to calculate the effects of
such non-standard constructs, I'd say avoid them.
There is an excellent article in the current issue
of Journal of Light Construction about "bouncy"
floor systems and how to avoid them. The thing I
found interesting is that floors with a natural
(i.e. resonant) frequency of 8-10 Hz were judged
to bouncy. This, they point out, happens to be the
resonant frequency of our intrenal organs. At about
15 Hz floors were judged acceptable. They suggest
upsizing from the normal L/360 deflection to L/480
for floors not supported by a girder. It gets more
complicated of there is a girder.

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