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Fwd: Re: floor deflections

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Christopher Wright wrote:
> >The premise is that long span wood
> >joist system peform best when the fundamantal frequency of vibration is
> >held below 15 Hz.
> This sort of thing is smart engineering because it ties in dead load and
> stiffness, but I wonder if the criterion should be 'above 15 Hz' The
> lower the frequency the softer the system
> Christopher Wright P.E.    

You are absolutely correct. Frequency should be higher. This was pointed
out by several others also and I'm encouraged that everyone is paying
such close attention! But of course we're engineers and even spell
checkers wouldn't find that one!

Apologies to you all.

Barry H. Welliver

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Richard Lewis, P.E.
Missionary TECH Team

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