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RE: Natural Frequency of a Noncomposite Floor System[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Natural Frequency of a Noncomposite Floor System
- From: "Ashraf, Mohammed \(Qatar\)" <mohammed.ashraf(--nospam--at)worleyparsons.com>
- Date: Mon, 12 Jun 2006 14:30:59 +0300
Title: RE: Natural Frequency of a Noncomposite Floor System
It would be helpful you to look to Section CB serviceability considerations of ASCE 7-02. It says that fundamental natural frequency for mitigating walking vibrations should be above 8 Hz which in turn limits static deflection under uniform load to be 5mm independent of span. But the code says many floors not meeting this criteria are perfectly serviceable.
Hope this would help you.
From: Brian S Bossley
Would it matter if this was equipment vibration though? I know that floor vibrations due to human activity are on a low frequency, but this equipment may be on a higher frequency. Would I have to consider my natural frequency in two different ways (one for low frequencies and one for higher frequencies)? If so, what would be the cut-off vibration frequency?
From: Carter, Charlie
Floors tend to behave as composite -- whether they
have studs or just puddle welds -- within the low range of loading that
vibration is a design criterion, hence the recommendation. I'm not sure what
software program you're using, but you might ask them why. Perhaps they have
followed a different method or have accounted for the composite action in
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