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# Re: concrete vibrational analysis

• To: seaoc(--nospam--at)seaoc.org
• Subject: Re: concrete vibrational analysis
• From: Sleiman Serhal <mony(--nospam--at)destination.com.lb>
• Date: Mon, 06 Apr 1998 20:15:55 +0200

```terrence turner wrote:
>
> I am presently designing the floor system for a health/areobics club.  My
> question deals with the following,  how do you calculate the frequency of
> vibration for a concrete flat slab with drop panels?  I have seen alot of
> publications dealing with vibrational problems for steel but rarely for
> concrete.  Any help would be much appreciated.
>
> thanks
>
> Jon Turner
>

Floor systems with a natural frequency greater than 5 cycles per second
should have no problems of vibration.

The following equation can be used to compute the natural frequency:

f=3.5*sqrt(1/D)

with D being the immediate static deflection at the center of the floor
due to the loads expected, in inches.

You can find all that in MacGregor's Reinforced Concrete book.

Moni Serhal

```