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Re: Floor Vibration

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Try to get a hold of "Floor Vibrations Due to Human Activity," Steel Design Guide Series 11 published by AISC. It is very specific about designing and analyzing floor vibration problems. It should be able to answer most of your questions, otherwise contact Dr. Thomas Murray at Virginia Tech. :-)

People can be annoyed by vibrations at a wide range of frequencies. It will depend also on the duration, acceleration, etc...  To specifically answer you question one also has to know what the peak acceleration is to match it up with standards. At 8Hz the peak acceleration will have to be lower than it would at 15 Hz. The recommended acceleration limit for a shopping mall is 1.5%, but an office is 0.5%.

Richard Lindenberg
Davis, Bowen & Friedel, Inc.

On Wed, 1 Mar 2000 08:15:26 -0800, seaint(--nospam--at) wrote:
>     I know I have it somewhere but I can not find it now. I have read a  
>paper where the natural frequency of a floor system was compared to the  
>level of comfort humans feel. I am looking at a floor system using W8  
>members to span 23 ft. The floor beams are on 5 ft. centers. The deflection  
>criteria of table 16A-D is meet however the system has a natural frequency  
>of 8 hertz. This  seams low to me. If my memory is not to bad about 15  
>hertz is where humans feel comfortable  walking on floors.
>     Thanks for any help.
>Acie Chance
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-- Richard Lindenberg, rel(--nospam--at) on 03/01/2000 at 11:44:39 AM