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Re: concrete vibrational analysis
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- Subject: Re: concrete vibrational analysis
- From: Bruno Côté <bocte(--nospam--at)ibm.net>
- Date: Sun, 05 Apr 1998 23:08:49 -0400
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 > This is a bridge engineer's opinion on a building issue. The dynamic effect of loads is influenced by the mass and the stiffness of the structure. The bigger the mass and the more flexible the structure, the less dynamic effects will be felt by the structure. Even though the stiffness of the concrete floor should be significant, I would believe that the mass of the floor would dampen most of the dynamic effects. If the live load capacity of the floor is as per code requirements, my gut feeling would be that there would not be any problems. As far as the natural frequency of the floor is concerned, I am assuming that you are concerned about the floor going into resonnance with the people jumping up and down. For what this is worth, I never heard any stories about this happening. I would suspect it is not a problem. Maybe the reason why you did not find any documentation on the dynamics of concrete floor is that it is not a problem. If you really want to calculate the natural frequency, I would suggest the basic formula w=(sqrt(k/m)) where w=2x3.14xfrequency, m=mass of floor and k=stiffness. In order to get the stiffness, I would apply a unit load to a plate and verify what the deflection is. You might want to consider the stiffness of the drop panels by reducing the size of your plate. The mass would be the mass of the plate (in slugs not in pounds). Make sure all units are consistent if using this formula. Bruno Côté BOCTE(--nospam--at)ibm.net
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