Fitness Center Live Loads 1

[preynolds]

I am analyzing an existing building in which the architect proposes to place a fitness center. I am currently going to use 125 psf LL for the floors but have unable to find any reference or code verifying 125. Can anyone lend assistance as to whether or not 125 will be sufficient and possible documentation?

Thanks
Pat

 

[Taro]

What building code? 125 psf seems like the right ballpark. Although fitness centers are not listed specifically, IBC 2003 gives minimum loads of 100 psf for similar uses (dance halls, gymnasiums, stadiums).

It should be noted that the code prescribed live loads are minimums. If the anticipated live load is greater, you have to use the higher load.

It would be a good idea to design the floor for a concentrated load (say 1,000 to 2,000 lb) as well. Some weightlifting machines and storage racks can be quite heavy. Try to get a list of equipment weights from the owner.

Another consideration is vibration, especially if there will be aerobic classes or other rhythmic movements. These types of vibrations can be very disruptive to occupants of other spaces, even several stories away.

 

[preynolds]

thanks. the code is IBC 2003. I think we are going to run with the 125 until there is significant evidence either way.

 

[fleisher]

Should also check with AISC Design Guide 11 - Floor Vibrations due to Human Activity. Section 5 deals with vibration due to rhythmic activities.

 

[CSEllc]

125 psf is what I have used in the past.

Two things you should also check are: 1. floor vibration as mentioned by fleisher and 2.) the weight of the weightlifting machines and storage racks. While I doubt the beams and girders will be overstessed, the concrete slab might need additional reinforcing due to the localized loads.

 

[rmw]

I have to agree with Taro. Some specific areas, like the machines and weight racks he has mentioned can get pretty heavily loaded. You ought to see the weight some of the "HE" men can put on one machine or bench at the club where I work out.

rmw

 

[BigH]

Concentrated loadings can be high - I used to use 750 pounds on 45deg leg press but that might be light compared to me just standing there! There is a question in that you never know where the concentrated loadings will be. Fitness centres have been placed in normal office buildings without the designer likely knowing that such would happen. Why not check out some fitness centres in your city and find architect/structural designer and see what he used.

 

[SlideRuleEra]

I am working on a project that includes aerobic classes in a steel fram building. Just came upon an article in AISC's "Modern Steel Construction" magazine, March 2001 issue. It address floor vibration from such activities. The article is free and avialable in .pdf format at:

http://www.aisc.org/ContentManagement/ContentDisplay.cfm?ContentID=910

 

[3dboy]

don't forget the increase in loads due to lots of fat people in one place!

 

[preynolds]

3dboy,

Do I need to comment on your total lack of class?