Guys,

We are looking to put a mezzanine floor in out workshop. 8m x 8m.

We want it to be single span if at all possible. It will be laden with an evenly distributed 10 tonnes at most plus the racking and the floor boarding.

Can anyone advise on size of steel section required for the cross beams required for a single span?
Thanks

[Edited on 7/9/10 by locoboy]

To design for that you need to know the load per square meter. Is it 10 tonnes evenly spread over the 64 square meters?

Cheers

Fred W B

It's probably not evenly distributed but I feel the 10000 kg is well over spec'd given that the floor space will only be about 40% covered with racking and the rest will be walkway / packing bench.

[Edited on 7/9/10 by locoboy]

The next question, is what spacing of the beams will your floor structure let you use?. i.e how may cross beams?

Once the number of beams are set (we would presume the beams will be simply supported) its a simple deflection calculation, but are their any building codes that have to be met? Some codes set a minimum floor load design criteria.

Cheers

Fred W B

I can have as few or as many cross beams as required.
The building is 8m wide and we want to come out from the back wall by 8m.

So running across the width of the building i can have as many beams as required which can be supported with steel uprights bolted to the floor/wall.

Then in between my steels i can run timber front to back to screw the floor to.

Obviously the lighter duty the beam the more i need .& the more uprights i need = more fabricating and man hours, so its a trade off between the price of fewer heavier guage beams and uprights or lighter duty and more man hours.

Sorry, took a while to get to this.

So assuming:

Span of 8 metres.
Load of ten tons uniformly spread over 64 m2.
Simply supported beams.
Design for allowable stress, which equates to max centre deflection under assumed load of 18 to 22 mm.
First and last cross beam are at extreme ends of floor

You could use:

8 beams of IPE - 180 at centres of 1 143 mm
9 beams of IPE - AA 180 at centres of 1 000 mm
10 beams of IPE - 160 at centres of 889 mm

If you go to 11 (800 pitch) or 12 beams (737 pitch) you still need the IPE 160, a IPE 140 will not make it.

IPE - 180 is 180 high, 91 wide, flange thickness 8, web thickness 5.3 (kg /M = 18.6)
IPE - AA 180 is 176.4 high, 91 wide, flange thickness 6.2, web thickness 4.3 (kg /M = 14.9)
IPE - 160 is 160 high, 82 wide, flange thickness 7.4 web thickness 5 (kg /M = 15.6)

Hope this helps

Cheers

Fred W B

[Edited on 10/9/10 by Fred W B]