RSJ Loading

I've no idea. The beam is supporting a mezzanine floor in my barn which was put in by a tenant . The reason for my enquiry is that I wish to fit a beam trolley and a chain hoist to the RSJ.

It shouldn't be too difficult for me to estimate the current load on the beam, by finding out the volume and density of the timber used for the floor joists and that of the MDF flooring, then making an allowance for the likely weight of the material that I might store up there.
 

Ukjay

Member
Location
Wales!
Does this help with weight (I would say 71kg):

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Screen Shot 2018-02-24 at 16.43.36.png
 

dannewhouse

Member
Location
huddersfield
seems a silly thing to do use a column section where a beam should be?
the Ixx (second moment of area is the strength for bending) I bet a lighter beam section would have a similar value to them column sections.
 

Ukjay

Member
Location
Wales!
seems a silly thing to do use a column section where a beam should be?
the Ixx (second moment of area is the strength for bending) I bet a lighter beam section would have a similar value to them column sections.

No doubt on that for one moment, and I only referenced the Column data as a possible tool for the OP to try find the weight of the beam from the dimensions shown after the question raised by @skinnyhoskins, as I believe we should therefore work with what we are given, and the OP has given us the dimensions he has to calculate the load for.

The steel stockholders available on line from a search do not list a 200 x 200 Universal Beam, and only one stated a 'Universal RSJ' - but did not show any technical drawing / data, so as they can both be termed RSJ's in the market, all we had to work from is the dimensions the OP gave on his exiting steel.

Ironically the site listing the 203 x 203 Universal RSJ, has the same kg/m weight specification as a UC, which leads me to believe they may actually be quoting for an Universal Column:

UB Sizes Found (which do not list 200 x 200 unfortunately):

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Universal Columns

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Hopefully the data will help the OP, if someone knows how to calculate the data correctly.
 
Thanks for that. As measured off a ladder with a fairly worn tape measure, it doesn't seem to fit any of the sizes quoted above. In section, my beam is not like the sort of RSJ that I am used to, in that the flanges do not taper towards the edges but are parallel sided, which I imagine is easier on the trolley wheels.
 

Forever Fendt

Member
Location
Derbyshire
I've no idea. The beam is supporting a mezzanine floor in my barn which was put in by a tenant . The reason for my enquiry is that I wish to fit a beam trolley and a chain hoist to the RSJ.

It shouldn't be too difficult for me to estimate the current load on the beam, by finding out the volume and density of the timber used for the floor joists and that of the MDF flooring, then making an allowance for the likely weight of the material that I might store up there.
is the beam bolted to other steels or is it built on pad stones and walls as i think the supporting ends will be a concern than the deflection of the beam
 
It's bolted to the RSJ uprights of the barn.
The range of beam trolleys and chain hoists seem to start at a half tonne capacity. I don't really want to go much beyond that. Some chain hoists can even be had with a safety cut out so they can't be overloaded.
 

Ukjay

Member
Location
Wales!
Thanks for that. As measured off a ladder with a fairly worn tape measure, it doesn't seem to fit any of the sizes quoted above. In section, my beam is not like the sort of RSJ that I am used to, in that the flanges do not taper towards the edges but are parallel sided, which I imagine is easier on the trolley wheels.

It sounds to me as though you may have a column then if it is squared - plus they normally do not the the normal tapered flanges like the normal Rolled Steel Joist have.
You may find it is a 203 x 203 (nominal size steel), as the tooling can be out slightly from the nominal to give a variation.

Are you able to use a vernier or a more accurate way on the end section to measure the flange, web etc?
 

Forever Fendt

Member
Location
Derbyshire
It sounds to me as though you may have a column then if it is squared - plus they normally do not the the normal tapered flanges like the normal Rolled Steel Joist have.
You may find it is a 203 x 203 (nominal size steel), as the tooling can be out slightly from the nominal to give a variation.

Are you able to use a vernier or a more accurate way on the end section to measure the flange, web etc?
The heavier weights in the section size will be bigger than the noted size (203) as the extra flange thickness goes on the outside as the web stays constant
 

Hairy Bob

Member
Do you have a firm nearby that supplies/tests lifting gear? I'd advise getting a pro to look at it and test it, then you know what the safe working load is and you'll have a certificate to show your insurer, rather than relying on strangers from the internet.
As has been alluded to, H section (universal column) is more suited for use in a vertical position. For a horizontal beam you get more strength for less metal with I section (universal beam). You might be surprised how much it deflects over that span, although the gussets on the end plates will certainly help.
 

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