UC to replace existing RSJ

[OzzyG]

I have recently got a structural engineer to draw plans to replace an existing RSJ which was keyed into the wall and resting on another wall with a beam and column on one side.

The plans call for a 152x152 30UC as the horizontal beam resting on a 100x100x4 column.

All the calculations are there and I have no reason to doubt the application of the beam itself, but i have never heard of a UC being used in place of a UB. Just looking for reassurance that there is nothing to worry about.

 

[^woody^]

They can be used no problem, when the properties of the column section are more suitable than a beam would be.

 

[John D v2.0]

UC just means that the width and height are the same, UB means that the most efficient amount of steel is used for the (strength) when used as a beam.
Often you would want the minimum depth rather than minimum amount of steel used, so you would pay for a more expensive and heavier beam in order to get that.
Or there may be other forces at play, but probably not in your case.
I put strength in brackets because it's a simplification but hopefully you get the idea

 

[tony1851]

UCs are often used under floors where reduced headroom might be an issue.

 

[steve daulby]

uc and ub are designations for universal beam and universal column. UC's are commonly used in refurbishment to minimise unsightly deep down stands or to hide beams within floors. They are less efficient so can be a little heavier, but much better aesthetically 152x152 uc's and 203x203 uc's are commonly used in refurbs.