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origin of old large tapered flange beam?

origin of old large tapered flange beam?

origin of old large tapered flange beam?

I am interested in finding out the likely origin of a large taper flange I beam (as a born and bred Brit I would normally call it a RSJ).  Overall depth 910mm (35.8"), width 420mm (16.5"), web thickness 20mm ((0.79"), flange 28 to 37 mm (1.1 to 1.5").

I am only asking out of plain curiosity (we already know the steel strength and have calculated the section properties); I have never come across such a section before.  (And "before" covers a fairly long span ).

None of my references show RSJs (would these be called S beams in the USA?) anywhere as large as these, which have been procured by an Aus contractor, who intends to use them for some temporary work.

RE: origin of old large tapered flange beam?

The beam would not be considered an "S" shape. It is just refered to as a 36" Beam. It was probably manufactured in the late 20's or early 30's. A good source of information is "Iron and Steel Beams 1872 to 1952" by AISC.
I looked and cannot find your beam exactly. However, there are beams listed which have properties that are very close. Considering rolling tolerances your beam is probably listed.

RE: origin of old large tapered flange beam?

It might be a UK Universal beam section. A 914*419*343 kg/m Ub section is 911.4mm deep, 418.5mm wide, flange 32.0mm web 19.4mm root fillet radius 24.1mm flange taper 3 degrees aprox

RE: origin of old large tapered flange beam?


You may well have got it.  I hadn't realised that a UK UB might have a tapered flange.

Is that the meaning of the # and + signs in the section name for the largest UBs when I read the BS Section Properties at http://www.corusconstruction.com/indexes/idxpr003.htm ?

RE: origin of old large tapered flange beam?

No - the + sign indicates that the section is not one of the British standard sections.
The # sign indicates a British standard section which is not rolled very often and availability may be difficult.

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