Structural Beam Connections

Ernesto Di Michele · 12 Feb 2020

Having a bit of a mare with a couple of steels the have been delivered this week.
We have a 7m 203x203x86 beam holding up rear of house and a 203x133x25 beam that connects to it to hold up an upstairs return wall. The connection specified was notching and welded end plate with 4 bolts that connect into web of larger steel. Fairly standard stuff. So apart from the bottoms not lining up as specified the notch on the smaller beam is huge, nearly a third of the beam depth. Are there guidelines on maximum depth of notch allowed, I'm sure this affects structural integrity of beam.
Thanks in advance, Ernesto.

^woody^ · 12 Feb 2020

Get your structural engineer out for a look

tony1851 · 12 Feb 2020

If it's just supporting domestic loading, taking 1/3rd off the depth at the bearing is not going to compromise strength.
The only issue at the end of the beam is shear force on the web; you'll have around 140mm of web left (?) so that would be fine.

Ernesto Di Michele · 12 Feb 2020

tony1851 said:
If it's just supporting domestic loading, taking 1/3rd off the depth at the bearing is not going to compromise strength.
The only issue at the end of the beam is shear force on the web; you'll have around 140mm of web left (?) so that would be fine.

I will need to measure this but think nearer 130mm... why on earth they trimmed out so much is beyond me as it only needs to clear bottom flange of main beam

tony1851 · 13 Feb 2020

It could go down to lower than 130 and still be OK.
Here's one supporting an external wall where they went over-enthusiastic in cutting the web to accomodate a lean-to , but it worked.

Paulg31 · 14 Feb 2020

A 7 m span for a 203UC is quite slender. Span to depth of 34.

tony1851 · 14 Feb 2020

Paulg31 said:
A 7 m span for a 203UC is quite slender. Span to depth of 34.

Yes, wondered about that; be interesting to know what limit SE has assumed for deflection, particularly with a point load from the incoming beam.

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Structural Beam Connections

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