RSJ Calcs - advice required

daleyw84 · 19 Sep 2017

Hi,

New to the site and just after some info and undertstanding. I'll apologise now for any incorrect terminology used!!

I've had an SE do some drawings for steels etc for an extension and just wanted to understand the drawings and calcs so that I can gather a few estimates for comparison against builders costs.

The main beams (twin bolted together) 305x137x37 show a span of 5m, there's notes that beams to have 250mm load end bearings.

My question is, do I need to add the load end bearing length to the overall span for estimates thus making 5500?

Thanks in advance.

D

Mr Chibs · 19 Sep 2017

I would say yes.

Paulg31 · 22 Sep 2017

If the clear span for the beams is 5000 mm yes you'll want to had on the 250 mm each end for bearing.

^woody^ · 23 Sep 2017

What are "load end bearings"?

250mm bearings are non standard. Normally half that.

tony1851 · 23 Sep 2017

Those beams are a crazy size for that span (assume they are supporting the back wall after a breakthrough?).
One of the 203 x 203 beams with a plate on top would suffice for that distance - 305 takes a lot off your headroom.

And as above, 'load-end bearings' means nothing. Has the SE designed padstones, or is the intention that the beams sit direct
on the wall?

For the actual length of the beam, you need the clear span plus the 2 end-bearing lengths (whatever they are).

daleyw84 · 25 Sep 2017

tony1851 said:
Those beams are a crazy size for that span (assume they are supporting the back wall after a breakthrough?).
One of the 203 x 203 beams with a plate on top would suffice for that distance - 305 takes a lot off your headroom.

And as above, 'load-end bearings' means nothing. Has the SE designed padstones, or is the intention that the beams sit direct
on the wall?

For the actual length of the beam, you need the clear span plus the 2 end-bearing lengths (whatever they are).

Thanks Tony, yes they're support the entire rear of the house - i've got reasonably high celings however i'm assuming the SE knows what he's talking about....

Padstones are 440 Long x 4 Course Deep x 100 Wide Engineering Brick for one of the beams and 550 Long x 5 Course Deep x 100 Wide Engineering Brick for the other.

And sorry I meant minimum 250mm "long" end bearings for both beams!!

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RSJ Calcs - advice required

daleyw84

Mr Chibs

Paulg31

^woody^

tony1851

daleyw84

DIYnot Local

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