Dimension of beam

[moroten]

If weight is more significant than height, one could choose an IPE330 instead, which weighs about 20kg/m less and is probably a cheaper solution as well.

Yes, it should be cheaper, 120kg lighter indeed.
You seem to have a good grasp of the situation 👍
distributed load versus point load
Is there much difference?
Just trying to understand how he arrived at that beam.

 

[Gabbe1]

If you account for a 10-ton point load in the middle, more than 16000cm4 is needed instead, which an HEA300 achieves with a good margin.

The 10 tons I'm accounting for are moreover generously estimated if the roof area and snow zone you've specified are accurate. 30m2 of roof tiles weigh just over a ton, then the snow load is six tons. Half of the truss weight can't be many hundred kg, so the actual load at maximum snow load is likely closer to 6.5 tons than 10.

Was it possible that your designer wanted an HEA240 but you misunderstood it for an HEA340? An HEA240 matches very well if you consider a 6.5-ton distributed load. (or an IPE300 as a cheaper alternative)

 

[moroten]

No unfortunately not.
I'll have to bring it up with him.
Thanks for the help

 

[ljungpiparen]

An IPE beam spanning 6m+ might be well served by some form of lateral bracing as the IPE beam is quite slender and prone to buckling.

 

[Lutte]

IPE beam spanning 6m+ might be good to brace laterally in some way since the IPE beam is quite slender and prone to buckling.

This is usually solved with web stiffeners where you have columns/supports and where you have point load from above.