Beam sizing.

[vedeldaren]

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Wood weighs about 500Kg/m^3. Steel just under 800,000 kg/m^3. A difference of 1:1600.

Byggaren

Wood weighs between about 600-850 kg per cubic meter (pine vs. oak) and steel weighs about 7710-7880 kg per cubic meter (stainless vs. high-alloy) a difference of about 1:12.85 or 1:9.27

 

[imported_Byggaren]

Wood weighs between about 600-850 kg per cubic meter (pine vs oak) and
steel weighs about 7710-7880 kg per cubic meter (stainless vs high alloy) a difference of about 1:12.85 or 1:9.27

Oh crap! Did I now include a few too many zeros when I calculated the weight of the steel I apologize.
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Byggaren

 

[Xiter]

But wood can only withstand about 15 MPa against steel's approximately 200 MPa. A difference of 1:13.333, compared at the highest quality (glulam vs. construction steel in class S 355 J2 G3).

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Byggaren

Now I think you were too quick again; Stress=MPa=N/mm^2

Skip "/mm^2" and it will be correct...

 

[vandame]

Funny with many responses in the thread, but I'm not sure if I'm getting any wiser . Kempa. 355kvalite, is that a measurement or is it the quality of the beam?
Stopped by a blacksmith's workshop today and measured what was out there, and it was 12x6.5 (heightxwidth). Is that enough? Throwing in a picture.. Is this what's called an I-beam?

 

[blackadder]

355 is the quality of the beam and yes, it's an I beam.