Hi everyone! I've decided to remove a load-bearing wall to open up the kitchen, dining room, and living room. I checked building descriptions and made a simple calculation (see attached), but the issue is, as you know, that laminated beams add too much height! So my question is, which dimension of HEA or HEB could work instead? And what calculations does the building department require for a building permit application?
It should require a K-drawing by a konstruktör. Many can call themselves konstruktör, but one should possess sufficient knowledge for the task.
In theory, you can compare I*E for respective glulam and HEA and thus get a dimension based on your produced beam. But I recommend bringing in a consultant so you also have good drawings for the building application.
In theory, you can compare I*E for respective glulam and HEA and thus get a dimension based on your produced beam. But I recommend bringing in a consultant so you also have good drawings for the building application.
I also think you should get help from someone. You have calculated a distributed load of about 20 kN/m on the beam, which sounds a bit excessive. At the same time, your answer, 90x360 is too weak regarding deflection. With 20 kN/m you need a HEA 180 beam. If you reduce the opening dimension by a couple of decimeters, you could use 215x270 glulam, still assuming 20 kN/m.
If you are sure about the floor plan, a constructor is better in this case.
@justusandersson may I ask where the weight of the roof and the snow load come into play in the Building Descriptions calculation with regard to the dimensioning of the beam? On the website, there is nowhere to specify the c/c distance between the rafters.
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I know as little about that as you do. I am skeptical of that tool and have no knowledge of it. I just calculated backwards using the information about beam dimensions and deflection. Without roof truss c/c and support leg placement, it's difficult to calculate the roof loads.
I agree. I did my own calculation to compare and get the total line load to approximately 19 kN/m. I have accounted for the live load (2 kN/m2) as well as the dead weight of the floor joists and beam.
The transfer beam isn't subject to other loads, is it?
The transfer beam isn't subject to other loads, is it?
It depends on the roof construction.
If one assumes frame truss (then the self-weight of the underframe is added).
Well, not entirely. But it would be good if one could see how they think with the calculations, assumptions, etc.L link74 said:
EDIT: I saw that it states the calculations are performed with Statcon, a dimensioning program as well. I quickly become skeptical of things I can't verify myself.
I largely share @scorp1ons' view. I mentioned that I'm skeptical, but I've never used the tool. I believe its use must be based on pretty good prior knowledge so that one can question the result. As my math teacher ingrained: Is the answer reasonable?L link74 said:
Nice area you live in. I've visited Skräcklestugan many times. When was your house built?