Sizing Glulam Beam

[Bredare]

Hello.

I hope someone knowledgeable here can assist with the sizing of a glulam beam.
If needed, drawings can be arranged, but I hope my description suffices.

Opening of an interior wall, from one gable and 5400 mm into the house. Thus, I assume a beam of about 5600 mm is required to include support.

The house is located in snow zone 1.5.

It is a 1.5-story house, with a finished attic, insulated roof with concrete roof tiles (built in the early '90s).
The space directly above the intended beam is a bedroom.

The floor joists are 45x170 mm, and are connected with roof beams in the attic according to a typical 90-degree triangle construction. The floor joists are at 600 mm centers, and the roof trusses are at 1200 mm centers.

The width of the house is 6400 mm.
The distance to the load-bearing wall from the exterior wall is 3700 mm and thus 2700 mm on the other side. The wall is therefore not centered in the house.
The width of the upper floor, i.e., the room's surface area, is 4200 mm.

Enclosed is a poor quality, example picture to better explain.-

Grateful if anyone has the knowledge or software to calculate it. Svenskt Trä dimensioning unfortunately does not extend beyond 5000 mm glulam beams.

Have a nice evening =)

 

[Tompafix]

Hello.

I hope someone knowledgeable here can assist with the sizing of a glulam beam.
If a drawing is needed, it can be arranged, but I hope my description is sufficient.

Opening of an interior wall, from one gable end and 5400 mm into the house. Thus, I assume a beam of about 5600 mm is required to include supports.

The house is located in snow zone 1.5.

It is a 1.5-story house, with a finished upper floor, insulated roof with concrete roof tiles (built in the early '90s).
The space directly above the intended beam is a bedroom.

The floor joists are 45x170 mm and are connected with roof beams in the attic in a typical 90-degree triangular construction. The floor joists are spaced at cc600 mm, the roof trusses are at cc1200 mm.

The width of the house is 6400 mm.
The distance to the load-bearing wall from the outer wall is 3700 mm, thus 270 mm on the other side. The wall is therefore not centered in the house.
The width of the upper floor, i.e., the room's area is 4200 mm.

Attached is a half-decent example image for better explanation.-

Grateful if someone has the knowledge or program to calculate it. Unfortunately, Svenskt Trä's sizing does not extend beyond 5000 mm glulam beams.

Have a nice evening =)

https://www.byggbeskrivningar.se/dimensionering/oppning-innervagg-1-12-planshus/

 

[Bredare]

[link]

Thanks, but as I wrote in my description, on that page you cannot specify larger lengths/openings than just 5000 mm. Therefore it does not work for me.

 

[Tompafix]

Thanks, but as I wrote in my description, on that page you can't specify lengths/openings larger than 5000 mm. Therefore, it doesn't work for me.

Sry read carelessly 🙃

 

[a_w]

Tricky beam. To get an indication of the size needed, you can use the table available here for glulam beams:
https://www.svenskttra.se/bygg-med-tra/om-limtra/dimensioneringshjalp/
- If you assume a self-weight of the floor structure of about 0.50 kN/m2 (50 kg/m2) and a live load according to standard of 2 kN/m2 (200 kg/m2)
- Assume that out of the 6.4 meters, about 1.25*4.2/2 = 2.7 meters of the load on the floor structure goes directly to the beam
- Then you get a design load of approximately (1.2*0.50+1.5*2)*2.7 = 9.5 kN/m add some snow and other things that come from the roof and floor structure, and you are surely up to 12-15 kN/m.
- From the table, you can read that 78x540 is sufficient for 12 kN/m.
- But considering that this table is based on deflection requirements for roofs (L/300), no reductions from stability issues, and no consideration for vibrations, you should probably increase by some size, maybe to around 2 pcs 78x495.

As mentioned, this is just a rough estimation. Hope you find someone who can help you more thoroughly.

 

[Bredare]

Thanks for the tip. =)