I am going to open up the load-bearing wall between two rooms. Upstairs there are some bedrooms. The house looks approximately like the picture where the floor structure rests on this load-bearing wall.
I plan to open up about 3.70 meters and was thinking of placing a glulam beam there instead, 90 mm wide. Anyone dare to make a rough estimate of how high it should be?
Personally, I don't think it has to be that exact. I'll simply check what's in stock, maybe 90 x 300 mm, and go with that
Assuming the wall is only loaded by the overhead floor slab (no columns or roof being supported, etc.), I would suggest 90x315 class GL30c, assuming 30 kg/m2 for the floor slab and 200 kg/m2 for live load. However, columns and a foundation that can handle the point loads of about 2.6 tons may be needed - have you checked/thought about that?
Assuming the wall is only loaded by the overlying floor structure (no columns or roof being supported, etc.), I would suggest 90x315 class GL30c, assuming 30 kg/m2 for the floor structure and 200 kg/m2 for useful load. However, you might need columns and a foundation that can handle point loads of about 2.6 tons - have you checked/considered this?
Thank you. I had a feeling to go with 90 x 360, which Moelvens' simple design program also suggested, with a deflection of 6 mm. Since their program is very simple, I believe they have some margin in the system. But a height of 315 or 360 seems to be good.
The point loads in the posts must of course also be considered, but I am quite sure there is a load-bearing cast wall underneath, so it should be fine.
Sounds good! The deflection will of course be slightly larger with 90x315 than x360. With my assumptions, it's at 10 and 7 mm (long term), for a 3.8 m long beam.
Sounds good! The deflection will of course be a bit larger with 90x315 than x360. With my assumptions, it's at 10 vs. 7 mm (long-term), for a 3.8 m long beam.
Do you know what the approved values for deflection are?
Deflection is often based on function (e.g., something supporting glass cannot flex too much, as the glass might break) and aesthetics (you shouldn't notice that the beam deflects "too much" even if the beam holds for it), with few strict requirements in standards but there are recommendations, e.g., from Träguiden.
Deflection is usually based on function (e.g., anything supporting glass cannot bend too much, or the glass might break) and aesthetics (you shouldn't notice the beam deflecting "too much" even if it can handle it), few strict standards but recommendations can be found at Träguiden.
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L/300 is usually fine unless it concerns very long beams, in which case it's appropriate to set an absolute value of perhaps 20-30 mm.
I based on L/300 (~12 mm) when I chose 90x315.
Yes, big difference if it's a bathroom with tiles on top or just regular rooms with parquet flooring, of course.
Since a 360-beam deflects 6 mm according to the calculation, it's about half of the maximum value. So I possibly could have reduced the dimension a bit, but it's already ordered, and the clearance height underneath will be sufficient.
Haven't checked it since the beam is the same (and unknown, at least in the thread) and "only" the support is changing. Worried that the beam might start vibrating?
The beam's (90x360) natural frequency with assumed dead weight of the beam is 38 Hz, if I punched it in correctly on the phone's calculator
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