I am planning to open up a wall for a glass section in the facade of the summer cottage. The opening will be 3200 mm wide (marked in red), and I am considering using an HEA beam supported by posts fixed to the wall at each end. The question is whether it should be 120, 140, or 160...?
The roof trusses are in the direction of the orange lines.
Snow load zone 2.5.
Roof pitch about 40*
The width of the cottage is about 4.3 meters.
It's a cottage located in the archipelago, so wind load might need to be considered?
I used a calculation program for glulam and got 56x270mm if that's of any help? The ceiling is low, so I want the beam to be as short as possible in height. But without it giving way, of course =)
Grateful if someone knowledgeable can give a quick assessment to indicate the size that should suffice.
Yes, roughly. It's an old converted barn with a load-bearing log wall a bit further into the kitchen. So it's a bit patched up and added onto here and there in the attic...
If the two outermost trusses are positioned directly above the beam's support, you only need to consider the point load created by the middle truss. Then, I conclude that glulam 56x270 mm is a correct calculation. If you want to lower the beam's height, you can replace it with 190x180 mm. In steel, HEA 120 is sufficient. Steel is efficient but always more expensive and complicated with regard to mounting, etc.
If the two outermost trusses are directly above the beam's support, you only need to consider the point load created by the middle truss. This leads me to conclude that glulam 56x270 mm is a correct calculation. If you want to reduce the beam's height, you can replace it with 190x180 mm. In steel, HEA 120 is sufficient. Steel is efficient, but always more expensive and complicated regarding fixation etc.
One tends to often overestimate the dimensions when feeling a bit unsure, but the extra kilos a 160 compared to 120 involves are nice to avoid. Thanks for the answer!
Reviving this question because I came across a "free" beam of just the right length (3.20m). It just has a slightly different shape. It's heavy as hell, about 130 kg. The gauge is 12mm thick.
The question is whether I can fillet it and use one half? I understand it's hard to give good advice when so many parameters are unknown. But considering the rest of the cabin is patched with logs here and there, another joint piece should work, I figure... =)
I mostly wanted some support in the theory that with this gauge thickness, I can manage with one angle.
If you follow the attached sketch and let the long lips point downwards with their backs against each other (like a T) - maybe stiffness won't be an issue? I'm thinking of having a 5-10 cm air gap down to the frame for the sliding section, and load-bearing capacity is more important than stiffness, as long as the deflection doesn't become greater than that, of course ;-)
I'm planning to screw together a number of 170x45 beams into posts at each end and then make a cutout in the middle so that the steel beam sits securely and doesn't tip over.
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