Hello everyone!
Today I have a garage with walls made of concrete blocks, a cast concrete vault roof (about 15cm thick), and above this, there are W-trusses with rough sheathing and metal cladding.
Currently, there are two swing doors measuring 2800x2600 with a central pillar that measures 520mm in width. The internal ceiling height is 3010.
I have ordered an overhead door from Krokom measuring 5000x2610.
The plan is to:
1. Prop up the opening, knock down the pillar and cut away the upper "concrete beam"
2. Build up a lecavägg that is about 80cm wide on each side, reinforced with rebar welded into the old steel frame.
3. Measure and plaster everything so that everything is straight and aligned
4. Lift up a glulam beam that will be covered with exterior gypsum, chicken wire, and plaster on the outside.
A friend who is an engineer calculated a bit and said that the concrete vault itself is likely almost self-supporting (depending on how well-reinforced it is), and said that a 115x315 glulam beam is sufficient as a lintel.
I ran it in some simulations, and got around 50% usage and 20mm deformation if I have a 140x405 glulam beam.
I think I have room for MAX 400 mm beam.
I attach a picture so you can roughly see what I have in mind:
Blue: Glulam
Red: Lecaväggar
Orange: 45x120 studs to have something to more easily fasten the door tracks to.
Please feel free to share your thoughts or specific suggestions.
Best regards, Jocke
Today I have a garage with walls made of concrete blocks, a cast concrete vault roof (about 15cm thick), and above this, there are W-trusses with rough sheathing and metal cladding.
Currently, there are two swing doors measuring 2800x2600 with a central pillar that measures 520mm in width. The internal ceiling height is 3010.
I have ordered an overhead door from Krokom measuring 5000x2610.
The plan is to:
1. Prop up the opening, knock down the pillar and cut away the upper "concrete beam"
2. Build up a lecavägg that is about 80cm wide on each side, reinforced with rebar welded into the old steel frame.
3. Measure and plaster everything so that everything is straight and aligned
4. Lift up a glulam beam that will be covered with exterior gypsum, chicken wire, and plaster on the outside.
A friend who is an engineer calculated a bit and said that the concrete vault itself is likely almost self-supporting (depending on how well-reinforced it is), and said that a 115x315 glulam beam is sufficient as a lintel.
I ran it in some simulations, and got around 50% usage and 20mm deformation if I have a 140x405 glulam beam.
I think I have room for MAX 400 mm beam.
I attach a picture so you can roughly see what I have in mind:
Blue: Glulam
Red: Lecaväggar
Orange: 45x120 studs to have something to more easily fasten the door tracks to.
Please feel free to share your thoughts or specific suggestions.
Best regards, Jocke
I have no direct comments other than I think you should listen to your friend who is a designer regarding the dimension of the beam. I would also consider a steel beam instead of wood. I think your 20mm is also too much. A deflection larger than L/300 starts to become visible to the eye, and larger deflections over openings can cause issues when the beam starts pressing on frames and similar elements.
So you think I should do as he said, even though a thicker glulam beam bends 20mm?B bossespecial said:
I would prefer to avoid steel as it becomes much more complicated to cover, but sure, with a steel beam I could reduce the dimensions quite a bit.
Now I don't know how you calculated it or what assumptions or loads you used. But as an engineer, one hopefully has a bit more understanding of the workings of constructions and can "credit" oneself a bit more. However, I might agree that the small beam wouldn't actually add so much. I also had the same attitude towards steel before I really needed a steel beam at home, it was surprisingly "easy" to work with the steel and no problems to encase it