I was planning to remove a couple of load-bearing walls in my house with concrete floors.
I tried the calculation program found at the link below. What I need to support is called "support beam under floor" in the program, and I was surprised at how SMALL the dimension I needed was?! Can any guru check if my calculations are completely off, what do you get? I am attaching a picture of the two walls I want to remove, the walls are about 10 cm wide, and the wish is that the beams are as "low" as possible so as not to block my rooms and approximately 10 cm wide to fit well.
Program: http://www.moelventoreboda.se/index.asp?menuItem=L9
The first is the upper part of the sketch, where the beam should cover an opening that is 3000 mm wide, to the left it is 4000 to the next support and to the right 2750. After 2750, there is reportedly a support up in the attic, hence the measurement at 2750+4500 is irrelevant.
The second opening is 2200 mm, with 3200 to each support on either side. The house is made of concrete, both the floor and the load-bearing walls.
What dimensions do you think I need? If I preferably want to stick to about 10 cm width.
I was aiming to install steel beams in both places, but now I'm wondering if glulam is enough, as it is both manageable and a good economic alternative if you don't need to dimension so tremendously...
I tried the calculation program found at the link below. What I need to support is called "support beam under floor" in the program, and I was surprised at how SMALL the dimension I needed was?! Can any guru check if my calculations are completely off, what do you get? I am attaching a picture of the two walls I want to remove, the walls are about 10 cm wide, and the wish is that the beams are as "low" as possible so as not to block my rooms and approximately 10 cm wide to fit well.
Program: http://www.moelventoreboda.se/index.asp?menuItem=L9
The first is the upper part of the sketch, where the beam should cover an opening that is 3000 mm wide, to the left it is 4000 to the next support and to the right 2750. After 2750, there is reportedly a support up in the attic, hence the measurement at 2750+4500 is irrelevant.
The second opening is 2200 mm, with 3200 to each support on either side. The house is made of concrete, both the floor and the load-bearing walls.
What dimensions do you think I need? If I preferably want to stick to about 10 cm width.
I was aiming to install steel beams in both places, but now I'm wondering if glulam is enough, as it is both manageable and a good economic alternative if you don't need to dimension so tremendously...
You were absolutely right to doubt the result!
I checked the calculation program, and it apparently doesn't take into account that you have a btg-bjälklag. The self-weight for btg is significant!!!
Take your drawings and go to a structural engineer!
With Moelven's calculation, you could end up with the intermediate floor over your head.
According to my simple estimate, you would need a beam with dimensions of about 90 x 350 mm, but then I've guessed how heavy your bjälklag is.
I checked the calculation program, and it apparently doesn't take into account that you have a btg-bjälklag. The self-weight for btg is significant!!!
Take your drawings and go to a structural engineer!
With Moelven's calculation, you could end up with the intermediate floor over your head.
According to my simple estimate, you would need a beam with dimensions of about 90 x 350 mm, but then I've guessed how heavy your bjälklag is.
Okay, it sounds like I made a reasonable assumption then... According to their program, 90x270 should be enough, but those last 8 cm are probably what make it necessary to switch to steel beams. 223 under the beam feels okay, 215 feels too little...
The concrete slab is about 10 cm thick, if that gives you any more clues.
Thanks, by the way
The concrete slab is about 10 cm thick, if that gives you any more clues.
Thanks, by the way