How much iron should be in a U-shaped shell (lintel) in the garage?

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I am currently planning my garage. Material: aerated concrete blocks: 24 cm Garage door width: 3.50 m Wall length: 5 m.

Above the garage door will be an open wall 1m long. Behind it is a flat roof. Therefore, the supports for the beams are the two side walls, not the lintel. Now my question is: What iron mesh should be placed in the U-shaped shells? I know this has to be calculated by a structural engineer. But perhaps there is someone here who has already built something like this. No guarantees should be made here. I just wanted to get some experience. It's not going to be a skyscraper. 



The U-shaped shell is a ring anchor. It holds everything together. There are pre-made braided steel mesh baskets for this. That should suffice. Since this is a standard situation, there are also standard irons for it.

  • In this case, the u-shell is just not a ring anchor. I need a lintel for my garage door, which is 2m high. The ring anchor is on two 8m opposite walls. The door is on the 5m side. There are four layers (interior wall height + attic) of aerated concrete blocks above it. Otherwise there is no additional load because the load is on the other walls. Instead of using sheathing, I can take the formwork. 
  • If I understand you correctly, the "ring anchor" is only on two walls. Then it is not a ring anchor. It consists of a ring, as the name implies. The purpose is to give rigidity to the walls so they can't tilt back. I would use a ring anchor (or overlay) as a lintel for a garage door.
  • A net width of 5 meters is quite a lot. If you don't have a structural engineer, close it, make it tall, put a lot of iron in it. 16-gauge rods. Fill it with concrete, and it should hold. But I'm just a layman. And it's an unprofessional explanation with no guarantee of correctness.

This is not a standard situation, although various 3.5m wide gates have been passed, nor are there standard irons for this. Also, the lintel probably serves a different function than supporting the stones stacked above it. If you can't assess this yourself, you should consult a structural engineer

  • This is not a standard situation, it's true. That's why I wanted to exchange experiences with someone who may have already built one. That's it. In the old days, they just put a double T-beam over the opening in the wall and concreted it.
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