Garage construction - How much iron is needed in the U-shaped shell (lintel)

Hello,
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 there will be a 1 m high facing wall. Behind it a flat roof. The support for the beams are therefore the two side walls and not the lintel. Now my question: What kind of iron mesh is needed in the U-channels? I know that a structural engineer must calculate that. But maybe there is someone here who has built something like this before. No guarantee is given here. Just wanted some practical experience. After all, it’s not a high-rise building. Thank you very much!

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

Hello Vicky Pedia,
thank you for the reply. In this case, the U-shell is simply not the ring beam. I need a lintel for my garage door. It is at 2m height. The ring beam is located on the two opposing walls that are 8m long. The door is on the 5m side. Above it come four layers (wall interior height + parapet) of aerated concrete blocks. Otherwise no further load, since the load is on the other walls. OK. Instead of U-shells, one can/should use formwork. That is what it’s about. Someone must have had experience with something like this. It is only an information exchange, and no guarantee for anything.
Thank you.

Hello leisure mason

If I understand you correctly, the "ring beam" rests only on two walls. Then it is not a ring beam. As the name suggests, it consists of a ring. The purpose is to stiffen the walls so that they cannot tilt away. Appropriately, I would design the ring beam (or cover) right away as a lintel for the garage door.
5 meters clear width is quite substantial. If you don't have a structural engineer, get one involved, build it properly high, put plenty of rebar in. Use 16 mm rods. Pour concrete in and that should hold.
But I am only an amateur. And this is an amateurish explanation without any guarantee of correctness.

Steven

Hi

It is neither a standard situation, even though various 3.5m gate widths have already been spanned, nor is there standard iron for it.
Also, the lintel probably has another function besides carrying the stones stacked above it.
If you, as a hobby mason, cannot assess this yourself, you should ask a structural engineer.

Olli

Hello, the thing with the ring beam was a mistake. O.K. Learned something. It is not a standard situation, that's true. That's why I wanted to exchange experience with someone who may have already built it. Nothing more. In the past, people simply laid a double T beam over the wall opening and poured concrete. That has stood for 40 years. Today everyone just wants to make money. I have nothing against that either. But the churches should be left in the village. Some structural engineers simply charge way too much. I am talking about a garage construction here and not a residential building. Many thanks for your answers.