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Good points - it does not even look right in real life! everything looks much too open and top heavy.
I created the arch as a feature more than a structure, I know that arches are very capable, but only when the supporting structures are up to the job.
I have already filled the hollow cores in with concrete and 12mm rebar and intend to build a slab over the top of the arc which will have 4 x 12mm rebars that will have their ends bent at 90 degrees and pushed down into the tops of the hollow cores. The slab will be almost 8 inches thick at the sides and cover the apex of the arch with about 1 inch of concrete.
Do you think that I also need to use steel rods, plates and washers also?
If either DMUN or CanuckJim do not respond shoot an email to them and have them look at this thread. I don't think we have any Civil Engineers on this board... yet. From what is shown the thrust lines are way outside of the wall and that is cause concern. Have you thought of incorporating a buttress? It would require some foundation digging and more blocks but you may be able to incorporate the buttresses as walls for a workspace counter or enclosed cabinets or book ends to keep the wood pile tidy.
Look closely to the previous link. One way to stabilize the arch is to apply a heavy load to the arch. You may be doing this by adding in the concrete. Also shen you build your dome it will it be be toward the outer edges and the weight vectors will be near the outer walls.
The oven will be a mix of Example 1 Remedy 2 and Example 2 Remedy 1.
You may just need a heavy ring, which could be tied and buried at the base of the walls
If your side supports are masonry filled, you should have more than enough support for your slab, if it's reinforced in the usual manner. Remember: most of us just pour slabs with temporary forms or wonderboard underneath, not your elegant arch.
Ed, that oven was my original inspiration, although I lost the thread a while ago and could not remember where I had seen it.
Jim + Dmun,
I have filled the cores with cement and 2 lengths of rebar on each side and expect to place a substantial amount of concrete over the arc, the larger part of which will be concentrated over the tops of the walls.
Before I start the next stage I want to be sure that this approach is going to be ok, and the thing is not goint to fall down on me!
Like most of the builders here I am fitting this around lots of other things. Tommorow I am riding in the London - Brighton bike race , having done no training. Hopefully I will be able to get the reinforcement in place and secure the blocks and bricks with a small amount of cement after the race - if that is going to be enough to shift the loading directly on top of the walls.