"Another reason pilasters are built is to support a beam above. In the first video that is what the guy is building "
Yes I included the wrong video but I have seen another one of his where he is specifically repairing a CMU wall using that method. And I have also found a few web sites that show how to build such a structure to repair a wall (not hold a beam).
"The second video IMO has some merit "
Yes it seems that way to me too, but I don't have any structual engineering knowledge, so I don;t know.
"The third guy is quite similar to the second video '
Yes but I have done a fair amount of framing and working with wood and I am waaaayyyy more comforable working with wood than metal but I see the merits of both (I just don't know what loads that can material each carry ).
"Your big problem is you have nothing above except the corrugated metal the concrete floor above was poured on. "
Agreed. This is the BIG problem with doing any inside fix. BUT I think it is doable. The rim joist on the house is slightly set back in on the house block wall so there is an actual ledge created that could help support the beam coming off that rim. Also the floor joists on the house are running the same direction that these joists (beams) would be run so the new beams (joists) would butt into the existing joists so I think that would be what I would want.
"you would have to figure out if anchoring the bottom into the floor would be enough or if you need to go down with deeper footings. "
Agreed that is why I need to hire a structual engineer. I have an acquaintence who is a structual engineer. Up until this scamdemic hit I was working with a guy who has a handyman, home improvement company and he and I were gutting and renovating a 80 year old mill house for this engineer. When the scandemic hit, my friend (the handy man business owner) decided he wanted to keep all his work for himself so he "let me go". Anyhow, I have a call in to the engineer acquaintence and I hope he can fit me into his busy schedule.
"It would still be a big job to take on. "
Agreed, but I have all the time in the world and little money so..... this is the kind of solution I need, something that I can AT LEAST put some sweat equity into to reduce the price or hire a helper to help me do the whole job.
thanks for your input.