anchor for steel column post
I am replacing the load bearing wall with a steel beam supported by three 4" steel column posts. There is just one floor of bedroom and bathroom above the beam supports. I dug a little bit of where the steel column posts supposed to stand. It is on the old foundation, looks like some type of cinder block. And the where the posts going to be looks like was filled with cement.
My question is, should rebuild the footing, i.e. dug big holes and fill them with cement, or just drill holes and fill with threaded rod and anchor adhesive?
If I have to dug and rebuild the post footing, how big does it need to be?
If just drill holes, how thick and how long the threaded rod need to be?
Thank you very much.