I have 2 openings that the architect wants to cut into some existing cast-in-place concrete walls that are supporting a precast plank roof. I am considering possible reinforcing by externally bonding some steel plates at the bottom of the opening. I know that epoxy bonding carbon fiber is another way to do it, but I only have 2 openings and don't want to get specialty engineers or contractors involved.
The problem is, I am unsure of the way to design this. My thought is to conservatively use an allowable stress approach to check the stress in the steel, considering the modular ratio and calculating "j" and "k". I would then "bond" the steel to the concrete using drilled-in adhesive anchors. I consider this as a conservative but quick and dirty approach as a possible alternative to sizing a steel beam to span the opening.
The problem is, I am unsure of the way to design this. My thought is to conservatively use an allowable stress approach to check the stress in the steel, considering the modular ratio and calculating "j" and "k". I would then "bond" the steel to the concrete using drilled-in adhesive anchors. I consider this as a conservative but quick and dirty approach as a possible alternative to sizing a steel beam to span the opening.
