Precast Wall Opening Reinforcement
Precast Wall Opening Reinforcement
(OP)
There is an existing precast wall panel 10in thick, 28ft long and 40ft tall. Architect wants to cut 22ft(L)x10ft(H) opening (3ft from each end) and this opening needs to be reinforced. I am leaning toward attaching wide flange "H" frame to interior side of wall (please see attachment). How would you design/treat/model this reinforcement? As composite section? Any suggestion would be appreciated.
IV
IV






RE: Precast Wall Opening Reinforcement
Respect construction, I would add epoxy behind the shapes to be pressed by the bolts. Continuity always helps. Respect the header at the door, I would make maybe box section with projections for the bolts, i.e., the side besides the wall panel would be bigger to place the bolts.
An not forget to shore whilst, one never knows.
RE: Precast Wall Opening Reinforcement
There was a recent post on this same scenario where I gave some pretty comprehensive information. I suggest you use the google tab at the top of the page to find it.
From the size of the panel I would expect that this is a tilt up rather than a precast panel.
As far as your design questions are concerned, your models shows that you are definately thinking in the right direction. I would definately not try and get this to work compositely though as it is a lot of work to get it done and the corners of the new opening will definately crack without trimmer bars.
I generally assume that the panel legs support the self weight of the panel and that the structural steel takes all the lateral wind/earthquake loads.
Check that this panel is not required for overall lateral stability of the building(i.e. shear wall) as it will need to be looked at in more detail.
RE: Precast Wall Opening Reinforcement