A door opening (8'x4') at an existing tilt up concrete wall panel
A door opening (8'x4') at an existing tilt up concrete wall panel
(OP)
We are going to cut a door opening (8'x4') at a tilt up concrete wall panel. the wall is about 7" thick and 32 feet tall (footing to roof), it is reinforced with #4@10" OC.
the wall support vertical load from roof and also act as shear wall (resist as in-plane shear)
I am thinking of attach steel plates to the concrete above the opening as header
any suggestions how to framing the openings?
Thank you.
the wall support vertical load from roof and also act as shear wall (resist as in-plane shear)
I am thinking of attach steel plates to the concrete above the opening as header
any suggestions how to framing the openings?
Thank you.





RE: A door opening (8'x4') at an existing tilt up concrete wall panel
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
I did a lot of tiltwall in my previous job and I never had shear as an issue.. usually wind at the parapets would control..
On a side note, I'm willing to bet the thickness of the wall is 7.25 in. Remember that tiltwall is framed with sawn lumber sizes, so unless they used (2) 2x4's (highly unlikely), it almost certainly was framed with a 2x8.
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
the opening is about 4'wide, and 8' tall (it is a door)
the door is at the bottom of panel, about 9' from the edge (1/3 of 28')
by the way, the wall has no parapet.
frv, you may be right, I scaled the thickness from the drawing
the wall may be 7.25"
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
If the steel spans horizontally instead of vertically, the same woulod be true of the header steel.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
Here is a thread I wrote a while back:
thread507-251820: Cutting Openings in Precast Wall Panels
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
in this job, the original panel was designed in 1988.
we put some door openings at previously designed knockout panels and some are not. A 6'-8"x12"x5/8" steel plate above the 4' width door opening as a header. the plate is anchored to concrete.
Now the reviewer (we submit for permit) wants us show the calculations to prove the in-plane and out-plane capacity of the panel with opening(even the opening is in previously designed knockout panels). we do not want to spend too much time on this. Any suggestions? Thank you.
RE: A door opening (8'x4') at an existing tilt up concrete wall panel
Just run the calcs and show that the jamb steel is adequate.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask