×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Precast Wall Opening Reinforcement

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

RE: Precast Wall Opening Reinforcement

I initially would model with your shapes offset to the between axes distances and stud rigid links to intersection of plates, and only if this setup would give me some problems would consider necessary other alternatives. Then if everything looks ok to me, the pull and shear at the rigid links are the forces for the respective studs.

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

iv63,

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.

 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources