×
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 Concrete Balstrade subject to Crowd Loading

Precast Concrete Balstrade subject to Crowd Loading

Precast Concrete Balstrade subject to Crowd Loading

(OP)
Hi guys,

I have a balustrade for a stair subject to crowd loading that was initially insitu concrete however, the QS has decided it will be easier to build if it was precast. Personally I don't think this will work because it will be unable to transfer moment into the slab.

Has any had a detail similar to this that has worked? Likewise does anyone have advice on what the best construction solution would be for this situation?

RE: Precast Concrete Balstrade subject to Crowd Loading

Cast the balusrade with cogged reinforcement bars hanging out of the bottom edge.
Prop the precast balustrade off the block wall, with suitable lateral restraint.
Cast the slab underneath it.

RE: Precast Concrete Balstrade subject to Crowd Loading

As long as the ballustrade is anchored at the top ends, it doesn't need to transfer moment to the slab.  (assuming you have reasonably spaced columns.  

Just load tested one a few weeks ago. I'll look up the results and let you know.

RE: Precast Concrete Balstrade subject to Crowd Loading

Oh, come on, asixth.  This is the balustrade we have been hashing over in your other thread.  Don't spoil it all by taking a quantity surveyor's advice on something he knows nothing about.  It has to be cast in place.  Well, not has to, but precast for your particular stair balustrade is silly.     

RE: Precast Concrete Balstrade subject to Crowd Loading

(OP)
I only have a 4.5" brick vaneer that needs to be supported of the balustrade. The only load path I have is a cantilever. Is there anyway of achieving a moment connection with this detail.

RE: Precast Concrete Balstrade subject to Crowd Loading

The precast balustrade could be cast with rebar coming out of the SIDE at the bottom, along with a corbel like ledge to support the slab.

See attached sketch.  There would also need to be some rebar for the balustrade to wall connection.  Still some bugs to work out but it could be done.  Also, some tweaking of the proportions of the ledge, rebar layout, etc. would be needed - this is just a quick idea really.

Now whether it is more economical and a better choice, I'll leave that to you.  

 

RE: Precast Concrete Balstrade subject to Crowd Loading

You could use weld plates anchored to the slab and flush with the top of slab.  They could be spaced at, say 4' centers.  The precast balustrade would have matching weld plates, then you field weld them together.

The architect may wish to add a strip along the bottom to hide the weld plates from view.

BA

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