×
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

effect of new oppenings on existing wall + slab

effect of new oppenings on existing wall + slab

effect of new oppenings on existing wall + slab

(OP)
Making new oppenings in existing masonry. Above is RC wall/parapet and a slab.
Do making new oppenings affect parapet (200/1500 mm) in any way?

Because of new oppenings I think that horiz. forces (wind) on the parapet affects existing slab, but not a parapet. Parapet is a cantilever and bending moments at the base of parapet transfer to a slab since parapet is fixed into the slab right?
What Id like to know is does existing design conditions of parapet change because of new openings below a parapet?
Im afraid that becuase of that there may be a need for additional reinforcement (anchors from parapet to a slab).

When it comes to verical loading, parapet now acts as a deep beam, so I dont think there will be a problem since it is 1,5 m high.



RE: effect of new oppenings on existing wall + slab

It depends of the size of the openings, if it is small openings then it will not really affect the parapet, if the openings are relatively big then the parapet will start acting as a upstand beam and should just be checked for bending then.

RE: effect of new oppenings on existing wall + slab

1.5m is quite deep, even if it is nominally reinforced it should be able to span quite a distance.

RE: effect of new oppenings on existing wall + slab

(OP)
Openings are 1 m and 1,7 m wide.

So anchoring reinforcement parapet - slab is not affected by making new oppenings at all ?

RE: effect of new oppenings on existing wall + slab

You'll be asking the slab to hang from the parapet in a way that it wasn't before. The existing detailing may or may not support that. Either way, it's likely fine over such a modest span.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: effect of new oppenings on existing wall + slab

Forget the parapet - probably not a problem.

But do those new wall openings significantly decrease any lateral shear wall behavior of the walls themselves?

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

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