×
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

Steel-Concrete-Steel Landing Slab

Steel-Concrete-Steel Landing Slab

Steel-Concrete-Steel Landing Slab

(OP)
I have a 2-1/2" concrete slab that spans between fin plates at a stair landing. The fin to fin spacing is 21". There are #6 reinforcing steel bars that spans between the fin plates and are welded to the fins with a 1/4" fillet weld all around. The reinforcing steel bars are located mid-depth of the slab.

What is the correct way to transfer the shear from the 2-1/2" concrete slab to the steel fin plates. The slab can span based on plain concrete shear and flexure. I am just not real sure how the slab transfers the shear to the fin plate.

Thanks,
Val  

RE: Steel-Concrete-Steel Landing Slab

If supported in the fins, one first would look at Vc capacity without shear reinforcement. If not enough, enter dowel action. A 3D model will help to establish if the deformations are small enough for the thing working properly; even so maybe one can expect some visible crack.

This is the proble with uncommon designs, one can't be as sure of good behaviour by lack of testing enough. And some designers are not just looking for novelty but irrationality. Even if we must not repress all times these intents, for that would stifle innovation, the designer should always know that some things are made along some precise ways for some reasons.

RE: Steel-Concrete-Steel Landing Slab

(OP)
ishvaaag,

The way the landing is constructed is that the rebar is welded to the fins and then the concrete slab is placed. A cross section of the landing is as follows:


     -                                  -
    | |                                | |
    | |                                | |
    | |                                | |
    | |--------------------------------| |
    | |________________________________| |
    | |                                | |
     - -------------------------------- -

The horizontal dotted lines = Edge of concrete
The horizontal cont. lines = rebar

The remaining thickness of the fins is filled in with a finished topping slab. Also, the slab is placed with formwork on the bottom and sides.

Val

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