Previous in Forum: Help With This Engineering Question   Next in Forum: Gridline
Close
Close
Close
Member

Join Date: Dec 2010
Posts: 6

One or Two Way Lab

04/15/2011 11:49 AM

Hi everybody in forum.

I am considering the deflection of slab, floor include beams, girders, column and one-way slab ( see the fig.), under the dead and live load, the slab behavior doesn't show as one-way, because the maximum deflection of slab get at beam position.

The slab between the column show the two-way behavior, the affect of beam( between the columns)?maybe neglect the stiffness of this beam? How to compute the deflection of slab in this case, is it one or two way system?

Anyone who can help me, thanks alot!

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
2
Guru

Join Date: Nov 2007
Location: Sherwood Park, Alberta, Canada
Posts: 1212
Good Answers: 73
#1

Re: One or Two Way Lab

04/15/2011 6:25 PM

Slab deflection at:

  • midspan of girder = Δgirder
  • midspan of beam between columns = Δbeam
  • midspan of beam between girders = Δgirder + Δbeam
  • midspan of slab between midspan of beams = Δgirder/2 + Δbeam + Δslab

If you want to include the column compression, add Δcolumn to each of the above.

Looking at the proportions of the slab, it is primarily a one way slab, but it should be reinforced with top bars running perpendicular to the girder for a length of about 1/2 of the slab span (L/4 each side of girder). These are sometimes called anti-crack bars. There should be temperature steel running orthogonal to the main steel in the bottom of the slab.

__________________
Bruce
Register to Reply Good Answer (Score 2)
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Previous in Forum: Help With This Engineering Question   Next in Forum: Gridline

Advertisement