Twisting moment in 2ways slab 1

[CHAKKOUR]

hi,
When do we have a flat slab with edge beams or drop panels, how can we take into account the torsion ? We cant use the wood amer analysis because it doesnt apply at the flat slab with beams or drops.
How can i integer the Mxy in the strips ??
Thanks a lot.

 

[rscassar]

You could model the edge beam as a "beam" element and assign a torsional stiffness. For wide narrow beams (beams wider than they are narrow) their may be no need to design for torsion because it is compatibility torsion.

 

[rowingengineer]

I beleive the method you need is the Denton and Burgoyne. se attached. This is a more accurate method to the wood armer equations. commonly used in skew bridges with beams.

An expert is a man who has made all the mistakes which can be made in a very narrow field

 

[rowingengineer]

Just a quick note Mxy is not torsion it is the rate of change of slope in the x-direction as one moves in the y-direction or vise versa. while it inculdes torison moments in slabs, it isn't entirely shear so compatibility donsn't apply, you may wish to read thread507-275796

An expert is a man who has made all the mistakes which can be made in a very narrow field