Torsional Rigidity of a Metal Deck
Torsional Rigidity of a Metal Deck
(OP)
Does the behavior of a deck (whether it is flexible or rigid) make a difference on whether or not a deck can transfer torsion? (or possess torsional rigidity) or are they independent concepts?
I am working on gas station where the canopy is L shaped and is attached to the store. The store is braced with x-bracing and the canopy has cantilever columns. Because the store is more rigid than the canopy, I see the building taking all the lateral load. However, the center of mass is ways from the center of rigidity and I have significant eccentricity. I am curious if an L-shaped metal deck will be able to transfer full torsion into my store.
I am working on gas station where the canopy is L shaped and is attached to the store. The store is braced with x-bracing and the canopy has cantilever columns. Because the store is more rigid than the canopy, I see the building taking all the lateral load. However, the center of mass is ways from the center of rigidity and I have significant eccentricity. I am curious if an L-shaped metal deck will be able to transfer full torsion into my store.
Clansman
If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.






RE: Torsional Rigidity of a Metal Deck
BA
RE: Torsional Rigidity of a Metal Deck
Please see attached sketch.
Clansman
If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.
RE: Torsional Rigidity of a Metal Deck
BA
RE: Torsional Rigidity of a Metal Deck
As for torsion in the deck...not usually a consideration. Biggest controlling element is moment in the columns.
RE: Torsional Rigidity of a Metal Deck
Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it
RE: Torsional Rigidity of a Metal Deck
Clansman
If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.
RE: Torsional Rigidity of a Metal Deck
RE: Torsional Rigidity of a Metal Deck
I usually design metal deck as a flexible diaphram that doesn't transmit torsion, but I think the definition of a rigid diaphragm is based on diaphragm deflection. If your story deflection is really small, you could consider the deck as rigid.