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Using moment directly from FEA for slab design

Using moment directly from FEA for slab design

Using moment directly from FEA for slab design

(OP)
I recently discovered a code equation in CSA A23.3 04 that goes something like this: Mx + |Mxy| which is intended to be used to account for torsion on your moments for two-way slabs. In other words, you can not use the moment that is given by the FEA software without magnifying it for torsional effect. I have never known about this clause until today and a colleague of mine said that the torsional effect on two-way slabs can be significant (raising moment by up to 20%)

I was curious to see if such a clause exists in ACI and if you folks usually take it into consideration when designing two-way slabs.

Thanks,

Clansman

RE: Using moment directly from FEA for slab design

no you can't, unless it gives wood and armour moments. I believe

RE: Using moment directly from FEA for slab design

Clansman - this isn't a code issue - it is simply using the correct moment from an analysis.  The combination of Mx + Mxy and of My + Mxy in each direction is the correct "total" moment to use in determining reinforcement.

 

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