Effect of Cantilever slab!!!
Effect of Cantilever slab!!!
(OP)
I am performing an analysis of a building which has cantilever slabs.. when i remove the cantilever slab I get quite reasonable reinforcement area. but with the canti slab the required reinforcement area increases. Is it normal to increase the reinforcement or are there any techniques regarding loading to cantilever slabs
canti of almost 3 ft ( 1m)
canti of almost 3 ft ( 1m)






RE: Effect of Cantilever slab!!!
Dik
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
Dik
RE: Effect of Cantilever slab!!!
That logic escapes me. With the same span, adding a cantilever will always relieve load in the span, so the bottom reinforcement would not increase. I didn't take the OP's question to be about patterned loading, but rather about the effect of a cantilever.
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
A sketch attached to your post would also be of help.
RE: Effect of Cantilever slab!!!
I'm also surprised that the column is being so adversely affected by a 3' cantilever. Sometimes, I intentionally introduce a cantilever to help out with punching shear and/or the design of the adjacent slab and column.
Could it be that, in switching your case from no cantilever to cantilever that you're also changing the boundary condition of your columns from pinned to fixed?
Assuming that your column design is blowing up because of excess moment, one technique that many designers use is to reduce the effective moment of inertia of the perimeter columns such that they attract less moment. I don't remember the magnitude of the modifier but the justification is that, since columns have a relatively low P/M ratio, it makes sense to assume that their moment of inertia is a good deal less than Igross.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Effect of Cantilever slab!!!
Dik
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
JAE, I will post the sketch!!
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
that canti part.. is there any idea about loading
I assigned area load to canti slab as
Uniform to frame(shell) . 2 kN/m(^2) two way
finish load : 0.75 kN/m^2 two way
and i did not mesh the cantilever slabs
RE: Effect of Cantilever slab!!!
that canti part.. is there any idea about loading
I assigned area load to canti slab as
Uniform to frame(shell) . 2 kN/m(^2) two way
finish load : 0.75 kN/m^2 two way
and i did not mesh the cantilever slabs
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
RE: Effect of Cantilever slab!!!
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Effect of Cantilever slab!!!
What if I just ignore the cantilever part? :P
RE: Effect of Cantilever slab!!!
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Effect of Cantilever slab!!!
I am a BE graduate .. and has lot more to study and find out the solutions.. Thanks for your help