waffle slab analysis
waffle slab analysis
(OP)
hi friends
i had designed simply supported waffle slab using ACI-318-2008
its dimensions 11.8 x 12.5 M , i chose 450mm depth and 150mm rib width, with 500mm spacing,DL=3KN/m2,LL=2KN/m2.
its depth is more than required by Code, but when i checked deflection ,it was unsafe ,it gives 100mm (short-term & long-term)
i used alpha & beta of grashoff
what is the problem ????
i had designed simply supported waffle slab using ACI-318-2008
its dimensions 11.8 x 12.5 M , i chose 450mm depth and 150mm rib width, with 500mm spacing,DL=3KN/m2,LL=2KN/m2.
its depth is more than required by Code, but when i checked deflection ,it was unsafe ,it gives 100mm (short-term & long-term)
i used alpha & beta of grashoff
what is the problem ????






RE: waffle slab analysis
RE: waffle slab analysis
RE: waffle slab analysis
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: waffle slab analysis
this waffle is a panel n R.C. foor ,simply supported by Beams around its 4 sides
just today i found out that i used wrong method (grashoff)
which gives unreasonable deflection.
it is mentioned in ACI 435R-95 to use Timoshinko Method
for two-way Slabs.
paddingtongreen , in my case the loads is normal and not that much as urs
if u checked ACI-318, u can notice that the depth which let u avoid deflection calc. is L/33 =12500/33=378Mmm
so 400 is safe depth, but im more conservative to use 450mm
bottom bars 4 diam. 16mm