I need help regarding beam supported composite slab.
I need help regarding beam supported composite slab.
(OP)
According AISC manual 14th edition it is not recommended to use Y2>7. So AISC recommendation not to use more than W16x45 for the depth of 16'' beam & there is no value given for size more than W16x45 in table 3-19. But RISA floor and Enercalc is giving sizes more than W16X45. For Architect requirement I can not use beam size more than 16". So Which recommendation should I use and why?
Thanks
Thanks






RE: I need help regarding beam supported composite slab.
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: I need help regarding beam supported composite slab.
RE: I need help regarding beam supported composite slab.
The location "7" is the point where ΣQn = 0.25FyAs. This is a very low PNA position and represents a composite beam with 25% composite behavior which has historically been the lower bound limit of composite shapes.
In other words, below 25% you are not adequately engaging the concrete - you would get substantial slip between the steel and concrete and this could significantly affect your overall stiffness of the slab-beam.
Read the commentary in the AISC specification (section I3.2 - page 16.1-355 and through 356). They outline some of the concerns of using lower composite action.
Hope this helps!
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: I need help regarding beam supported composite slab.
If you are limited to 16" then heavier W16's could be used. The table nor the spec prohibits that from what I can see.
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies