Cantilver slab to be poured later
Cantilver slab to be poured later
(OP)
I have a situation ,where as per site requirements, cantilver slab of about 9ft will be poured later in the construction.
Please see the attached sketch and provide your opinion, is it possible to pour as one of the options. I am just wondering that there is no monolithic joint at the junction.
I can ask for bottom rebar to make continuous at support, if it requires to be.
Appreciate for your kind suggestions.
Please see the attached sketch and provide your opinion, is it possible to pour as one of the options. I am just wondering that there is no monolithic joint at the junction.
I can ask for bottom rebar to make continuous at support, if it requires to be.
Appreciate for your kind suggestions.






RE: Cantilver slab to be poured later
RE: Cantilver slab to be poured later
Use a little larger ledge.
Use supplemental bottom dowels to use for shear friction (even though you have a ledge).
Hook the outer wall bar parallel to the wall.
RE: Cantilver slab to be poured later
RE: Cantilver slab to be poured later
could consider increasing of amount of bottom reinforcement.
RE: Cantilver slab to be poured later
There will be some initial downward slip that I think would be more than that found in a monolithic placement.
RE: Cantilver slab to be poured later
I'd also thicken the slab just a bit. ACI says to use a slab thickness of at least L/10 for a cantilever and yours is less than that. I'd round up to 12 inches thick, either on the thicker side or for a constant thickness slab.
RE: Cantilver slab to be poured later
I would also use continuous bottom reinforcement.
RE: Cantilver slab to be poured later
Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that them like it
RE: Cantilver slab to be poured later
1. I would make the top steel continous, and
2. Make sure the bottom steel is also sized for the no cantilever condition too. I would put at least 20 psf construction LL on the backspan too for this condition.
Mike McCann
MMC Engineering
RE: Cantilver slab to be poured later
-Extend bottom bars in form of dowels say by 40xbar diameter min.
- Ensure face is scabbled prior to next pour.
- Cover might be an issue so dont ignore as it drastically reduces your effective depth.
______________________
Aussie brand RAPT is the best for slender rc columns!!
RE: Cantilver slab to be poured later
I agree with Mike that top steel should extend throughout the backspan.
BA
RE: Cantilver slab to be poured later
Thanks for your valued input.
See attached sketch with modifications to suit.
This is a 2 story structure, condition stated repeat at two levels, level one is interior at top with bottom of slab exposed to freezing and other at roof with expososed from top.
RE: Cantilver slab to be poured later
BA
RE: Cantilver slab to be poured later
RE: Cantilver slab to be poured later
________________________________
Use RAPT for Slender RC Columns
RE: Cantilver slab to be poured later
Mike McCann
MMC Engineering
RE: Cantilver slab to be poured later
BA
RE: Cantilver slab to be poured later
RE: Cantilver slab to be poured later
Top rebar arrangement would look like: [] is support cantilver wall.
[]--------------------[]---------
[] -----------[]---------------- []--------------------[]---------
[] -----------[]----------------
hokie,
yes there would be a membrane at roof.
RE: Cantilver slab to be poured later
RE: Cantilver slab to be poured later
- JAE's about cambering and rapt's about corrosion more than agree;
- 50% for me is comforable;
- do not hesitate to provide note about number of days this cantilevered part will be shored, in my opinion it's deflection controlled situation