urgent CMU needs thickened slab?
urgent CMU needs thickened slab?
(OP)
Picture for a moment: a non-load bearing interior CMU wall (8” x 12’ tall with 1 #5 vert. bar at 48” oc) on a 5” concrete slab-on-grade with WWF on 4” of #57 w/vapor barrier.
Is it usual or unusual to have a depressed area (a thickened slab) for this wall? Does the IBC require a thickened slab for this condition?
The #5 dowels have a standard ACI hook. Without a thickened slab area under the wall the hooks of #5 dowels only have a couple on inches of cover as they just hook into the slab. Will this bar be fully developed? Should I be worried or are these some of those so-called “fixing hooks”?
Some on these walls have roll up garage doors (all interior storage rooms) and the EOR has called for 2 #6 bars at each jam. No thickened slab area is called for so these big #6 hooks are just hooked into the slab.
Is it usual or unusual to have a depressed area (a thickened slab) for this wall? Does the IBC require a thickened slab for this condition?
The #5 dowels have a standard ACI hook. Without a thickened slab area under the wall the hooks of #5 dowels only have a couple on inches of cover as they just hook into the slab. Will this bar be fully developed? Should I be worried or are these some of those so-called “fixing hooks”?
Some on these walls have roll up garage doors (all interior storage rooms) and the EOR has called for 2 #6 bars at each jam. No thickened slab area is called for so these big #6 hooks are just hooked into the slab.






RE: urgent CMU needs thickened slab?
RE: urgent CMU needs thickened slab?
I don't know of the IBC requiring a thickened slab, but I do recall it requiring the tops of partition walls of a certain height to be braced in seismic areas.
RE: urgent CMU needs thickened slab?
RE: urgent CMU needs thickened slab?
This is where engineering overlaps into art - you could do a calculation to see if the slab itself would be capable of resisting the shear caused by the self-weight of the wall - but this would be based on a thin floor slab and the position of the WWF is always a big unknown - so your d is varying all over the place.
Most engineers don't sweat this - a thickened slab isn't that expensive to do - just a minor headache for the contractor to dig out prior to placing the VB, WWF and concrete.
RE: urgent CMU needs thickened slab?
RE: urgent CMU needs thickened slab?