Cast in place corbel
Cast in place corbel
(OP)
I came across a continuous corbel detail that is being formed as part of concrete tilt-up wall. I always used ACI detail and requirements for corbels. However, the attached corbel detail is not detailed in the way I like to see them.
In my opinion, the detail may have enough shear capacity through shear friction. However, it may not have the tensile capacity. Additionally, using strut and tie method, the tension and compression zones will almost over lap based on this detail (ideally you want the compression block on the interior zone of the wall while the tensile load as far out towards the exterior face). The code does not explicitly indicate how deep to extend the tension steel. However, ACI pictorially show it as far back towards the exterior face of the wall/column. I also do not think ACI allows for transverse bars to carry tension.
Any thoughts about this detail are welcome?
In my opinion, the detail may have enough shear capacity through shear friction. However, it may not have the tensile capacity. Additionally, using strut and tie method, the tension and compression zones will almost over lap based on this detail (ideally you want the compression block on the interior zone of the wall while the tensile load as far out towards the exterior face). The code does not explicitly indicate how deep to extend the tension steel. However, ACI pictorially show it as far back towards the exterior face of the wall/column. I also do not think ACI allows for transverse bars to carry tension.
Any thoughts about this detail are welcome?
Regards,
Lutfi






RE: Cast in place corbel
Other than battling for a reform of the detail, you may model a composite slice of rebar and steel in 3D, pass it to some FEM package and see what the behaviour is under factored loads.
RE: Cast in place corbel
RE: Cast in place corbel
RE: Cast in place corbel
RE: Cast in place corbel
I believe that the #4 reference lines that look like extended rebar are merely leader lines to the bars, not the actual reinforcing. Right Lutfi?
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Cast in place corbel
RE: Cast in place corbel
RE: Cast in place corbel
RE: Cast in place corbel
I still ca this a cornel, a continuous one. Yes similar to ledger.
Regards,
Lutfi
RE: Cast in place corbel
RE: Cast in place corbel
I typed my earlier response using my I-phone and some of the words got auto corrected. The last sentence should have read: "I still call this a corbel, a continuous one. Yes similar to ledger." Sorry about that.
Regards,
Lutfi