Force on Slab End?
Force on Slab End?
(OP)
Lets say I have a slab cantilevering 16" from the C.L. of a steel beam. The architect wants to support brick cladding a further 12" beyond the end of the slab, by use of 6"x6" HSS vertical tube hangers + 4"x4" HSS spacers welded to the hangers + a 4"x4" contin. shelf angle, supporting the brick.
The moment from the 12" eccentricity is taken into the floor system thru a couple formed by a weld plate on the face of the slab (where the 6"x6" tube hangers are welded) and an HSS horiz. strut running to the bottom of the steel support beam (between the 6"x6" vert tube + the steel beam).
If there is a tributary 3.6 kip vertical load acting down at the shelf angle location (per each 6"x6" hanger), then for the design of the slab end would I use the same 3.6 kip load placed at the tip, or would I need to magnify the load on the slab end up by 3.6*(16"+12")/16"? Not sure if I explained very well - maybe I should add a sketch?
The moment from the 12" eccentricity is taken into the floor system thru a couple formed by a weld plate on the face of the slab (where the 6"x6" tube hangers are welded) and an HSS horiz. strut running to the bottom of the steel support beam (between the 6"x6" vert tube + the steel beam).
If there is a tributary 3.6 kip vertical load acting down at the shelf angle location (per each 6"x6" hanger), then for the design of the slab end would I use the same 3.6 kip load placed at the tip, or would I need to magnify the load on the slab end up by 3.6*(16"+12")/16"? Not sure if I explained very well - maybe I should add a sketch?






RE: Force on Slab End?
RE: Force on Slab End?
RE: Force on Slab End?
RE: Force on Slab End?
FWIW: Hit this problem a lot as brick cladding (supported off the edge of a floor slab) is a popular architectural look in my part of the world. Typically use TS6x2 tubes as the hangers at 4'-0" o.c with 6" light gage studs between. Your case may be different, but usually there is not much need to go a TS6x6. The width doesn't do much. Have seen other engineers us a C6 in these cases, but loading the hanger off of its shear center bothers me just a little bit.
RE: Force on Slab End?
DaveAtkins
RE: Force on Slab End?
1. a shear and a moment
or
2. an amplified shear reaction
not both.
I would believe that 1. is more applicable in this case.
csd
RE: Force on Slab End?