tower crane punching shear
tower crane punching shear
(OP)

I have a tower crane that will be supported on a mat foundation by the anchor above. I am wonder others thoughts on the punching shear check for this. I can see it two ways - assume bearing at the top of the mat slab due to the plate and stiffeners, or bearing at the bottom, 2'-5-5/8" into the concrete. This will obviously make a large difference in how thick I need to make the mat slab. Any thoughts / opinions?






RE: tower crane punching shear
Once this failure plan fails, the assembly still can't go anywhere because of the top plate.
I vote for punching shear checks based on the top plate.
The bottom plate is likely there for uplift resistance, or "negative punching shear"
RE: tower crane punching shear
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
www.americanconcrete.com
RE: tower crane punching shear
If you've got the time to look at this, great. But if you need an answer PDQ, you may be better off contacting the anchor manufacturer.
RE: tower crane punching shear