Concrete Pier min. reinforcement for PEMB columns
Concrete Pier min. reinforcement for PEMB columns
(OP)
I am working on designing 2'-0" x 2'-0" x 2'-0" concrete piers which will transfer load from a PEMB to mat foundations. I am using ACI 318-11. Do I need to follow 10.9.1 "Limits for reinforcement of compression members" which requires As= 0.01Ag-0.08Ag? When I calculate 1% of my area, I find that I need 5.76 sq.in (8 #8's have As=6.32 sq.in) of longitudinal reinforcement. To me, (8)#8 bar seems excessive.
What are your thoughts?
Thanks
What are your thoughts?
Thanks






RE: Concrete Pier min. reinforcement for PEMB columns
It's really not that much bar, but it will look funny. And don't forget, that the bars need to be developed, so that might be tough with #8's.
I'd be much more worried about anchoring the PEMB to the pier. Whatever you assume, they'll increase the loads and decrease the anchor spacing.
RE: Concrete Pier min. reinforcement for PEMB columns
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Concrete Pier min. reinforcement for PEMB columns
RE: Concrete Pier min. reinforcement for PEMB columns
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Be sure you address the transfer of anchor rod tension into the vertical reinforcing in the pedestal. Since your pedestal is so short, you may want to use a smaller vertical bar size (and more of them), in order to develop the proper strength for load transfer.
RE: Concrete Pier min. reinforcement for PEMB columns