[RE-wrenches] rebar v/s fiber

[Peter Parrish]

Bob,
 
I may be missing the point here. But if you are doing a pole mount, the
concrete is primarily providing ballast (to counteract the uplift forces of
wind). The sideways forces are counteracted by the diameter and depth of the
hole in the ground (the physical dimensions if you wish) and the compaction
value of the soil; not the weight of the material that fills the hole.
 
I know I am using layman's terms but I think that the jist of what I am
saying is true. 
 
So you don't need rebar to provide weight to counteract uplift forces, but
rebar may be need to keep the concrete mass in one piece.
 
I would be surprised if Array Technologies didn't have structural
engineering reports specifying concrete and rebar needed for their pole
mounts (are you using their product?). Most AsHJ will defer to a stamped
engineering report from the manufacturer as to how to install their product.
 
- Peter
 
 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of bob
Sent: Friday, March 12, 2010 9:52 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] rebar v/s fiber
 
I have to put in a panel mount and am looking for advice as to whether
concrete and rebar is the way to go or my concrete guy is recommending the
fiber mixed into the concrete with no rebar.
 
This will have to be a tall pole mount and I just wanted to pick the
collective experience of the group.
 
Any ideas as to how to go at this?
Thanks,
Bob
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