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Precast tension stresses
- To: "Structural Engineering Association International" <seaint(--nospam--at)seaint.org>
- Subject: Precast tension stresses
- From: "Jake Watson" <jake_watson(--nospam--at)comcast.net>
- Date: Fri, 24 Oct 2003 08:34:31 -0600
We are working on a
precast concrete project. One of the pieces is a planter box. It
will be suspended and vines will grow from it. Our contract documents call
for prestress and for a design that will not have any tension in the
concrete. The precaster missed the note and only has mild reinforcing in
his bid. It would be relatively easy to simply make them match the
contract documents, but we would like to offer them a performance spec that
could potentially be met with mild reinforcing. Our goal is to prevent
concrete cracking and potentially having a leak problem.
For those of you that
design concrete water tanks, how do you insure they don't leak? What
should we use for a maximum allowable tension stress in the concrete?
IIRC, according ACI concrete cracks at 5 square roots. We need to be
sure there won't be problems long term. Should we spec a different
limit? Of is there another method than simply specifying a limiting
Thanks in advance for
Jake Watson, P.E.
Salt Lake City, Utah