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RE: Simpson's SET Epoxy Anchor vs. Titen HD Anchor
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Simpson's SET Epoxy Anchor vs. Titen HD Anchor
- From: "Dennis Wish" <dennis.wish(--nospam--at)verizon.net>
- Date: Sun, 30 Jul 2006 18:40:57 -0700
Hilti (and I assume Simpson) indicates a
minimum edge distance from the face of a concrete slab or stem wall to the
centerline of the anchor. Generally this is 2.75” for 2x6 plate which
would give a 5-1/2” diameter cone assumed at the surface of the concrete.
In most cases a wedge or expansion anchor can take the chance and blow out the
side of the concrete. I am not aware of Titen anchors, but here are the
guidelines I would use:
an epoxy anchor for shear bolts and argue the need for deputy inspection
when uplift is not a consideration, the purpose of a shear bolt is to keep
the bolt working parallel to the surface of the concrete until the weakest
material fails which will most likely be the wood plate.
you need tension, the latest Simpson SET catalog allows for greater tension
capacity (limited by the strength of the A307 bolt and increase the
capacity for pull-out based on the diameter and depth of the anchor into the
existing foundation. A cone may be used to evaluate the capacity, but the
chance of blow-out is greatly reduced. Deputy inspection will be required,
but in my opinion, its worth the few hundred dollars.
you need greater capacity then you may want to resort to undermining the
existing foundation when dealing with a slab on grade and design a dead
man foundation below that you can embed a threaded rod with plate washer
and two nuts on each end. One thing to keep in mind is that you don’t
have to over drill the hole if you are installing a dead man foundation,
but you do oversize the hole by 1/8” to allow for epoxy embedded
into the existing slab edge or foundation wall. In this case, you should
use the Simpson BP plate with the four SDS screws to compensate for a
larger whole. The Epoxy fills the hole, but there is no assurance that he
epoxy will fill the enlarged hole in the wood which can cause a dynamic
force against the inside face of the wood hole parallel to grain. The
screwed plate washer will help distribute the anchor force into the
screwed connection through the top of the plate. This is not as critical
if you are using the epoxy anchor for tension only.
am also not a fan of HPAHD strap Holddowns – especially in my area
where the installation generally spalls the concrete on most of them as
the builder saves a few bucks by not using forms to tie the straps in
place. The problem in areas such as mine is that the soil is highly
mineralized and the strap will corrode through within two years losing all
resistance to uplift. I’ve come back in to epoxy coat the exposed
metals but I will not use strap Holddowns in my area (the reason that I
lose a lot of work to those who will give the builder what he wants. (Sorry,
I’m being egotistical).
Rather than discuss this with the Simpson
Rep, call Simpson’s Technical support or ask for their R&D department
in Oakland and
ask for Karen Colonies (sorry about the spelling). She has been tracking these
problems back a few years (if she is even still with Simpson which she probably
is). You can also contact Steve Pryor at the Dublin Office who is an SE and who
is also very well informed on the testing and problems they face with some of
their epoxy and strap connections. In my experience, not to speak badly
of the Rep’s, but I consider them more as sales people to help with
customer care in the field and while some may be professional engineers, I find
that they are limited to the amount knowledge hey have when it comes time to
testing in research and development of products.
From: Robert Kazanjy
Sent: Saturday, July 29, 2006
Subject: Re: Simpsons SET Epoxy
Anchor vs Titen HD Anchor
On 7/29/06, Brian
I will contact my Simpson's rep again and ask him that
question. When I contacted them the first time, they
really weren't that much help. All the rep could do
is reiterate the exact same information that was shown
in their load catalog.
I could be mistaken, but I was under the impression
that expansion anchors were not recommended in seismic
conditions. Is that correct? If so, where could I
find that information? I was wondering if this same
condition might hold true for the Titen HD anchors.
--- Jim Getaz <jgetaz(--nospam--at)shockeyprecast.com>
The last time I looked at
> Simpson's Titen bolts,
> Simpson said they were not to be used for more than
> about 30 days
> outdoors. I have called for Powers Wedge-Bolts