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RE: big dig structural failure - epoxy anchors overhead supporting gravity

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Christopher Wright wrote: " Just out of my own curiosity, does anyone ever
subject these items to cyclic loading or repeated sudden loads?"

ICBO Acceptance Criteria for adhesive anchors includes cyclic testing for
wind or earthquake resistance [see www.icc-es.org/criteria/index ; take a
look at AC58]. 

I wonder about the overhead installation -- freshly placed epoxyie have
fluid consistencies of various viscosities.  Some may be difficult to keep
in place in an overhead hole while the anchor is being placed and during
cure. 

Nels Roselund, SE
South San Gabriel, CA
njineer(--nospam--at)att.net
-----Original Message-----
From: Christopher Wright [mailto:chrisw(--nospam--at)skypoint.com] 
Sent: Sunday, July 16, 2006 8:06 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: big dig structural failure - epoxy anchors overhead supporting
gravity


On Jul 16, 2006, at 12:47 AM, Robert Kazanjy wrote:

> I think SImpson reudces their values depending on hole cleaning 
> method, they even have a value for "no cleaning" but I'm sure there is 
> a huge scatter on those values & I'd be reluctant to use those values.
Just out of my own curiosity, does anyone ever subject these items to 
cyclic loading or repeated sudden loads? I'd expect that repeated loads 
would reduce the capacity over time.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 
1864)
http://www.skypoint.com/~chrisw/


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