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Re: Re: Expansion Anchors in Masonry

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Some expansion anchors have slipped right out of their holes in past
earthquakes. Paying attention to proper installation procedures is one aspect
of the problem, but there are other aspects to some expansion anchor designs
that warrant testing. ATC and SEAOSC have recommended two somewhat different
cyclic testing protocols, but still very different protocols may be needed to
address long, large pulses in near source shaking. Suffice to say that there
is not a uniform standard yet for cyclic test protocols. I am glad to see
ICBO adopt a go slow approach on approving building systems such as these
which appear to be quite sensitive to cyclic loading. They have learned their
lessons from the Northridge Earthquake. 
Fred Turner
Staff Structural Engineer
Ca. Seismic Safety Commission
1900 K St. #100 Sacramento, CA 95814
916-327-1606 916-322-9476 Fax
FredT5(--nospam--at)aol.com