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Concrete Anchors

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Manufacturers' published values for post-installed concrete anchors are
based upon testing in so called uncracked concrete. Concrete anchors
installed in areas of higher concrete stress (cracked concrete) may have
reduced capacity. ACI 355 has a detailed description of this research and
testing. California hospital codes already impose capacity reductions for
anchors installed in tension zones. Early results from a proposed cyclical
load test method for anchors from an ad-hoc committee of structural
engineers from SEAOSC also suggest capacity reductions may be appropriate.

I am not aware of past industry wide poor performance of properly designed
and constructed post-installed concrete anchors that used current values.
Is there a need to re-test all types of post-installed anchors to account
for possible reduced capacity in tension zones? This question is not just
limited to seismic performance.

Thanks in advance for any comments.

Michael Krakower SE
Arcadia,CA



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