TX...if you are with CRSI...GREAT! Good resource for the forums. While proprietary information is discouraged (for obvious reasons), having representatives of technical organizations is a plus for all of us. Thanks for your input.
As a trade association (and soon to be ANSI standards development organization), nothing we do is proprietary. We obviously sell books to fund our activities, but my job with the Institute is to promote the use of reinforced concrete through education and research. That means giving away the "secrets" to make it easier to design and construct with reinforced concrete.
When looking at concrete anchors, ACI 355 (Anchorage to Concrete) and the Concrete Anchor Manufacturers Association (CAMA) also have good information.
John Turner CSP PE
CRSI Greater Southwestern Regional Manager
John,
Thanks. Pleased to have you as a resource for the forums. Your technical input is valued and you have shown that it extends way beyond your CRSI involvement.
If a crack runs through the hole with the adhesive anchor, the pullout winds up being about half (Nu cracked/Nu = 0.5). This is for a crack that forms after installation. This value is not intended to be used where adhesive anchors are installed in existing cracks (who would do that?) The testing procedure actually cracks the concrete after the anchors are installed.
Ref RILEM - "International Symposium on Connections between Steel and Concrete" - U of Stuttgart
Cracks come in many forms and from many causes. An adhesive anchor installed into concrete with minor shrinkage cracks which formed at early age and which is restrained by reinforcement would be addressed differently than those installed into a flexural crack due to cyclic loading.
