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Cogged Bolt Capacity - ACI318 App D

Cogged Bolt Capacity - ACI318 App D

Cogged Bolt Capacity - ACI318 App D

(OP)
I have been looking at the capacity of cogged (L) hold down bolts in ACI318. Using equation D-14 I get a capacity well below the capacity of the bolt itself in 25MPa concrete.
Is this correct or have I done something wrong?

RE: Cogged Bolt Capacity - ACI318 App D

Appendix D intentionally severely penalizes the strength of J-bolts in the hopes of making designers use headed anchor rods or rods with nuts on the end instead.  This is due to numerous studies showing that the J-bolts tend to straighten out and crush the concrete adjacent to the J at fairly low load levels compared to the bolt strength.  

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