446.3R-97: Finite Element Analysis of Fracture in Concrete Structures
Link
SP-205: Finite Element Analysis of Reinforced Concrete Structures
Link
SP-237: Finite Element Analysis of Reinforced Concrete Structures
Link
Would note that the last two are collections of papers rather than a consolidated document. If you're looking for something similar to Annex C of EC3, then I'm not sure you'll find it in US codes. Using EC3 annex as a guide is probably a good start though.
The ACI committee for this is 447. Supposedly they're developing a bunch of different documents, but I haven't seen anything come out yet.
Committee 447 - Finite Element Analysis of Reinforced Concrete Structures
AISC response to FEA-related question in the past:
Does the AISC Specification define acceptance criteria for steel when using finite-element modeling to assess the stress distribution?
No. Assessment of results employing finite-element modeling techniques is really a matter of engineering judgment. The AISC Specification limit states are based on use of average stresses in most cases; not peak stresses as may result from a finite element analysis. When such is used, engineering judgment is involved as to how this may relate to the Specification parameters, and is beyond the scope of the Specification. Localized stresses in members are assumed to redistribute through inelastic deformation thus justifying the use of average values. Where such localized stresses can be cause for failure, such as at net sections, the Specification accounts for them separately. Please note that AISC typically deals in member strength values that correspond to the entire member cross-section, while finite element programs are likely to give stress values that vary across the member cross-section.
July 2010 Steel Interchange
