Unique anchor identifier from the reference table (e.g., 'CIP-0.5-6'). If provided, bypasses type/diameter lookup. Provide either anchor_id or both nominal_diameter_in and anchor_type.

Nominal anchor bolt diameter in inches. Common sizes: 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/4 in. Only required when anchor_id is not provided.

Anchor installation type. Accepted values: 'cast-in', 'headed-bolt', 'wedge', 'expansion', 'adhesive', 'epoxy'. Affects phi factors and splitting checks per ACI 318-19 Ch. 17. Only required when anchor_id is not provided.

Factored tensile demand on the anchor group in kips. Per ACI 318-19 load combinations (typically 1.2D + 1.6L or seismic combos).

Factored shear demand on the anchor group in kips. Per ACI 318-19 load combinations. Combined with tension via tri-linear interaction check.

Specified 28-day compressive strength of concrete in psi. Common values: 3000-6000 psi for cast-in-place. Affects concrete breakout capacity (proportional to sqrt(f'c)). If omitted, defaults to 4000 psi.

Distance from anchor centerline to the nearest concrete free edge in inches. Critical for concrete breakout capacity. ACI 318-19 edge effects apply when ca1 < 1.5*hef.

Center-to-center spacing between anchors in a group, in inches. If omitted, defaults to 3*hef (no group overlap). Closer spacing reduces projected breakout area.

Number of anchors in the group sharing the applied load. Single anchor = 1. Group effects on projected breakout area are computed per ACI 318-19 Sec. 17.6.2. If omitted, defaults to 1.

Concrete cracking condition at the anchor location. 'cracked' is the default conservative assumption per ACI 318-19. 'uncracked' yields higher phi factors and modification factors. If omitted, defaults to cracked.

Whether seismic design provisions apply. If True, applies an additional 0.75 reduction factor to all phi values per ACI 318-19 Sec. 17.10.5.4. If omitted, defaults to False (non-seismic).