Concrete Anchor Design: cast_in_headed_stud
Concrete anchor design data per ACI 318-19 Chapter 17. Covers cast-in and post-installed anchor types: cast-in headed bolt (F1554 Gr.36/55/105), cast-in J-bolt, cast-in headed stud (AWS/A108), expansion wedge anchor, expansion sleeve anchor, undercut anchor, adhesive threaded rod (AC308), adhesive rebar, and concrete screw anchor. Fields include nominal diameter, effective embedment hef, effective stress area Ase, bearing area Abrg, steel tensile strength Nsa, shear strength Vsa, concrete breakout Nb at f'c=4000 psi (kc=24 cast-in, kc=17 post-installed), pullout Np, critical edge distance cac, critical spacing, minimum member thickness, installation torque, phi factors for tension and shear, and seismic qualification. Sources: ACI 318-19 Ch.17, ACI 355.2/355.4, ASTM F1554, ASME B1.1, ICC-ES AC193/AC308.
| anchor type | record id | Fu ksi (ksi) | Fy ksi (ksi) | anchor area Ase in2 (in2) | concrete breakout Nb lb (lb) | critical edge distance cac in (in) | critical spacing in (in) | effective embedment hef in (in) | min member thickness in (in) | nominal diameter in (in) | nominal diameter mm (mm) | notes | phi shear | phi tension | seismic qualification | steel grade | steel shear strength lb (lb) | steel tensile strength lb (lb) | typical applications |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| cast_in_headed_stud | CIHS_375_01 | 65 | 51 | 0.1104 | 9,411 | 5.063 | 6.75 | 3.375 | 6.75 | 0.375 | 9.5 | Nelson/AWS stud Type B; Ase=pi*d^2/4=0.1104 in2 (plain shank); futa=65ksi per A108; Nsa=0.1104*65000=7176 lb; Nb=24*sqrt(4000)*3.375^1.5=9411 lb kc=24 cast-in; phi=0.75 (ductile stud per ACI 17.5.3.1.2); Np omitted — bearing area varies by head | 0.65 | 0.75 | Yes | A108-B | 4,303 | 7,176 | composite decks, concrete-to-steel, shear studs |
| cast_in_headed_stud | CIHS_500_01 | 65 | 51 | 0.1963 | 14,490 | 6.75 | 9 | 4.5 | 9 | 0.5 | 12.7 | Ase=pi*(0.5)^2/4=0.1963 in2; futa=65ksi; Nsa=12760 lb; Nb=24*sqrt(4000)*4.5^1.5=14490 lb; phi=0.75 ductile stud; head diameter 0.875in typical giving Abrg=0.601-0.196=0.405 in2 | 0.65 | 0.75 | Yes | A108-B | 7,654 | 12,760 | composite beams, shear connectors, slab-to-beam |
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