Concrete Anchor Design: screw_anchor
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) | torque installation ft lb (ft-lb) | typical applications |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| screw_anchor | SCR_375_01 | 62 | 44 | 0.0775 | 2,489 | 3.75 | 3.75 | 1.75 | 3.5 | 0.375 | 9.5 | Concrete screw (Tapcon type); thread form cuts into hardened concrete; futa~62ksi typical; Nb=17*sqrt(4000)*1.75^1.5=2489 lb; cac=2.5hef=4.375in for uncracked; minimum edge 2.5in per ESR; torque controlled installation | 0.6 | 0.65 | No | Carbon-high-str | 2,880 | 4,805 | 10 | light-duty concrete screw, electrical, light HVAC |
| screw_anchor | SCR_375_02 | 62 | 44 | 0.0775 | 4,250 | 3.75 | 5 | 2.5 | 3.5 | 0.375 | 9.5 | Nb=17*sqrt(4000)*2.5^1.5=4250 lb; minimum slab thickness 3.5in | 0.6 | 0.65 | No | Carbon-high-str | 2,880 | 4,805 | 10 | HVAC, light conduit, cable tray |
| screw_anchor | SCR_500_01 | 62 | 44 | 0.1419 | 5,587 | 5 | 6 | 3 | 4.5 | 0.5 | 12.7 | Concrete screw 1/2in; Nb=17*sqrt(4000)*3.0^1.5=5587 lb; max torque 25 ft-lb must not exceed to prevent thread strip-out | 0.6 | 0.65 | No | Carbon-high-str | 5,276 | 8,800 | 25 | medium-duty mechanical, conduit, HVAC units |
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