Design cast-in headed anchors checking tension breakout, pullout, shear breakout, pryout, and interaction. Use for base plate anchors, equipment anchorage, or overhead connections to concrete. Compliant with ACI 318-19 Chapter 17. Free to use. SI and Imperial units supported. No signup required.
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Anchor Bolt Design Reset Cast-in headed anchor — breakout, pullout, pryout
Tension — Steel ACI 318-19 Ch.17
✓ Tension — Breakout ACI 318-19 §17.4.2
Ncbg Tension — Pullout ACI 318-19 §17.4.3
Npn Governing Tension
φNn = 74.7 kN Shear — Steel ACI 318-19 Ch.17
✓ Shear — Breakout ACI 318-19 §17.5.2
Vcbg Shear — Pryout ACI 318-19 §17.5.3
Vcp Governing Shear
φVn = 42.6 kN Interaction ACI 318-19 §17.6
✓ PASS Step Formula Substitution Result Steel N_{sa} = A_{se}f_{ut} material props 182.9 kN Breakout N_{cbg} ACI 17.6.2.1 106.7 kN Pullout N_{pn} ACI 17.6.3.1 224 kN φNn φ×min(Nsa,Ncbg,nNpn) 0.75×min(182.9, 106.7, 224) 74.7 kN ✓
Step Formula Substitution Result Steel V_{sa} = n×0.6A_{se}f_{ut} 2×0.6×A_{se}×f_{ut} 219.5 kN Breakout V_{cbg} ACI 17.7.2.1 60.9 kN Pryout V_{cp} = k_{cp}N_{cbg} 2×106.7 213.5 kN φVn φ×min(Vsa,Vcbg,Vcp) 0.65×min(219.5, 60.9, 213.5) 42.6 kN ✓
Step Formula Substitution Result Ratio DCR_T + DCR_V ≤ 1.2 0.402+0.469 0.502 ✓
[1]
Anchor Bolt Design
ACI 318-19 Ch.17
Project: N/A · Engineer: N/A · Date: 10/10/2026 · Rev: 0
[2]
Design reference: ACI 318-19 Ch.17
[3]
Given: db = 19 mm (Bolt ∅)
hef = 150 mm (Embed)
f'c = 28 MPa (f'c)
[4]
Tension Capacity ACI 318-19 Ch.17
Steel = Nsa = Asefut
= material props
= 182.9 kN
Breakout = Ncbg
= ACI 17.6.2.1
= 106.7 kN
Pullout = Npn
= ACI 17.6.3.1
= 224 kN
φNn = φ× min (Nsa,Ncbg,nNpn )
= 0.75× min (182.9, 106.7, 224)
= 74.7 kN
[5]
Shear Capacity ACI 318-19 Ch.17
Steel = Vsa = n × 0.6Asefut
= 2× 0.6× Ase × fut
= 219.5 kN
Breakout = Vcbg
= ACI 17.7.2.1
= 60.9 kN
Pryout = Vcp = kcpNcbg
= 2× 106.7
= 213.5 kN
φVn = φ× min (Vsa,Vcbg,Vcp )
= 0.65× min (219.5, 60.9, 213.5)
= 42.6 kN
[6]
Interaction ACI 318-19 Ch.17
Ratio = DCRT + DCRV ≤ 1.2
= 0.402+0.469
= 0.502
[7]
Interaction
PASS
0.502 ≤ 1.2