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Table 17.5.2 - Design strength requirements of anchors
| Failure mode | Single anchor |
Anchor group[1] | |
| Individual anchor in a group |
Anchors as a group |
||
| Steel strength in tension (17.6.1)[2] |
ϕNsa ≥ Nua | ϕNsa ≥ Nua,i | |
| Concrete breakout strength in tension[3] (17.6.2) |
ϕNcb ≥ Nua | ϕNcbg ≥ Nua,g | |
| Pullout strength in tension (17.6.3) |
ϕNpn ≥ Nua | ϕNpn ≥ Nua,i | |
| Concrete side-face blowout strength in tension (17.6.4) |
ϕNsb ≥ Nua | ϕNsbg ≥ Nua,g | |
| Bond strength of adhesive anchor in tension (17.6.5) |
ϕNa ≥ Nua | ϕNag ≥ Nua,g | |
| Steel strength in shear (17.7.1) |
ϕVsa ≥ Vua | ϕVsa ≥ Vua,i | |
| Concrete breakout strength in shear[3] (17.7.2) |
ϕVcb ≥ Vua | ϕVcbg ≥ Vua,g | |
| Concrete pryout strength in shear (17.7.3) |
ϕVcp ≥ Vua | ϕVcpg ≥ Vua,g | |
[1]Design strengths for steel and pullout failure modes shall be calculated for the most highly stressed anchor in the group.
[2]Sections referenced in parentheses are pointers to models that are permitted to be used to evaluate the nominal strengths.
[3]If anchor reinforcement is provided in accordance with 17.5.2.1, the design strength of the anchor reinforcement shall be permitted to be used instead of the concrete breakout strength
출처: ACI318-19
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