Epoxy Anchor Pullout Calculator

Inputs

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Nominal anchor, threaded rod or bolt diameter used for the bonded perimeter and steel area.
in
Effective bonded embedment depth in the concrete or masonry substrate.
in
Applied or design tension load being screened against the calculated capacity.
lbf
Use an allowable or nominal bond stress from the adhesive manufacturer, test data, project criteria or conservative engineering assumption.
ksi
Allowable tensile stress for the anchor steel before applying the entered safety factor.
ksi
Divides both nominal bond strength and entered steel capacity.
Nearest concrete edge distance for context only. Concrete breakout, pryout and edge reduction are not calculated here.
in

Results

Default result
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Governing tension capacity(T_allow)
2,094lbf
Pass

9.316 kN · 2,094 lbf

Minimum of bond and steel design capacity; bond capacity governs.

Minimum of bond design capacity and steel design capacity.

Also computed

Utilization(U)Pass71.62%

Target tension is below the screening capacity.

Target tension divided by governing capacity.

Required embedment(h_req)Pass2.865in

Entered embedment clears the bond-only tension target.

Embedment needed for target tension using entered bond stress and safety factor.

Bond design capacity(T_bond)2,094lbf

9.316 kN · 2,094 lbf

Bond nominal strength divided by the entered safety factor.

pi*d*h*tau_b / SF.

Steel design capacity(T_steel)2,356lbf

10.48 kN · 2,356 lbf

Anchor steel tensile capacity divided by the entered safety factor.

pi*d^2/4*sigma_s / SF.

Bond nominal strength(T_nom)6,283lbf

27.95 kN · 6,283 lbf

pi*d*h*tau_b before safety factor.

Before the entered safety factor.

Bonded surface area(A_bond)6.283in²

Cylindrical bonded surface area pi*d*h.

Method notes 3 notes
  • Bond screen: T_bond = pi*d*h*tau_b / SF using the entered bond stress and effective embedment.
  • Steel screen: T_steel = (pi*d^2/4)*sigma_s / SF using gross circular steel area.
  • This is not an ACI 318, ACI 355, ICC-ES, ETA or manufacturer anchor design. It does not check concrete breakout, pullout cone geometry, pryout, cracked concrete, seismic categories, edge distance reductions, spacing/group interaction, sustained load, installation torque, hole cleaning, adhesive cure temperature, moisture condition or inspection requirements.

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