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Concrete Accessories

DYWIDAG Expansion Anchor

5/8“ Expansion Anchor

DYWIDAG Expansion Anchor can be used with 5/8“THREADBAR®. These anchors are used in many applications including one sided forming off existing concrete or temporary tiedowns in existing slabs. The fast DYWIDAG thread pattern (21/2 threads per inch) provides quick installation and stripping. Available in two bore hole diameters (33 – 36 mm and 35 – 38 mm), simply determine the estimated compressive strength of existing concrete and the depth of the hole.

Embedded Anchor Capacities

Ultimate load Fu in kips (use appropriate factor of safety)

The capacity of embedded anchors in concrete is estimated using the truncated cone break-out failure mechanism.

The concrete cone angle can be assumed as a = 55° to the axis of the load. The ultimate load can be computed using the equatation according to ACI 318 appendix D.

* The spacing of expansion anchors shall not be less than 3 times the effective embedment length.

Drill hole depth [in]Concrete strength [psi]
3000350040004500500055006000
84.85.25.65.96.26.66.85/8"
97.48.08.69.19.610.110.5
1010.411.212.012.813.414.114.7
1113.714.815.816.817.718.519.4
1217.218.619.921.122.323.324.4
1321.122.824.325.827.228.529.8
1425.127.229.030.832.534.035.6
1529.431.834.036.138.039.941.6
1634.036.739.241.643.946.048.07/8"
1738.741.844.747.450.052.454.7
1843.647.150.453.556.359.161.7
1948.852.756.359.763.066.069.0
2054.158.462.566.369.873.276.5
2159.664.468.873.076.9
2265.370.575.4
2371.176.8
2477.1

Assume expansion shell length 5“

Equation (ACI 318 appendix D):
Fu = k * √fc‘ * L32
Fu = ultimate load [lbf]
L = effective embedment length [in]
k = 17 factor for post-installed anchor
√fc‘ = concrete shear stress [psi]

Example:
L = 11“
k = 17
fc‘ = 4000 psi
compute Fu:
Fu = 39200 lbf = 39.2 kips
For a forming application the Safe Load is
Fu/2 = 19.6 kips
The drill hole depth is 11“ + 5“ = 16“

Safe working load = Fu / safety factor
Drill hole depth:
Add up expansion shell length (approx. 5“) and effective embedment length

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