21.8 Determine the capacity of the attachment in Figure 21.18 adequate to carry a sustained
applied load using the bond stress Wcr = 1800 psi and tuncr = 2600 psi. The anchors have 10
threads per inch, are 3/4 in. diameter futa = 75000 psi steel embedded 8 inches into an exterior
concrete wall having a compressive strength of 4000 psi. The attachment is well away from
any edges, supplementary reinforcement is present and the anchors are considered category 2
- medium sensitivity and reliability. Comment on your solution.
The loads are sustained so only half the allowable bond stress from ACI 318 below is
≔τcr ⋅1800 psi ≔τuncr ⋅2600 psi ≔nt10 ≔hef 8in
≔nV4≔nN2≔fya 55 ksi ≔da0.75 in ≔f'c⋅4000 psi
≔ecc 3 in ≔s18in ≔s26in ≔λa1.0 ≔ϕ0.65
≔ψecNa 1.0 ≔ψedNa 1.0 ≔ψcpNa 1.0
is based on category 2 and
values result from large edge distances and no eccentricity.