AAI Anchor Spacing, Edge Distance & Embedment Depth 2

Question 1

When installing adhesive anchors at a corner where two free edges are present, the anchor capacity is affected because:

Accepted Answer

Both edge distances influence the concrete breakout capacity, resulting in greater reductions

Answer

At a corner, both edge distances independently trigger breakout capacity reductions, and the combined effect results in a larger overall reduction in anchor capacity than a single edge condition.

Question 2

The minimum spacing between adhesive anchors is most commonly expressed as a multiple of:

Accepted Answer

The effective embedment depth (h_ef)

Answer

Minimum anchor spacing is typically expressed as a multiple of the effective embedment depth (h_ef) to ensure adequate separation of bond stress zones.

Question 3

Which primary U.S. code document governs the design requirements for post-installed adhesive anchor spacing and edge distances in concrete structures?

Accepted Answer

ACI 318 — Building Code Requirements for Structural Concrete, Chapter 17

Answer

ACI 318 Chapter 17 (Anchoring to Concrete) is the governing U.S. code for post-installed anchor design, including spacing, edge distance, and embedment depth requirements.

Question 4

An installer notices that achieving the specified center-to-center spacing is impossible due to existing reinforcement. The correct action is to:

Accepted Answer

Notify the engineer of record and await revised instructions before drilling

Answer

When specified spacing cannot be achieved due to field conditions, the installer must notify the engineer of record, who must evaluate whether revised anchor placement is acceptable.

Question 5

What effect does increasing the embedment depth of an adhesive anchor typically have on its tensile (pullout) capacity?

Accepted Answer

Increases capacity because more bond area is available for load transfer

Answer

Greater embedment depth increases the bonded surface area between the adhesive and the concrete hole wall, directly increasing the tensile bond capacity of the anchor.

AAI - American Concrete Institute Adhesive Anchor Installer Certification Practice Test

AAI - American Concrete Institute Adhesive Anchor Installer Certification Practice Test

AAI Anchor Spacing, Edge Distance & Embedment Depth 2