AAI Anchor Spacing, Edge Distance & Embedment Depth 3

Question 1

For a single adhesive anchor loaded in tension, the failure mode most sensitive to insufficient edge distance is:

Accepted Answer

Concrete side-face blowout or edge breakout

Answer

Insufficient edge distance leads to concrete side-face blowout or concrete edge breakout failure, where the concrete cone or wedge breaks away toward the free surface.

Question 2

When the concrete member thickness is exactly equal to the minimum required thickness for the specified embedment depth, the installer should:

Accepted Answer

Proceed normally because the minimum thickness requirement is satisfied

Answer

The minimum member thickness requirement exists precisely to define the boundary condition — meeting the minimum exactly is acceptable per the product evaluation report.

Question 3

When anchor rods are installed in a rectangular pattern (group anchorage), the 'anchor influence area' concept is used to:

Accepted Answer

Calculate the projected failure area for concrete breakout capacity of the group

Answer

The anchor influence area (A_Nc) is the projected area of the concrete failure cone for a group of anchors, used to calculate reduced group concrete breakout capacity in tension.

Question 4

An installer is directed to place anchors at 3d_a edge distance where d_a is the anchor rod diameter. This is most likely the:

Accepted Answer

Minimum permitted edge distance below which installation is not allowed

Answer

3d_a is a common minimum edge distance value representing the absolute lower limit below which anchor installation is prohibited, not the value for full capacity.

Question 5

Which situation would most likely require the engineer of record to recalculate anchor capacity using reduced edge distance modification factors?

Accepted Answer

Anchors installed between the minimum and critical edge distances

Answer

When the actual edge distance falls between the minimum and critical values, ACI 318 requires applying modification factors (ψ_ed,N and ψ_ed,V) that reduce calculated capacity.

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 3