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

Steel fracture of the anchor rod

Answer

Adhesive bond failure at the rod-to-adhesive interface

Answer

Adhesive creep failure under sustained load

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

Increase the anchor rod diameter to distribute load over the thinner section

Answer

Reduce the embedment depth by 10% to avoid punching through the opposite face

Answer

Install a backing plate on the opposite face to prevent blowout

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

Determine the required volume of adhesive cartridge for the installation

Answer

Establish the required torque wrench setting for the anchor nuts

Answer

Define the zone where supplemental reinforcement must be placed

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

Critical edge distance for the product

Answer

Required edge distance for seismic applications

Answer

Recommended edge distance for full efficiency

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

Anchors installed at the critical edge distance exactly

Answer

Anchors installed at twice the critical edge distance

Answer

Anchors installed in the interior of a large slab away from all edges

Question 6

The manufacturer's printed installation instructions (MPII) for an adhesive anchor system specify a minimum embedment depth of 4 inches. The engineer has specified 3.5 inches for a particular application. The installer should:

Accepted Answer

Install at 4 inches per the MPII and notify the engineer of the discrepancy

Answer

Install at 3.5 inches since the engineer's specification overrides the MPII

Answer

Refuse to install and leave the job site immediately

Answer

Average the two values and install at 3.75 inches as a compromise

Question 7

In seismic design categories C through F, post-installed adhesive anchors used for structural connections must meet which additional qualification requirement beyond basic ACI 318 provisions?

Accepted Answer

Anchors must be qualified for seismic applications through testing per ACI 355.4 or ICC-ES AC308 seismic protocols

Answer

Anchors must be hot-dip galvanized to prevent corrosion-induced failure during seismic events

Answer

Anchor spacing must be doubled compared to non-seismic applications

Answer

Anchor embedment depth must equal at least one-half the member thickness