Anchor Spacing, Edge Distance & Embedment Depth Flashcards
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Read the first 7 Anchor Spacing, Edge Distance & Embedment Depth flashcards as text
When installing adhesive anchors at a corner where two free edges are present, the anchor capacity is affected because:
Answer: Both edge distances influence the concrete breakout capacity, resulting in greater reductions
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.
The minimum spacing between adhesive anchors is most commonly expressed as a multiple of:
Answer: The effective embedment depth (h_ef)
Minimum anchor spacing is typically expressed as a multiple of the effective embedment depth (h_ef) to ensure adequate separation of bond stress zones.
Which primary U.S. code document governs the design requirements for post-installed adhesive anchor spacing and edge distances in concrete structures?
Answer: ACI 318 — Building Code Requirements for Structural Concrete, Chapter 17
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.
An installer notices that achieving the specified center-to-center spacing is impossible due to existing reinforcement. The correct action is to:
Answer: Notify the engineer of record and await revised instructions before drilling
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.
What effect does increasing the embedment depth of an adhesive anchor typically have on its tensile (pullout) capacity?
Answer: Increases capacity because more bond area is available for load transfer
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.
The 'critical edge distance' (c_ac) specified for an adhesive anchor system is determined by:
Answer: Testing and product qualification per ICC-ES AC308 and published in the product evaluation report
The critical edge distance for a specific adhesive anchor product is established through testing under ICC-ES AC308 protocols and is published in the product's evaluation report (ESR).
If an adhesive anchor group must resist combined tension and shear near a free edge, which interaction condition must the designer evaluate?
Answer: Combined tension and shear interaction per ACI 318-14 Section 17.6
ACI 318 Section 17.6 requires evaluation of the combined tension and shear interaction for anchors subjected to both loading types, using a trilinear or parabolic interaction equation.