Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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Q-1 A P P E N D I X Q AASHTO Design Specification
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Q-2 AASHTO 2010 LRFD BRIDGE DESIGN SPECIFICATIONS SECTION XXXX ADHESIVE ANCHORS X.Y-ADHESIVE ANCHORS X.Y.1-Definitions Adhesive - Chemical components formulated from organic polymers, or a combination of organic polymers and inorganic materials that cure when blended together. Adhesive anchor - A post-installed anchor, inserted into hardened concrete with an anchor hole diameter not greater than 1.5 times the anchor diameter, that transfers loads to the concrete by bond between the anchor and the adhesive, and bond between the adhesive and the concrete.
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Q-3 da = outside diameter of anchor (in.)
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Q-4 MPII, whichever is greater. • Concrete at time of installation shall have a minimum age of 21 days and a minimum compressive strength of 2500 psi.
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Q-5 where: Nn = nominal resistance of an adhesive anchor bolt or group of anchors as specified in Article X.Y.4. The factored resistance, Nr, of an adhesive anchor bolt or group of anchors at the strength limit state shall be taken as: Nr = sus Nn (X.Y.4-2)
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Q-6 X.Y.5-Adhesive Bond Failure X.Y.5.1-Nominal Resistance due to Adhesive Bond The nominal resistance of an adhesive anchor bolt or group of anchors due to adhesive bond failure shall be taken as: (X.Y.5.1-1) where: = basic bond strength of a single adhesive anchor in tension in cracked concrete as defined in Article X.Y.5.2.
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From page 237... ...
Q-7 "outdoor" condition. X.Y.5.3-Projected Influence Areas The projected influence are of a single adhesive anchor without the influence of edge or spacing effects used to determine bond strength, , shall be computed as: (X.Y.5.3-1)
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Q-8 Figure 3: Projected influence area ANa for a group of anchors X.Y.5.4-Modification Factor for Edge Effects The modification factor, , for anchors located close to an edge beyond what is accounted for in Article X.Y.5.3, shall be computed as: If cmin ≥ cNa then (X.Y.5.4-1) If cmin < cNa then (X.Y.5.4-2)
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From page 239... ...
Q-9 X.Y.6-Concrete Breakout Failure X.Y.6.1-Nominal Resistance due to Concrete Breakout Failure The nominal resistance of an adhesive anchor bolt or group of anchors due to concrete breakout failure shall be taken as: (X.Y.6.1-1) where: = basic concrete breakout strength of a single adhesive anchor in tension in cracked concrete as defined in Article X.Y.6.2.
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From page 240... ...
Q-10 X.Y.6.3-Projected Influence Areas The projected influence area of a single adhesive anchor without the influence of edge or spacing effects used to determine concrete breakout strength, , shall be computed as: (X.Y.6.3-1) where: (X.Y.6.3-2)
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Q-11 Figure 7: Projected influence area ANa for a group of anchors X.Y.6.4-Modification Factor for Edge Effects The modification factor anchors located close to an edge beyond what is accounted for in Article X.Y.6.3, shall be computed as: If cmin ≥ cNc then (X.Y.6.4-1) If cmin < cNc then (X.Y.6.4-2)
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From page 242... ...
Q-12 "Fastenings to Concrete and Masonry Structures, State of the Art Report," Comité Euro-International du Béton (CEB) , Bulletin No.
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