Long-Term Performance of Epoxy Adhesive Anchor Systems (2013) / Chapter Skim
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R-1 A P P E N D I X R AASHTO Design Guideline
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R-2 AASHTO DESIGN GUIDELINES FOR ADHESIVE ANCHOR SYSTEMS This guideline addresses the design of adhesive anchor systems in transportation applications. ADHESIVE ANCHOR SYSTEMS Adhesive anchor systems are used to connect new construction to existing concrete using an adhesive and a threaded rod or reinforcing bar in holes with diameters no larger than 1.5 times the anchor diameter.
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R-3 experienced by the anchor. If an anchor is exposed to service temperatures greater than or equal to 120°F for significant portions of its service life, the anchor should be evaluated for temperature category B (ACI 355.4 §8.5)
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R-4 Adhesive anchors are susceptible to anchor spacing and distance to an edge. If located too close to each other or to an edge, adhesive anchors will not be able to fully develop their design strength.
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R-5 SAMPLE CALCULATIONS Included in this design guideline are two examples of sample calculations using the AASHTO design specifications for adhesive anchors found in AASHTO 2010 LFRD Bridge Design Specifications Section X.Y. The first example is for a single anchor in tension and the second example is for a group of anchors in tension.
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R-6 Single Adhesive Anchor Sample Calculations Given: 5/8" ASTM A193 grade B7 threaded rod Effective embedment depth = 5" Anchor is located 7" from the nearest edge Conditions of X.Y.1 are satisfied Adhesive anchor system is not chosen Anchor is subjected to sustained load f'c = 4000 psi Find: Find the factored resistance Nr Calculation in accordance with the proposed AASHTO Design Specifications for Adhesive Anchors Code Reference DETERMINE RESISTANCE FACTORS Assume category 3 ASTM A193 B7 is considered a ductile steel element Assume a structure lifetime of 75 years X.Y.2 X.Y.2 X.Y.2
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R-7 CALCULATE THE FACTORED RESISTANCE DUE TO ADHESIVE BOND FAILURE Calculate Projected Influence Areas Figure 2: Schematic of ANao. Figure 3: Schematic of ANa.
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R-8 Calculate the Basic Bond Strength Determine characteristic bond stress Since product is not chosen, use the minimum values specified in X.Y.3.2 for sustained load applications Calculate the basic bond strength X.Y.3.2 (X.Y.3.2-1) Calculate the Nominal Resistance Due to Adhesive Bond (X.Y.3.1-1)
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R-9 Determine the center to the edge of an assumed failure prism with a 35° angle Determine the projected influence area without the influence of edge effects Determine the projected influence area of a single anchor (X.Y.4.3-2)
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R-10 CALCULATE THE FACTORED RESISTANCE DUE TO STEEL FAILURE Calculate the Nominal Resistance Due to Steel Failure (6.13.2.10.2-1) Calculate the Factored Resistance Due to Steel Failure (X.Y.2-2)
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R-11 Adhesive Anchor Group Sample Calculations Given: 4 5/8" ASTM A193 grade B7 threaded rod Effective embedment depth = 5" Centerlines of anchor group are located 6" from the one edge and 7" from another edge Anchors are spaced 8" apart Conditions of X.Y.1 are satisfied Adhesive anchor system is chosen Category 1 Temperature range A (maximum short term = 110°F) (maximum long-term = 80°F)
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R-12 CALCULATE THE FACTORED RESISTANCE DUE TO ADHESIVE BOND FAILURE Calculate Projected Influence Areas Determine the critical radial distance from the centerline of the anchor to where the stresses in the concrete are negligible (X.Y.3.3-2) Figure 6: Schematic of ANao.
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R-13 Calculate the Modification Factor for Edge Effects Determine cmin Since (X.Y.3.4-2) Calculate the Basic Bond Strength Obtain characteristic bond stress from ICC-ES AC308 ESR Calculate the basic bond strength ICC-ES AC308 ESR (X.Y.3.2-1)
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R-14 Calculate Projected Influence Areas Determine the center to the edge of an assumed failure prism with a 35° angle (X.Y.4.3-2) Figure 8: Schematic of ANco.
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R-15 Since (X.Y.4.4-2) Calculate the Basic Concrete Breakout Strength Calculate the basic concrete breakout strength (X.Y.4.2-1)
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