Title:
Shear Behavior and Design of Post-Installed Anchors in Thin Concrete Members
Author(s):
Ahmad N. Tarawneh, Brandon E. Ross, and Thomas E. Cousins
Publication:
Structural Journal
Volume:
117
Issue:
3
Appears on pages(s):
311-322
Keywords:
adhesive anchors; concrete breakout; post-installed anchors; screw anchors; shear capacity; shear test; thin concrete members
DOI:
10.14359/51723508
Date:
5/1/2020
Abstract:
This paper presents an experimental program investigating the behavior of single screw and adhesive anchors embedded in thin concrete with full thickness embedment depth subjected to shear load toward the free edge. Variables included: concrete thickness, concrete compressive strength, anchor diameter, anchor type, and edge distance. Anchors were embedded through the full thickness of the concrete member and the effects of back-face blowout due to drilling were considered. Based on the experimental results of 149 tests, it was shown that concrete capacity design (CCD) method underestimates the shear capacity of the anchors. Application of the thickness modification factor from ACI 318-14 overcorrects for the conservatism in the CCD approach and can lead to unconservative calculated capacities. An alternative thickness modification factor is presented which results in more accurate calculations of shear capacity. Finally, a design model is proposed for shear capacity of a single anchor installed in thin uncracked concrete members with full thickness embedment. The design model is based on 5% fractile of the experimental capacities.
Related References:
1. ICC Evaluation Service AC193, “Acceptance Criteria for Mechanical Anchors in Concrete Elements,” Whittier, CA, Feb. 2010.
2. ICC Evaluation Services AC308, “Acceptance Criteria for Post Installed Adhesive Anchors in Concrete,” Whittier, CA, 2008.
3. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 520 pp.
4. Tarawneh, A. N., “Behavior and Design of Screw and Adhesive Anchors in Thin Concrete Members,” doctoral dissertation, Clemson University, Clemson, SC, 2019, https://tigerprints.clemson.edu/all_dissertations/2353. (last accessed Apr. 21, 2020)
5. PCI Design Handbook – Precast and Prestressed Concrete, eighth edition, Precast/Prestressed Concrete Institute, Chicago, IL, 2017.
6. Cook, R. A.; Burtz, J. L.; and Ansley, M. H., “Design Guidelines and Specifications for Engineered Grouts,” FDOT Research Report BC354RPWO, No. 48, Aug. 2003, available at http://www.dot.state.fl.us/researchcenter/Completed_Structures.htm.
7. Eligehausen, R.; Cook, R. A.; and Appl, J., “Behavior and Design of Adhesive Bonded Anchors,” ACI Structural Journal, V. 103, No. 6, Nov.-Dec. 2006, pp. 822-831.
8. Eligehausen, R.; Mallee, R.; and Silva, J., Anchorage in Concrete Construction, Ernst & Sohn, Berlin, Germany, 2006, 391 pp.
9. Fuchs, W.; Eligehausen, R.; and Breen, J., “Concrete Capacity Design (CCD) Approach for Fastening to Concrete,” ACI Structural Journal, V. 92, No. 1, Jan.-Feb. 1995, pp. 73-94.
10. Fuchs, W., “Tragverhalten von Befestigungen unter Querlast im ungerissenen Beton (Behaviour of Fastenings under Shear Load in Uncracked Concrete),” Mitteilungen No. 1990/2, Institut fiir Werkstoffe im Bauwesen, Universitlit Stuttgart, 1990.
11. Eligehausen, R.; Fuchs, W.; and Hofmann, J., “Shear Towards the Free Edge – An Example using ACI 318-02, Appendix D,” Discussion of paper by Burdette, E. G. and Zisi, N,” Concrete International, Mar. 2004.
12. ASTM E488/E488M-15, “Standard Test Methods for Strength of Anchors in Concrete Elements,” ASTM International, West Conshohocken, PA, 2015, 20 pp., https://doi.org/10.1520/E0488_E0488M-15.10.1520/E0488_E0488M-15
13. ASTM A193/A193M-19, “Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications,” ASTM International, West Conshohocken, PA, 2019, 13 pp.
14. ACI Committee 355, “Qualification of Post-Installed Mechanical Anchors in Concrete (ACI 355.2-07) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2007, 35 pp.
15. Owen, D. B., “Factors for One-Sided Tolerance Limits and for Variables Sampling Plans,” No. SCR-607, Sandia Corp., Albuquerque, New Mexico, 1963.