Title:
Behavior of Post-Installed Anchors Tested by Stepwise Increasing Cyclic Load Protocols
Author(s):
Philipp Mahrenholtz, Rolf Eligehausen, Tara C. Hutchinson, and Matthew S. Hoehler
Publication:
Structural Journal
Volume:
113
Issue:
5
Appears on pages(s):
997-1008
Keywords:
anchor; crack; earthquake; load cycling; shear; tension; testing
DOI:
10.14359/51689023
Date:
9/1/2016
Abstract:
Cyclic loads are a characteristic feature of actions acting on structures and anchorages during earthquakes. For this reason, seismic qualification of post-installed concrete anchors according to the internationally recognized American Concrete Institute (ACI) standards ACI 355.2 and 355.4 are based on cyclic load tests. The protocols for these cyclic load tests, however, have limited scientific basis. Therefore, in the present paper, newly developed test protocols with stepwise increasing load amplitudes are used to more realistically evaluate anchor seismic performance. The study focuses on the load-displacement behavior of common anchor types installed in cracked concrete and subjected to both cyclic tension and cyclic shear actions. The results confirmed robust behavior for anchors loaded in cyclic tension even in the presence of crack widths in the anchorage material larger than currently required by ACI 355. In addition, the critical influence of low cycle fatigue on the performance of anchors loaded in cyclic shear is demonstrated.
Related References:
1. Durkin, M., and Thiel, C., “Improving Measures to Reduce Earthquake Casualties,” Earthquake Spectra, V. 8, No. 1, 1992, pp. 95-113. doi: 10.1193/1.1585672
2. Taghavi, S., and Miranda, E., “Response Assessment of Nonstructural Building Elements,” PEER 2003/05, Pacific Earthquake Engineering Research Center, University of California, Berkeley College of Engineering, Berkeley, CA, 2003, 96 pp.
3. Schuler, D., “Erdbebensicherheit von Nichtragenden Bauteilen, Installationen und Einrichtungen“ (Earthquake Resistance of Nonstructural Components), Proceedings of the Tag der Befestigungstechnik, Zürich, 2007, 6 pp. (in German)
4. Griffin, M., and Winn, V., “Nonstructural Seismic Performance for Facilities in Seismic Regions: is the Expected Earthquake Performance Really Being Achieved,” Proceedings of the ATC & SEI 2009 Conference on Improving the Seismic Performance of Existing Buildings and Other Structures, San Francisco, CA, 2009, pp. 651-662.
5. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
6. ACI Committee 355, “Qualification of Post-Installed Mechanical Anchors in Concrete (ACI 355.2-07) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2007, 39 pp.
7. ACI Committee 355, “Qualification of Post-Installed Adhesive Anchors (ACI 355.4-11) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2011, 56 pp.
8. Tang, J., and Deans, J., “Test Criteria and Method for Seismic Qualification of Concrete Expansion Anchors,” Proceedings of the 4th Canadian Conference on Earthquake Engineering, University of British Columbia, Vancouver, BC, Canada, 1983, pp. 58-69.
9. DIBt KKW Leitfaden, “Leitfaden für Dübelbefestigungen in Kernkraftwerken und anderen kerntechnischen Anlagen (Guideline for Fastenings in Nuclear Power Plants and Other Nuclear Technical Facilities),” Deutsches Institut für Bautechnik (DIBt), Berlin, 2010, 23 pp. (in German)
10. SEAOSC, “Standard Method of Cyclic Load Test for Anchors in Concrete or Grouted Masonry,” Structural Engineers Association of Southern California (SEAOSC), Whittier, CA, 1997, 6 pp.
11. Weigler, H., and Lieberum, K.-H., “Belastungsprüfungen an Liebig-Einspannankern Ultra-Plus M12, Verankert in Kreuzartig Gerissenen Betonprobekörpern Bei Stoßartiger und Statischer Belastung (Load Tests on Liebig Undercut Anchors Ultra-Plus M12, Anchored in Concrete Specimens with Intersecting Cracks Under Impact and Static Loads),” Report, Institute für Massivbau, TH Darmstadt, 1984. (in German)
12. Weigler, H., and Lieberum, K.-H., “Belastungsprüfungen an Liebig-Einspannankern Ultra-Plus M16, Verankert in Kreuzartig Gerissenen Betonprobekörpern Bei Stoßartiger und Statischer Belastung (Load Tests on Liebig Undercut Anchors Ultra-Plus M16, Anchored in Concrete Specimens with Intersecting Cracks under Impact and Static Loads),” Report, Institute für Massivbau, TH Darmstadt, 1984. (in German)
13. Hoehler, M. S., and Eligehausen, R., “Behavior of Anchors in Cracked Concrete under Tension Cycling at Near-Ultimate Loads,” ACI Structural Journal, V. 105, No. 5, Sept.-Oct. 2008, pp. 601-608.
14. Silva, J., “Test Methods for Seismic Qualification of Post-Installed Anchors,” Proceedings of the Symposium on Connections between Steel and Concrete, Stuttgart, Germany, 2001, pp. 551-563.
15. Lotze, D., “Tragverhalten und Anwendung von Dübeln unter Oftmals Wiederholter Belastung (Load Bearing Behavior and Applications for Anchors under Frequently Repeated Loads),” dissertation, University of Stuttgart, Stuttgart, Germany, 1993, 246 pp. (in German)
16. ETAG 001, “Guideline for European Technical Approval of Metal Anchors for use in Concrete, Parts 1 – 6,” European Organization of Technical Approvals (EOTA), Brussels, Belgium, 1997, 206 pp.
17. Eibl, J., and Keintzel, E., “Zur Beanspruchung von Befestigungsmitteln Bei Dynamischen Lasten (Loading of Fastenings under Dynamic Loads),” Report, IMB, Universität Karlsruhe (KIT), 1989, 169 pp. (in German)
18. Eligehausen, R.; Mallée, R.; and Silva, J., Anchorage in Concrete Construction, Ernst & Sohn, Berlin, Germany, 2006, 378 pp.
19. Eligehausen, R., and Balogh, T., “Behavior of Fasteners Loaded in Tension in Cracked Reinforced Concrete,” ACI Structural Journal, V. 92, No. 3, May-June 1995, pp. 365-379.
20. Vintzeleou, E., and Eligehausen, R., “Behavior of Fasteners under Monotonic or Cyclic Shear Displacements,” Anchors in Concrete—Design and Behavior, SP-130, American Concrete Institute, Farmington Hills, MI, 1991, pp. 181-204.
21. Klingner, R.; Mendonca, J.; and Malik, J., “Effect of Reinforcing Details on the Shear Resistance of Anchor Bolts under Reversed Cyclic Loading,” ACI Journal Proceedings, V. 79, No. 1, Jan. 1982, pp. 471-479.
22. Usami, S.; Abe, U.; and Matsuzaki, Y., “Experimental Study on the Strength of Bonded Anchors under Alternate Shear Load and Combined Load,” Proceedings of the Annual Meeting of the Kantou Branch of the Architectural Institute of Japan, 1981, 4 pp.
23. Usami, S.; Abe, Y.; Ichihashi, I.; Machiba, H.; and Muto, S., “Experimental Study on Anchor (Bolt) for Equipment’s in Nuclear Power Plants: Part 1; 2,” Proceedings of the Annual Convention of the Architectural Institute of Japan, 1987, 8 pp.
24. Guillet, T., “Behavior of Metal Anchors under Combined Tension and Shear Cycling Loads,” ACI Structural Journal, V. 108, No. 3, May-June 2011, pp. 315-323.
25. ISO 13033, “Bases for the Design of Structures—Loads, Forces, and Other Actions—Seismic Actions on Nonstructural Components for Building Applications,” International Organization for Standardization, Geneva, Switzerland, 2013, 43 pp.
26. Hutchinson, T. C., and Wood, R., “Cyclic Load Protocol for Anchored Nonstructural Components and Systems,” Earthquake Spectra, V. 29, No. 3, 2013, pp. 817-842. doi: 10.1193/1.4000169
27. Wood, R.; Hutchinson, T. C.; and Hoehler, M. S., “Cyclic Load and Crack Protocols for Anchored Nonstructural Components and Systems,” Structural Systems Research Project (SSRP) 2009/12, University of California, San Diego, La Jolla, CA, 2010, 229 pp.
28. FEMA, “Interim Testing Protocols for Determining the Seismic Performance Characteristics of Structural and Nonstructural Components (FEMA-461),” Federal Emergency Management Agency, Washington, DC, 2007, 138 pp.
29. Watkins, D. A.; Chiu, L.; Hutchinson, T. C.; and Hoehler, M. S., “Survey and Characterization of Floor and Wall Mounted Mechanical and Electrical Equipment in Buildings,” Report No. SSRP-2009/11, University of California, San Diego, La Jolla, CA, 2009, 294 pp.
30. Hoehler, M. S., and Eligehausen, R., “Behavior and Testing of Anchors in Simulated Seismic Cracks,” ACI Structural Journal, V. 105, No. 3, May-June, 2008, pp. 348-357.
31. Kim, S.-Y.; Yu, C.-S.; and Yoon, Y.-S., “Sleeve-Type Expansion Anchor Behavior in Cracked and Uncracked Concrete,” Nuclear Engineering and Design, V. 228, No. 1-3, 2004, pp. 273-281. doi: 10.1016/j.nucengdes.2003.06.018
32. Hoehler, M. S.; Eligehausen, R.; and Mahrenholtz, P., “Behavior of Anchors in Concrete at Seismic-Relevant Loading Rates,” ACI Structural Journal, V. 108, No. 2, Mar.-Apr., 2011, pp. 238-247.
33. Mahrenholtz, C., and Eligehausen, R., “Dynamic Performance of Concrete Undercut Anchors for Nuclear Power Plants,” Nuclear Engineering and Design, V. 265, 2013, pp. 1091-1100. doi: 10.1016/j.nucengdes.2013.09.038
34. Mahrenholtz, P., “Experimental Performance and Recommendations for Qualification of Post-Installed Anchors for Seismic Applications,” dissertation, University of Stuttgart, Stuttgart, Germany, 2012.
35. Ghobarah, A., and Aziz, T., “Seismic Qualification of Expansion Anchors to Canadian Nuclear Standards,” Nuclear Engineering and Design, V. 228, No. 1-3, 2004, pp. 377-392. doi: 10.1016/j.nucengdes.2003.06.020
36. Hoehler, M. S., “Behavior and Testing of Fastenings to Concrete for Use in Seismic Applications,” dissertation, University of Stuttgart, Stuttgart, Germany, 2006, 261 pp.
37. Mahrenholtz, P., “Anchor Ductility—Development of Ductility Parameters and Evaluation of Database,” Report, Institut für Werkstoffe im Bauwesen, University of Stuttgart, Stuttgart, Germany, 2011, 345 pp.
38. Henzel, J., and Stork, J., “Anchors under Predominantly Static Shear Load with Alternating Direction,” Darmstadt Concrete: Annual Journal on Concrete and Concrete Structures, V. 5, 79-86, TH Darmstadt, 1990, pp. 79-86.
39. Rieder, A., “Seismic Response of Post-Installed Anchors in Concrete,” Dissertation, Institut für konstruktiven Ingenieurbau der Universität für Bodenkultur, Wien, 2009, 148 pp.
40. Block K.; Dreier F., “Dübelbefestigungen bei ermüdungsrelevanten Einwirkungen (Anchorages under fatigue loading),” Deutsches Institut für Bautechnik, Berlin, Germany, 2002, pp. 98-105. (in German)
41. ETAG, “Annex E Guideline for European Technical Approval of Metal Anchors for Use in Concrete—Annex E: Assessment of Metal Anchors under Seismic Actions,” Brussels, Belgium, 2013, 42 pp.