under the provisions of ACI 318. Generally, concrete anchors must be qualified if their failure would compromise the safety or result in substantial economic damage. Expansion, undercut, and adhesive anchors are examples of post-installed anchors. Projected area is the area on the free surface of the concrete member that is used to represent the larger base of … Post-installed anchors must meet ACI 355.2 or AQCI 355-4 (D3.3.3) Anchors in ... ACI 318-11 defines stretch length as the length of anchor extending beyond the concrete, subject to tensile load. ... multiple cast-in or post-installed products DEWALT has to offer. He is involved with anchorage issues through his participation on ACI 355 – Anchorage to Concrete, ACI 318-B – Reinforcement, and ACI 318 – Structural Concrete Building Code. Most building codes currently reference ACI 318 – 11 Appendix D as the required provision for designing a wide variety of anchor types that include expansion, undercut, adhesive and cast-in-place anchors in concrete base materials. This anchor type was accepted by ACI 318-11 in a three-part acceptance format: Adhesive anchors were incorporated into ACI 318 under the premise that the existing design models would be minimally affected. AC193 also outlines the qualification tests required for screw anchors. (203mm) masonry wall, see Figure 5 … B&O Railroad Bridge at Harpers Ferry – 1836, Engineering Evaluation of Fire Damage to Concrete Foundations. Th… Olsen, J., Pregartner, T., and Lamanna, A.J. Post-installed mechanical anchors are included in the scope of ACI 318 Appendix D, and post-installed adhesive anchors are addressed in ICC-ES acceptance criteria that reference ACI 355.2. Mechanical anchors are included in the new certification program. There are a wide variety of post-installed concrete anchors, and the newest post-installed anchor is the screw anchor. Quick Anchor is an easy-to-use computer program to calculate the tensile and shear strengths of cast-in-place and post-installed anchors (single or a group) in accordance with the provisions of ACI 318 Appendix D. Through a simple and intuitive interface, Under certain circumstances an exception in D8.4 allows a smaller spacing for an anchor sized do if the strength is based on a smaller assumed anchor diameter do'. In Figure 1, the undercutting of the threads in the concrete is illustrated. This new program builds upon the ACI Adhesive Anchor Installation Inspector certification program, and includes inspection of post-installed mechanical anchors. A design procedure for screw anchors does exist; they can be safely designed using a procedure found in ICC/ES AC193 (2012). ACI 355.4 Qualification of Post-Installed Adhesive Anchors in Concrete, Chapters 1–3 and 10–13 ACI 355.2 Qualification of Post-Installed Mechanical Anchors in Concrete and Commentary, Chapters 1–3, 6, and R1–R4 ICC-ES ESR-2583 PE1000+®, Epoxy Adhesive Anchor System in Crack and Uncracked Concrete (Dewalt/Powers) Qualification of Post-Installed Adhesive Anchors in Concrete (ACI 355.4) and Commentary First Printing August 2011 ISBN 978-0-87031-393-6 ... for design in accordance with ACI 318, Appendix D. Appendix D requires that anchors be tested either for use. Post-installed adhesive anchor systems have been around since the mid-1970s and are widely used in construction today for a variety of applications including attachment of threaded rods and reinforcement to concrete. However, the U.S. is under a stepped phase-in period for adoption of the design and qualification of adhesive anchors. In 12 years, we have codified anchorag… Example 01: Anchor Bolt + Anchor Reinft + Tension & Shear + ACI 318-08 Code . Post-installed adhesive anchors shall not be used in sustained tension load applications. Testing referenced in the ESR’s by the manufacturers will conform to the revised AC308, which is essentially ACI 355.4-11. ICC Evaluation Service – ICC/ES (2013), Acceptance Criteria For Post-Installed Adhesive Anchors In Concrete Elements – AC308, ICC Evaluation Service, LLC (ICC-ES), Whittier, California, December, 122 pp. New ACI 318 Code requirements, however, will make installing anchors a bit more challenging. The ACI qualification standard, ACI 355.2, is being updated to include screw anchor qualification testing.▪. STRUCTURE® magazine is a registered trademark of the National Council of Structural Engineers Associations (NCSEA). To provide the mechanical interlock to the concrete, the screw anchor cuts a thread into the concrete during the installation process. There are actually several factors that affect proper anchor choice, so considering them all is essential. al., 2012). 1.3 ACI 355.2 applies to post-installed mechanical anchors (torque-controlled expansion achors, displacement-controlledn expansion anchors, and undercut anchors) placed into predrilled holes and anchored within the concrete by mechanical means. They are intended to carry direct tension, direct shear, or combinations of tension and shear loadings. For post-installed mechanical anchors, anchors must be qualified to the criterion in the ACI 355.2 standard (ACI 355 2007). 2011-12-16 Rev 1.0.0 Page 6 of 155 For anchorage design in moderate to high seismic zone (ACI 318-08 SDC>=C and CSA A23.3-04 R2010 IEFaSa(0.2)>=0.35) ductile anchor design is mandatory as specified in ACI 318-08 D.3.3.4 and CSA A23.3-04 R2010 D.4.3.6. Hoermann-Gast, A. Checks cast-in-place and post-installed anchors. In addition to installer certification, inspection is an important requirement required in ACI 318-11. ACI 318-11 requires that "Anchors shall be installed … This policy establishes parameters for allowable applications of post-installed adhesive anchors in concrete. Neal S. Anderson, P.E., S.E., is a Staff Consultant at Simpson Gumpertz & Heger Inc. in their new Chicago office. Similarly, adhesives used in ACI 318-11 (2011) anchor designs must be qualified in accordance with the ACI 355.4-11 standard (ACI 355 2011). The tests determine if the anchors qualify as post installed anchors in ACI 318 Appendix D (Chapter 17). Concrete anchor qualification results in technical approvals forming the basis for a code‐compliant design. Incorporates provisions of ACI 318-14, ACI 318-11, ACI 318-08 and ACI 318-05. Reprinting or other use of these materials without express permission of NCSEA is prohibited. Currently, screw anchors fall outside the scope of ACI 318 Anchoring to Concrete, but will be studied for inclusion during the next code cycle. under the provisions of ACI 318. Drill and Bond Dowels (Chemical Adhesive) are designated as post-installed adhesive anchors per AASHTO-CA BDS and ACI 318-14. for post‐installed anchors or for anchors designed using strength design provisions, e.g., of ACI 318. Supports the 2015 IBC, 2012 IBC, 2009 IBC and the 2006 IBC. Post-installed anchors used to be outside the scope of anchor design provisions in legacy model codes. (2011), “Anchor Provisions Undergo Significant Changes in the 2012 International Building Code,” Concrete International, American Concrete Institute, Farmington Hills, Michigan, September, pp. The next code cycle will contemplate further additions and layout reorganization. Experience STRUCTURE magazine at its best! 31-33. International Code Council – ICC (2012), 2012 International Building Code (IBC), Washington, DC, 2011, 722 pp. 1. Types of anchors. Research testing of screw anchors has shown that failure can occur in tension via three modes: steel failure, concrete breakout failure, and pullout failure. It covers cast-in-situ anchors and mechanical post-installed anchors. Based partially on the Boston Big Dig tunnel accident, the adhesive anchor installer must be certified to install anchors in certain orientations and under certain load conditions. This paper outlines the general approach of a new appendix for design of anchoring to concrete in the American Concrete Institute (ACI) Building Code. (2012), “Basis for Design of Screw Anchors in Concrete,” ACI Structural Journal, Vol. StruBIM Anchors ACI 318 is a program to check anchors used in concrete elements based on the ACI code (ACI 318-11 Appendix D or ACI 318-14 Article 17). 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