Is your library lacking in design examples for anchors in concrete? Are you familiar with the code-required inspections and certifications for concrete anchors? Designing anchors in concrete can be complex and time-consuming if done by hand. Given the ever-increasing utility and flexibility of post-installed anchors, having the best resources on your bookshelf can ensure all failure modes are considered, all specifications are clear, and inspection requirements are met.
In the September 2018 SE University session, Donald Meinheit, PE, SE, from Wiss, Janney, Elstner Associates, Inc., concluded a two-part series by presenting Anchors: Design Examples and Qualification/Certification/Inspection. Don reviewed code applications to design problems and why qualification standards exist. He also identified code requirements for installation and inspection certification, and referenced recommended compliance testing.
When designing anchors in concrete, using the most recent guidelines is essential, since the topic is rather new, relatively speaking. Don referenced the most common publications offering guidance on the design of anchors in concrete. Typically, engineers have relied heavily on Chapter 17 in ACI 318 as the primary design reference for anchors, but other important documents include ACI 355.2-07 Qualification of Post-Installed Mechanical Anchors in Concrete and Commentary and ACI 355.4-11 Qualification of Post-Installed Adhesive Anchors in Concrete. These additional resources from ACI are similar to ASTM standards.
ACI also has several publications for purchase which include worked out design examples pertinent to anchors in concrete which include The Reinforced Concrete Design Handbook SP-17 Volume 2, ACI 355.3R-11 Guide for Design of Anchorage to Concrete: Examples Using ACI 318 Appendix D, and ACI 349.2R-14 Guide to the Concrete Capacity Design (CCD) Method – Embedment Design Examples. These combined documents offer over 40 unique examples, not found in other texts, which can guide the engineer through various anchor designs. ACI 349.2R-14 provides solutions for a ductile anchor design for use in nuclear structures.
Don also referenced the CRSI Technical Note CTN-M-3-11 Suggested General Drawing Notes for Adhesive Anchors which was published in 2011 to assist design engineers in coordinating the adhesive anchor design into cohesive construction and installation requirements for the design drawings. Also, the Concrete Anchor Manufacturer Association published Special Inspection Guidelines for Post-Installed Anchors. Both of these documents are available as a free download by clicking on the links above.
Be sure to have these resources on hand for the next time concrete anchors are used on one of your projects. Using the most recent guidelines is essential to meet the code requirements for strength, as well as for installation and inspection.