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Cast-in-place headed bolts and headed studs are generic products that can be used directly with Appendix D provisions. However, post-installed anchors must be qualified for use with the provisions of Appendix D due to the inherent diversity of adhesive and mechanical anchor products.
For example, hybrid adhesives have different performance and behavioral characteristics versus epoxy adhesives.
Likewise, epoxy adhesives can vary widely in performance due to differences in their chemical makeup, and in their installation requirements. Given the wide array of post-installed anchor types and performance characteristics, ACI developed two standards to qualify these anchors for use with the Anchoring to Concrete provisions in the ACI code. ACI AC and AC contain programs to evaluate an anchor system for recognition under an IBC version adopted by a local jurisdiction.
There are changes with respect to the information contained in these reports compared to reports having recognition under previous versions of the IBC. This article explains what changes have been implemented into IBC-compliant adhesive anchor ESRs, and how these changes affect adhesive anchor design. The primary test programs for evaluating adhesive anchor systems in cracked and uncracked concrete are given in its Tables 3. AC evaluation of adhesive anchor systems for design using threaded rods, internally threaded inserts and torque-controlled elements include various types of tests:.
However, since ACI Appendix D did not include provisions for adhesive anchor systems, AC was a stand-alone document that included a section titled 3. Part D. With the development of ACI The significance of this is that the inclusion of adhesive anchor qualification and design provisions into the ACI code has resulted in bond strength equations no longer being necessary in either AC, or in adhesive anchor ESRs. Although the ACI The D. The calculations for nominal bond strength per the original version of AC, i.
The ESR bond strength tables include a footnote that defines the concrete temperature ranges for which the adhesive has been tested. Reference each ESR for changes specific to a particular adhesive anchor system.
Besides the 0. The 0. ACI Appendix D now includes provisions for calculating the nominal bond strength of adhesive anchor systems in Part D. The original AC included provisions for calculating nominal bond strength since no provisions were available in Appendix D. AC has been harmonized with ACI Revised bond strength calculations are now based on the projected distance from an anchor instead of the spacing between anchors.
Richard T. Sep, By Richard T. Morgan, P. In Articles , Codes and Standards Comments 0. AC evaluation of adhesive anchor systems for design using threaded rods, internally threaded inserts and torque-controlled elements include various types of tests: reference tests establish the baseline bond strength of the adhesive reliability tests determine sensitivity to installation and load conditions service condition tests evaluate concrete conditions during the service life of the anchor, establish minimum spacing and edge distance requirements, and evaluate performance in simulated seismic conditions.
Figure 1. AC original projected distance parameter. Figure 2. ACI Appendix D projected distance parameter. Figure 3. No Comments. Leave a Comment Click here to cancel reply. First Name Last Name. Email Website. Your message Submit Comment. Download this article.
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