CRACKING THE CODE – IBC
Anchoring-to-concrete provisions of the 2012 IBC code
Changes to Adhesive Anchor System Design Requirements
Prior to ACI 318-11, the anchoring-to-concrete provisions in Appendix D did not include adhesive anchor
systems. Instead, provisions for testing, evaluation and design of adhesive anchor systems were given in
the ICC-ES Acceptance Criteria AC308. Beginning with ACI 318-11, adhesive anchor systems were
included into the anchoring-to-concrete provisions of the ACI 318 code. Adhesive anchor provisions are
now given in ACI 318-11 Part D.5.5 and ACI 318-14 Section 17.4.5. The provisions and equations for
calculating bond strength formerly given in AC308 have been removed, and now the only provisions and
equations for calculating bond strength are given in the ACI 318 anchoring-to-concrete provisions.
Changes to Characteristic Bond Strength Values
Beginning with adhesive anchor ICC-ES Evaluation Service Reports (ESRs) having 2012 IBC recognition,
the characteristic bond strength values (τk) that are given in the tables containing “BOND STRENGTH
DESIGN INFORMATION” have been revised from the values shown in previous ESRs. Testing per the
American Concrete Institute test standard ACI 355.4 and the International Code Council-Evaluation
Service Acceptance Criteria AC308 now requires the maximum short-term/maximum long-term concrete
temperatures for “Temperature Range A” to be 130°F/110°F, respectively. These temperatures have
been increased from the previous “Temperature Range A” maximum short-term/maximum long-term
temperatures of 110°F/80°F, respectively. The characteristic bond strength values (τk) based on these
temperatures can therefore be lower than values published in previous ESRs.
Adhesive Anchor Design
Beginning with adhesive systems having recognition under the 2012 IBC, bond strength calculations will
be performed using the anchoring-to-concrete provisions given in ACI 318. The ACI 318 provisions are
used in conjunction with the provisions and tables contained in the adhesive anchor ESR. The
characteristic bond strength values (τk) that are given in the tables containing “BOND STRENGTH
DESIGN INFORMATION” have been revised from the values shown in previous ESR versions. The
maximum short-term/maximum long-term concrete temperatures for “Temperature Range A” have been
increased to 1300 F/1100 F, respectively. The characteristic bond strength values (τk) based on these
temperatures are typically lower compared to values shown in previous ESR versions. PROFIS Anchor
uses these revised bond strength values to perform bond strength calculations when ACI 318-14, ACI
318-11 and ACI 318-08 have been selected as a design option. PROFIS Anchor also uses the ACI 31811 D.5.5 provisions to perform bond strength calculations when ACI 318-08 has been selected as a
design option because the AC308 bond strength provisions formerly used are not compliant with
jurisdictions and projects using the 2012-and-later IBC. In order to maintain the most current version of
PROFIS Anchor on your computer, with the most current ESRs, please remember to update when
prompted by the AutoUpdate notification. Note: you must be connected to the internet.
View all current approvals and reports for Hilti mechanical and adhesive anchor products in the US and
Canada.
Hilti offers best in-class design software, PROFIS Anchor, to assist you when designing with the anchoring
provisions of ACI 318 and CSA A23.3. The software is a comprehensive and intuitive tool that performs
calculations per the anchoring provisions of ACI 318-08 and ACI 318-11 Appendix D, ACI 318-14 Chapter
17, ACI 349-01 Appendix B, and CSA A23.3-14 Annex D and produces a design report with the
calculations and 3D schematic of the anchor design. Give your next project the power Hilti codecompliant anchors by adding our complimentary PROFIS Anchor software to your toolbox.
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