Rebar Knowledge Center Overview of Post-Installed Reinforcing Bar Design

OVERVIEW OF POST-INSTALLED REINFORCING BAR DESIGN
What you need to know to design with post-installed rebar.
The methodology for designing post-installed reinforcing bars using the development and splice
provisions of ACI 318 is different than the methodology for designing post-installed reinforcing bars using
the anchoring-to-concrete provisions of ACI 318. Let’s break it down.
Using post-installed reinforcing bars with an adhesive system is a common design and construction
application. Recent revisions to the ICC-ES Acceptance Criteria for Post-Installed Adhesive Anchors in
Concrete Elements (AC308) have made it possible for an adhesive system to be approved for postinstalling reinforcing bars per the development and splice provisions of the American Concrete Institute
Building Code Requirements for Structural Concrete (ACI 318). Therefore, adhesive systems qualified
per the provisions of AC308 can now be used to design post-installed reinforcing bars per the anchoringto-concrete provisions of ACI 318 and per the development and splice provisions of ACI 318. The test
program outlined in Table 3.8 of AC308 includes assessment of an adhesive system when reinforcing
bars are post-installed to an embedment as deep as 60d anchor . That’s deep enough to develop the bar!
Adhesive systems qualified per AC308 receive recognition under the IBC in an ICC-ES evaluation service
report (ESR).
To learn more about the significance of the new post-installed reinforcing bar provisions of AC308, view
the STRUCTURE magazine article, “Post-Installed Reinforcement Design Using Adhesive Anchor
Systems” written by Hilti’s Richard Morgan.
Adhesive systems that have been tested per Table 3.8 of AC308 and received recognition via an ICC-ES
evaluation report are verified as being compliant with the development and splice provisions of ACI 318 to
design post-installed reinforcing bars. View ICC-ES, City of Los Angeles (COLA) and LEED adhesive
anchor approvals for the US and Canada.
As a further design aide, the Hilti North America Post-Installed Reinforcing Bar Guide is a comprehensive
technical reference that explains post-installed rebar theory, design and installation. It includes design
examples and sample specifications to assist you with understanding post-installed rebar design and
applications. Reference the Post-Installed Reinforcing Bar Guide for additional information.