Post-Installed Reinforcing in Fire Conditions 2023
POST-INSTALLED REBAR DESIGN FOR DEVELOPMENT LENGTH FIRE EXPOSURE
Figure 5 below shows the effects of temperature on the HIT-FP 700R adhesive when exposed to a fire condition when used for development of rebar for either ACI or CSA code provisions . After determining the equivalent bond stress for the ambient temperature , t equiv
, as noted in Section 2.1 of this document , then calculate the bond stress in the fire exposure condition , t fire ( θ ) using the equations from Figure 5 . The development length in the fire exposure condition , l d , fire , will then be as follows : l d , fire = t equiv
∙ l d t fire ( θ )
The final development length used would be the maximum of l d , or l d , fire
. See Section 2 of this document for more information on the design in fire exposure conditions .
Figure 5 — Hilti HIT-FP 700 R bond stress vs . temperature of post-installed rebar applications , short term loads and sustained loads , not-including seismic
May 2023
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