critical edge distance vs min edge distance

Hi Emad,

PROFIS Engineering has two options available for the evaluation of reinforced concrete:

1. Supplementary Reinforcement: For post-installed and cast-in-place anchors, supplementary reinforcement will not transfer the load to the concrete member but will help to restrain concrete breakout, per the ACI 318-14 Anchoring-to-Concrete provisions. If utilizing this feature, Condition A and Condition B can be chosen for Tension and Shear, which will modify the f-factor and y_cp,N (or y_cp,Na) used in the concrete breakout calculation. In PROFIS Engineering, the use of supplementary reinforcement will not modify the pullout or pryout capacity calculations; this is not defined in ACI 318-14 Anchoring-to-Concrete provisions. For more information, please reference page 49-50 in the PROFIS Anchor Design Guide here.
2. Anchor Reinforcement: For cast-in-place anchors, PROFIS Engineering allows the user to select anchor reinforcement in tension and/or shear to prevent concrete breakout, thus stating that the concrete breakout utilization is 0%. This feature will not be available for post-installed anchors due to the complexity of trying to properly place the anchor in the reinforcement, as discussed in ACI 318-14 Anchoring-to-Concrete provisions. For post-installed anchors, the engineer on the project can use engineering judgment to decide to ignore the concrete breakout calculation based on their knowledge of the reinforced concrete member.

Regards,
Paris

Jahja,

The critical edge distance (cac) is defined as the critical distance required to develop the basic strength as controlled by concrete breakout or bond of a post-installed anchor. On the other hand, the minimum edge distance (cmin) is defined as the minimum distance from the center of an anchor to a free-edge of the base material based on testing requirements of ACI 355.2/355.4. 

At the critical edge distance, there will not be an expected reduction in capacity as it is far enough away from the edge to not see any reductions; while at the minimum edge distance there will be a reduction in capacity. 

Let us know if you have any additional questions.

Regards,

Bryan