Edge Reinforcement in PROFIS Engineering

Question

Posted by Arjohn Espinoabout 5 years ago

Asking on behalf of customer,

How does edge reinforcement affect the calculation for concrete breakout in PROFIS Engineering Anchor design? When condition A is selected for both Tension and Shear, the strength reduction factor is changed. However, selecting one of the edge reinforcement options does not change or in any way affect the results. In what way does selecting from the edge reinforcement options (None or < no. 4 bar, ≥ no. 4 bar, ≥ no. 4 bar with stirrups) affect the anchor design?

Thank you very much.

Profis Engineering,edge reinforcement,supplementary reinforcement

REIN.PNG8.6 KB

1 Reply

Posted by Reno Sorianoabout 5 years ago

Hi Arjohn,

Thanks for posting your question on Ask Hilti!

The 1st option of edge reinforcements (None or < no. 4 bar, ≥ no. 4 bar, ≥ no. 4 bar with stirrups) are the natural option to resist the cracking of concrete edges due to the shear loads towards the concrete edge. They surely help to optimize the resistance values against the shear load towards the edge as you increase the number and diameter of the edge reinforcements.

While the next options are considering that there are parallel and/or perpendicular rebars available near the anchoring locations. This will help in resisting the concrete failures in tension breakouts and shear loads. It is similar to creating a cage of rebars around the anchoring locations which can resist the concrete failures in tension and shear. Please refer the image attached just for illustration purpose (as per ETA).

Please find attached a design file where the values of tension and shear resistances vary by selecting all the options as mentioned above.

We hope that we have answered your question and if you have additional question on this topic please continue to post it here.

Regards,

Ask Hilti Team
South East Asia

rebar,supplementary reinforcement,edge

Drafts_Concrete - May 19, 2021.pe17.25 KB

2 comments on this reply

Posted by Reno Sorianoabout 5 years ago

Hi Arjohn, ETAG/EC design standard have adopted the Supplementary Reinforcement design. But ACI is yet to adopt but have taken the factors in design when conditions selected. Please refer the design file that we have provided as example was, it shows the differences when different options selected. If you want we can help you to analyze further your design just send to us your design file so that we can analyse the system behaviour. Thanks! Ask Hilti Team South East Asia

Posted by Arjohn Espinoabout 5 years ago

Thank you very much for the prompt response! Just a clarification, so this only factors in when using ETAG/European Design? I tried selecting from among the 3 options using ACI Calculation but there is no decrease in the utilization for shear and tension concrete breakout.