I have an application where I want to secure vibrating equipment and I want to use a product which is resistant to fatigue. I am considering HIT-RE 500 V4.
A limitation is that the bolt holes provided on the equipment are 20mm diameter, and I want no more that 2mm oversize of the holes, requiring an 18mm anchor. The HAS anchors are not provided in 18mm diameter, therefore I am considering specifying generic 18mm galvanised threaded rod grouted with HIT-RE 500 V4.
Within the PROFIS catalogue, HIT-RE 500 V4 is only rated for fatigue design with HAS rod. The fatigue symbol is greyed out for the other applications (see image attached).
My questions:
What is it about the HAS rod that makes HIT-RE 500 V4 + HAS rod suitable for fatigue applications, but HIT-RE 500 V4 + Rebar, HAS Meter or HIS not suitable? Is it only the steel or is there an aspect of the interface with the concrete?
Are you able to identify any fatigue issues with specifying generic 18mm galvanised threaded rod grouted with HIT-RE 500 V4 that are not purely related to the fatigue performance of the steel?
Thanks
Hi Dave,
Thank you for reaching out to Hilti.
The calculations available on Profis are always according to the approvals that our solutions went through. Specifically for this fatigue approval, RE 500 V4 was tested with Hilti HAS-U A4 rods on the sizes M8, M10, M12, M16, M20 and M24 as per the ETA-23/0277 following the European Assessment Document (EAD) 330250-01-0601 for design according to EOTA TR 061. You can access the ETA >> here. And the EOTA TR 061 >> here for more information on the design method.
It's important to highlight that the results in the approvals consider the anchors as a complete system, including not only the chemical's performance, but also the interaction with the steel and the concrete.
That being said, you can find the specifications and properties of the HAS-U rods used in the testing, on table A1 of the ETA (annex A4, page 9).
For your specific application, where you'd need a rod size that is outside of the anchor's fatigue approval, the recommendation would be reaching out to our technical support team (fill the form here) with specific information of your design so they can check the possibility of working on an Engineering Judgement with our anchor experts.
I hope the above is helpful, but please reply if you need further support.
Kind regards,
Ask Hilti team