We have a Concrete beam of 180 mm thickness. We are anchoring the lift shaft to the concrete beam. We have anchor struts on both sides of the concrete beam. Drawing is attached. We have planned to use HSL4B -M12 and HUS4-H 12 anchors on left side and right-side anchoring of the beam. The embedment depth of HSL 4B anchors is approx. 80 mm , and for HUS4-H12 anchors is approx 80 mm. (we have the concrete thickness 180mm). so is it possible to place the different anchors types on this 180 mm thick beam? will the anchors have any combination effect on each other? or do we need to use through and through anchor type instead of using two different anchors? and if we wanted to use 2 different anchors, what can be the minimum concrete thickness allowed , without one anchor having influence on another.
Good afternoon,
Thank you for your question.
My answer will not give you a concrete solution, but more or less a reaching hand to come to a solution.
Option 1: calculation with EC 2-4:
If you want to calculate the situation according to EN 1992-4 (EC2-4), you need to follow the formula h_min = h_eff + 2*d (see picture attached). This means you have to reduce the h_eff or mis-align the anchors as shown
Option 2: through and through
You can see the concrete beam as a 180 mm compression zone. With the right torquing moment, you only need to take shear into account. This is not according to EN 1992-4 and we cannot calculate this.
I hope this gives an insight. If there is any follow-up required, please feel free to reach out to us.
Kind regards,
Team Technical Engineering
NLTeamTechnischAdvies@hilti.com
