I am designing a structural base which consists of a large mass concrete sections, and a thinner reinforced topping. The two sections are connected by post-installed rebars (HIT-HY 200-A V3 resin) which in the ultimate limit state are subject to direct tension loads only. I am uncertain whether I can consider these as an EN 1992-1-1 anchorage check (with PIR factor on the bond strength) or if I have to consider the EN 1992-4 approach? The EN 1992-4 approach is more onerous for steel failure due to the significantly larger partial factor (1.4).
If I have two bars closely spaced I presume I will have to adopt the EN 1992-4 approach to accurately assess the influence the bars have on each other.
Thanks for the question. I would consider modelling this as a potential overlay connection within the Profis Engineering software and the Concrete Overlay module. In the module you have options available such as Slab strengthening, Generic shear friction interface (This is the one I would have a look at initially) Beam strengthening and Wall strengthening.
As mentioned, the Generic allows for a 1mtr square area of concrete, and you can input your existing details and your new layer values. You have a choice of resin or mechanical anchors depending upon your load i.e. static, seismic or fatigue.
There is also a recorded CPD online seminar from April 2025 that you can watch regarding this topic in the ‘Learn section’ under ‘Past Sessions’ for more information in the Engineering Centre.