I cannot believe that there would be concrete break out using M24 anchors in this situation. There is over 1m of edge distance on both sides.
Also surely edge distance is irrelevant when no loading in the other direction. It seems to have large influence on anchor resistance. Based on this calcualtion I would need to have 3m squre bases on any vehicle barrier post
Thank you for your question EC 2 Part 4 section 6.2.2.2 requires you to prove under a shear load condition the capacity of the edge distance if the edge C1 is less than 10 x hef or 60 x dnom . Now in this example you are close to a solution just 9% overstress options .You have options available such as checking if the structure has existing reinforcement and whether that is straight and closely spaced.
If not yet cast, you could consider using supplementary reinforcement to deal with the shear load or look at a different diameter. Alternatively, if you can demonstrate that particular mode of failure will not occur, of course, you are at liberty to make engineering judgement and select that dimension as being fully restrained. i.e., infinity.
Finally of course, you could address if the load is conservative or not.
Hi thanks for the follow up , Yes you would take into consideration the other edge(s) as they would have an effect on the available area of concrete to resist the load . I've attached a screen shot image the yellow lines are your slab edges to the side of your baseplate the area to the outside of them if modelled will reduce and thus the capacity of the loaded edge would be reduced resulting in a smaller edge resistance.
