Dear Muhammad, I think you sum up the problem of using a single plate very well, nothing to add to that. If you follow the approach under 3) it would seem that it's more accurate as to some degree one takes into account the increase of stiffness with…

Dear Muhammad, I can try to assist here. 1. This is something only you can answer as it involves knowing the project and how you expect your piles to behave. Do you expect any lateral resistance or not? Then, you can understand whether you need to…