I am designing the foundation for a vertical storage tank. It's a sizeable tank. I am being asked to design a foundation where the tank is supported directly on the pile cap? I am not sure I understand the function of the pedestal separate from the footing/pile cap. All designs I have done for vertical vessels included an octagonal pedestal with a sqaure or octagonal footing.
Additionally, what is the reason for not extending the anchor bolts into the footing?