Leaderboard

Bo at the edge and corner is different moreover there are 2 more formulas if punching for corner and edge columns. If you consider this then see result

Depends if the sheet is correct? Does the sheet take into account moments?

What kind of machine is that ? Would the operation of machine induce any dynamic forces in the foundation ? If yes, then pile design is a total different story. The static design of pile is easy. Depending upon what kind of pile you select (friction, end bearing) Consider your pile cap as rigid plate and find reactions at pile locations and design. Thanks.

Vertical resistance of piles will depend on soil conditions; insure enough skin friction, or bearing capacity at bottom of pile according to external vertical forces. In case of machine loading, you will also need to provide for ability to shear and bending stresses. Check for punching shear in pile cap. Check out this book for guidance. https://www.dropbox.com/s/v5ffxjcq4jyqcpt/Pile%20Foundation%20Analysis%20and%20Design_H%5B1%5D.%20G.%20Poulos%20%26%20E.%20H.%20Davis_1980.pdf