genset pad calculation in an existing floor slab

[NOEL13]

i have 3 generator sets with wet weight of 1478kg each. foundation pad is 0.2m x 9.38m x 4.215x respectively. it is installed in genset room at 3rd floor of a building with 4000psi slab density. do you have any equation for genset foundation design, when the foundation is to be installed in an existing floor slab? or how can i calculate if the genset pad is safe in that 4000 psi slab. thank you. hoping for your response mate!

 

[NOEL13]

here is attached formula for mechanical books. i dont know if its applicable in a existing floor slab like i said. thank you.

https://files.engineering.com/getfi...864babd80ad&file=genset_foundation_design.pdf