Boussinesq's Point Load Formula - Central to Point of Interest

More Cases

Point of Interest Directly Below Point Load

Notation and Units

Metric and Imperial Units

The above formulas may be used with both imperial and metric units. As with all calculations care must be taken to keep consistent units throughout with examples of units which should be adopted listed below:


  • IB = Boussinesq stress co-efficient
  • P = total concentrated load, kip or kN
  • z = vertical distance from load to point of interest, ft or m
  • ∆σ = stress increase at point of interest, kip/ft2 or kPa