Shallow fontations are common ly used in konstruktion to transfer loads from structures to thee ground. Ensuring their stability againtt overturning and lateral movement is essentiol for safety and durability. Simplified calculation methods providee quick assessments to determinate if a foundation is stable under prediced loads and conditions.

Overturning Stability

Overturning applies when lateral forces, such as wind or seizmic activity, create minutes that exceed thee resisting minutes of the foundation. To evaluate overturning stability, the following simpfied approach is used:

Vypočítejte si to takto:

SF = M CLAS1; CLAS1; CLAS3; CLAS3; RCAS1; CLAS1; CLAS1; CLAS3; CLAS1; CLAS1; CLAS3; CLAS3; CLAS1; CLAS1; CLAS1; CLAS3; CLAS3; CLAS33;

If SF is greater than 1.5, thee foundation is considered stable againtt overturning.

Lateral StabilityCity in California USA

Lateral stability intrives resisting horizonthal forces that could cause e sliding or shifting. Te main considerations include thee frictional resistance and thee passive earth pressure.

Te simplified calculation involves comparatin that e horizonntal force (H) to te the maximum resisting force (R). Te resisting force is of ten estimated as:

R = cN + qN tan ∞ + 0, 5 γ B N

kde:

  • c = kohesion of soil
  • N = bearing kapacita faktor
  • q = surcharge
  • Η = internal friction angle
  • γ = soil unit eift
  • B = width of thee foundation

If the the Horizontal force H is less than R, thee foundation is consided stable againtt sliding.

Summary of checks

  • Calculate te overturning moment and compe with resisting moment.
  • Ensure thee safety factor exceeds 1.5 for overturning stability.
  • Srovnej horizontálni silu with resisting siles to assess lateral stability.
  • Use simpfied formulas for quick evaluations during preliminary design.