Calculation methods


In ELPLA, 9.2 different numerical methods with 3 soil models are considered for analyzing raft foundations as follows:

1)

Linear contact pressure (Simple assumption model)

2)

Constant modulus of subgrade reaction (Winkler's model)

3)

Variable modulus of subgrade reaction (Winkler's model)

4)

Modification of modulus of subgrade reaction by iteration (Winkle's model/ Continuum model)

5)

Modulus of compressibility method for elastic raft on half-space soil medium (Isotopic elastic half-space soil medium - Continuum model)

6)

Modulus of compressibility method for elastic raft on layered soil medium (Solving system of linear equations by iteration) (Layered soil medium - Continuum model)

7)

Modulus of compressibility method for elastic raft on layered soil medium (Solving system of linear equations by elimination) (Layered soil medium - Continuum model)

8)

Modulus of compressibility method for rigid raft (Isotopic elastic half-space soil medium and layered soil medium - Continuum model)

9)

Modulus of compressibility method for flexible raft (Isotopic elastic half-space soil medium and layered soil medium- Continuum model)

Beside the 9 main methods stated above, ELPLA can also be used to analyze system of flexible, elastic or rigid foundations. Furthermore Structural Engineers, ELPLA can be used to analyze many other structural problems such as floor slabs, grids, plane frame and plane stress.