Methods of calculation (Settlement)

The description of the methods of calculation is not in detail describing the steps of the calculation, but are instead intended to give information about how the calculation results are achieved.
The calculations are mainly based on the book Plattgrundläggning [2].

The settlement calculation is performed according to [2] 2.6 and 3.53. One prerequisite for the settlement calculation to be performed as it is described below is that according to [1] the design capacity in the ultimate limit state only 50% is used . In other case creep deformations needs to be taken into account, see [2] 3.53.

For cohesionless soil the calculation can be performed on the basis of CPT investigation (swe: spetstrycksondering) according to [2] 3.53 eq. 3.27a or with regards to estimated modules or dilatometer tests according to [2] 3.53 equation 3.29.For settlement calculations of small slabs relative to the soil depth should the module of elasticity E that includes Poisson effects, while the method with compression module M should be used otherwise. γ_Rd should be chosen in a range between 1,0 and 1,3.

For cohesive soil the settlement is calculated with regards to the soil properties from ödometer test according to [2] 2.67 and γ_Rd should be chosen between 1,0 - 1,2.

With regards to medium soil the calculation is based on estimated modules or dilatometer tests according to [2] 3.53 equation 3.29. For settlement calculations of small slabs relative to the soil depth should the module of elasticity E that includes Poisson effects, while the method with compression module M should be used otherwise. γ_Rd should be chosen in a range between 1,2 and 1,5.

In the selection of partial coefficients γ_m, the national annex should be taken into account.

 A guide to deciding the partial coefficients is presented in the outdated Boverkets Regelsamling för konstruktion, BKR 2010, 4:31 table a and b.