2D subsoil - C parameters

The 2D subsoil - C parameters command serves for displaying stiffnesses of soil on selected 2D members with surface support.

Usage

  1. Calculate a FEM analysis of the model
  2. Go to Tree > Results > 2D members > 2D subsoil - C parameters
  3. Set properties of the command to specify mainly:
    • selection of 2D members where the results are evaluated
    • load type from which the results are derived
    • specific result value from the available list to be visualized
  4. Click on [Refresh] action button to display the results

Note: To get general overview about how to work with a Result service and its commands, see Results/Basics.

Properties

Category Property Description / Notes
Selection

Type of selection
All / Current / Advanced / Named Selection

Specifies on what members the results are displayed
See "Type of selection"

 
Filter

No / Material / WildCard / Layer / Thickness
Extreme Location
In centres

Determines way how results - calculated in the nodes of individual finite elements - are further processed (averaged) to get smoother continuous distribution.
See Results/Theory/Smoothing_results

System
LCS mesh element

Sets a coordination system which is used as referenced for displaying the results.
See Results/Theory/Local_axes_2d

Extreme

Mesh / Member / Global

 Defines for which extreme on 2D member the results are displayed.

Value

C1_z / C2_x / C2y / C1_x / C1_y

 See table Values below.
Standard result
On/Off		 Display standard results on 2D members.
Results on sections
On/Off		 Display results on defined sections on 2D members.
Results on edges
On/Off		 Display results on the edges of selected 2D members.
Table setup   Possibility to define columns with values in preview window.
Drawing Setup 2D   "Drawing setup 2D"

Values

Value Description Notes
C1z foundation compression modulus of the Winkler type, expressing resistance to the vertical displacement of the subsoil surface

When the interface between subsoil and foundation lies in a horizontal plane (x,y) and the axis z is vertical, then, according the IASMFE rules, the constants can be named as follows:

C1z - modulus of subgrade reaction

C2x, C2y - moduli of subgrade shear reactions

C1x, C1y - moduli of subgrade friction reactions
C2x foundation shear moduli expressing resistance to shear components in the x direction of the subsoil surface
C2y foundation shear moduli expressing resistance to shear components in the y direction of the subsoil surface
C1x foundation friction moduli expressing the resistance of the subsoil surface to its horizontal displacement components in x direction
C1y foundation friction moduli expressing the resistance of the subsoil surface to its horizontal displacement components in y direction