Solver settings

This settings dialogue provides for adjustment of basic parameters controlling the calculation.

The solver settings can be opened in two ways: either via "Main menu > Tools > Calculation & Mesh > Solver settings", or in the dialog "FE analysis" just before the calculation is executed..

Parameters in the solver settings are divided into several groups according analysis type (Nonlinearity, Dynamics,...), or as parameters for special functionality (Soil,...).

Solver settings groups of parameters

- General

This group of parameters is available for all type of calculations in the project.

There is only limitation in "type of structure" in "project data" dialog where there is no settings for slabs in for example project type "frame".

Parameters for this group

• Neglect shear force deformation

• Neglect shear center eccentricity

• Bending theory of plate/shell analysis

• Type of solver

• Number of sections on average member

• Warning when maximal translation is greater than

• Warning when maximal rotation is greater than

More information about these parameters is here : " General calculation parameters"

- Effective width of plate ribs

This group of parameters is available for all type of calculations in the project.

There is only limitation in "type of structure" in "project data" dialog where there is no settings for slabs in for example project type "frame".

Parameters for this group

• Number of thickness of rib plate

Parameters in subgroup "Detection of adjacent beam / edge"

• Parallelism tolerance [deg]

Parameters in subgroup "Concrete beams (automatic calculation acc. EN 1992-1-1 art. 5.3.2.1)"

• Ratio to half-distance to adjacent beam beff,i/bi

• Ratio to effective span length beff,i/l0

• Max ratio to effective span length beff,i/l0

Parameters in subgroup "Effective span length ratio l0/li (fig. 5.2)"

- Simply supported beam

- Inner span

- End span

- Cantilever, base ratio to current span

- Cantilever, base ratio to adjacent span

- Cantilever, max ratio to current span

Parameters in subgroup "Applicability tolerances"

- Max adjacent span length ratio

- Max cantilever length ratio to adjacent span

Parameters in subgroup "Steel/Composite beams (automatic calculation acc. EN 1994-1-1 art. 5.4.1.2 and 5.4.2.1)"

• Span length ratio Le/beff,i,max (1 side)

Parameters in subgroup "Effective span length ratio Le/Li (fig. 5.1)"

- Simply supported beam

- Inner span

- End span

- Cantilever

Parameters in subgroup "Other types of beam"

• Method used for non-concrete and non-steel/composite beams

More information about these parameters is here : "Automatic Calculation of the Effective Width of Plate Ribs"

- Nonlinearity

This group of parameters is available only for nonlinear calculation, in the project with some nonlinear functionality and nonlinear combination.

Parameters for this group

• Geometrical nonlinearity

• Method of calculation

• Number of increments

• Maximum iterations

• Solver precision ratio

• Solver robustness ratio

• Plastic hinge code

• Allow compression in membrane members

More information about these parameters is here : " Nonlinear calculation"

- Dynamics

This group of parameters is available only for dynamic calculation, in the project with some dynamic LC and dynamic load.

Parameters for this group

• Type of eigen value solver

• Number of eigenmodes

• Use IRS (Improved Reduced System) method

• Enable advanced modal superposition for seismic load cases

• Method for time history analysis

• Mass components in analysis

Parameters in subgroup "Mass components in analysis"

• Translation along global X axis

• Translation along global Y axis

• Translation along global Z axis

• Rotation around local X axis of 1D members (torsion)

More information about these parameters is here : "Dynamic natural vibration calculation"

- Linear stability

This group of parameters is available only for linear stability calculation, in the project with stability functionality and Stability combination.

Parameters for this group

• Type of eigen value solver

• Number of critical values

- Nonlinear stability

This group of parameters is available only for nonlinear stability calculation, in the project with some nonlinear and stability functionality and nonlinear stability combination.

Parameters for this group

• Type of eigen value solver

• Number of critical values

• Geometrical nonlinearity

• Method of calculation

• Number of increments

• Maximum iterations

• Solver precision ratio

• Solver robustness ratio

• Plastic hinge code

• Allow compression in membrane members

- Soil

This group of parameters is available only if functionality "Subsoil" is available in the project.

Parameters for this group

• Soil combination

• Maximum soil interaction iterations

• C_1x

• C_1y

• C_1z

• C_2x

• C_2y

• Thickness of loose layer at contact level [m]

• Modify Soilin stiffness parameters for seismic analysis

• Coefficient for horizontal stiffnesses

• Coefficient for vertical stiffness

More information about these parameters is here : "Required parameters for Soil-in calculation"