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Combination

This window contains properties of a combination of load cases. The input field in front of the combination name shows the content of the combination. This brief description consists of the ID codes of the load cases. Main variable loads are at the beginning and are separated by the colon.

Type

These combinations are available for ultimate limit state:

Basic

  • The fundamental combination according to the formula (6.10) of EN 1990

Alternative

  • The combinations according to the formulas (6.10a) and (6.10a) of EN 1990. Two combinations are considered in the analysis for this option. First combination contains reduced permanent load cases, second one contains reduced main variable load.

Accidental

  • The accidental combination according to the formula (6.11) of EN 1990

Following combinations are available for serviceability limit state:

Characteristic

  • The combination according to the formula (6.14) of EN 1990

Frequent

  • The combination according to the formula (6.15) of EN 1990

Quasi-permanent

  • The combination according to the formula (6.16) of EN 1990

Final deformation

  • The combination for the calculation of final deflection for timber structures. These combinations are based on the chapter 2.2.3(5) of EN 1995-1-1. These combinations shows relevant values only for deformations. Internal forces are increased due to creep effect and shouldn't be used for the design.

Selection of load cases

The selection of the load cases included in the combination can be done in the table with the list of load cases. Any load case may be added into the combination using the first check box in the column "Consider". Second check box sets the favourable effect of permanent loads (partial factor γf,inf) and alternatively sets the variable load as a main one in the combination. Number of main variable loads for one combination isn't limited.

The accidental load may be selected for combination type "Accidental". This load case can be selected in the bottom part from the list of entered accidental load cases. Accidental combinations may be entered also without any accidental load case. This option is common for the analysis of fire resistance of the structures. The option "Not specified" in the list of accidental load cases has to be selected in these cases. The combination factor (ψ1 or ψ2) has to be specified for the accidental load:

  • ψ1 - Factor of frequent value of the variable load
  • ψ2 - Factor of quasi-permanent value of the variable load

Selection of load cases

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