The 'Analysis Type' is preset according to the load case category.
Static Analysis
The default setting for the analysis type is 'Static Analysis,' as shown in the following figure.
Static Analysis | Creep and Shrinkage (linear)
With the 'Concrete Design' add-on, the analysis type 'Static Analysis | Creep & Shrinkage (linear)' is available. This analysis type extends Static Analysis by considering creep and shrinkage. Creep and shrinkage are already simulated in the finite element analysis for this purpose. The input of the start and end of loading is required.
Background information on the type of consideration for creep and shrinkage in the mentioned analysis type can be found in chapter Time-Dependent Behavior.
Creep due to constant load off
Specifically for the analysis with linear creep, this option to define the creep-inducing constant load is available. It is highlighted in the following figure.
This allows the creep for the permanently acting part of the current load combination to be calculated, while the remaining load is calculated without considering creep.
From the load combination assigned to this option, the load level is taken to conduct the analysis, considering creep in an initial partial calculation. Then, for the other load components of the current combination that exceed the permanent level and are to be considered as non-creep-inducing, the analysis is continued without creep.
Combination Wizard for Analysis Type and Constant Load
The setting of the analysis type and creep-inducing load can be done manually, as shown in the section above. However, it is also possible to set these settings in the Combination Wizard so that the desired settings are considered in the generation of the combinations.
Analysis Type
In the Combination Wizard, the type of static analysis can be selected in the base register, as shown in the second image of the following image series. If the type "Static Analysis | Creep & Shrinkage (linear)" is set, the additional register "Creep & Shrinkage" appears. It is divided into the input areas for setting the times and the creep-inducing constant load. This is shown in the first image of the subsequently displayed image series.
Creep due to constant load off
If 'Creep due to constant load off' (1) is selected under 'Creep & Shrinkage' in settings, the two options for defining the creep-inducing load become selectable. A specific load case or load combinations (2) can either be set. Alternatively, it is possible to choose a design situation. This assigns the respective load combination of the selected design situation to a combination (3).
When selecting the option "Associated load combination of the design situation," the associated load combinations of the specified design situation are automatically set as the constant load in the generated load combinations. This is exemplified in the following image series for the case that the design situation "BS 4 - SLS - Quasi-permanent" is chosen.
- All load cases generated from the current combination wizard that do not belong to the design situation 4 chosen as the constant load will have the associated load case of design situation 4 set, as exemplified in images 1 and 2.
- For all load cases generated from the current combination wizard that belong to the design situation 4 chosen as the constant load, the option "Creep due to constant load off" is not activated. As these load cases themselves correspond to the permanent load level. This is exemplified by image 3 of the following image series.
If the associated load combinations are not filled in your case, you can activate this by checking the option "Auto-assign associated load combinations" in the Base tab of the input dialog "Load Cases and Combinations." Alternatively, manually associated load combinations can be defined.