The pushover analysis is based on a load combination to which the pushover analysis analysis type is assigned.
Base
In the Basic tab, you can assign the analysis types and define additional parameters. To do this, select the load combination on the left in the ' list '.
Categories
The basic settings for the pushover analysis of the load combination must be made in this section.
Analysis Type
If the add-on 'Pushover' is activated in the model basic data, the pushover analysis can be selected from the list. Assign this analysis type to a load combination for which you want to perform a pushover analysis. It is recommended to create a user-defined load combination here.
Static Analysis Settings
In the list of structural analysis settings , specify the analysis type according to which the pushover load combination is calculated should.
Pushover Analysis Settings
In the list of 'Pushover Analysis Settings' ( PA ), select the specifications according to which the load combination is to be examined. These are, for example, the specifications for the load increase, the termination conditions and the accuracy for the calculation of the target displacement. These parameters are described in chapter Pushover Analysis Settings .
Use the
button to add new pushover analysis settings, and the
button to edit the selected setting.
Constant vertical (gravity) loads from load case / load combination
Define the load case or load combination whose loads should be considered constant (immutable) in the pushover analysis. In the list, you can select all load cases and combinations that are examined according to the same structural analysis setting as the pushover load combination. The pushover analysis does not increase this load component.
Horizontal (increasing load) source
In this section, the specifications for the loads acting laterally on the structure are to be met. These loads are increased in the pushover analysis until the demolition criterion is reached or the structure fails.
Direction
In the list, select the global axis in whose direction the loads act.
Modal analysis from load case
In the list of defined modal analysis load cases , specify which eigenvalue analysis should form the basis of the pushover analysis. This modal analysis load case is the prerequisite for the calculation of the masses and the load distribution according to the modal form.
Normalized displacements
The following options are available for selection in the list:
- Uniform (1 in earthquake direction, 0 otherwise): The load is applied evenly across the building height at the mass points of the structure. The lateral load is only determined by the mass distribution and is not scaled any further. The horizontal forces are proportional to the masses - regardless of the altitude - and thus correspond to a uniform acceleration response.
- Modal (automatic modal form): The load is scaled by the dominant mode shape and applied in the specified at the mass points of the structure. The horizontal forces are proportional to the masses and heights/eigenmodes.
- Modal (modal form selected by the user): The load is scaled by the mode shape selected by the user and applied in the specified at the mass points of the structure.
Eigenform Φ
This input field is only accessible for a user-specific modal form. Here you can scale the eigenmode by adapting the vector of the normalized displacement Φ.
Response Spectrum
In the Response Spectrum tab, you can assign the response spectrum that is eligible for the pushover analysis.
In the list, select one of the existing response spectra that is to be used for the determination of the target displacement. You can create a new spectrum with the
button, and edit the selected spectrum with the
button.
In contrast to the response spectrum method, the pushover analysis works with the elastic spectrum. The pushover analysis can be used to determine the behavior coefficient q and thus to influence the design spectrum for the response spectrum method.
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Further information on this register can be found in chapter Response spectrum .