Action > PushOver

The PushOver action is a non-linear calculation action using a load-stepping procedure. e.g. the load is applied on the structure in steps. Action performs the calculation of capacity of the structure in Pushover analysis. A reference load case containing the definition of load case and RM-Set for plotting the capacity curve must be specified.

When the "Non-linear Material" flag is enabled in the recalculation pad, the analysis is performed for each step with considering non-linearity of the material as defined by the stress-strain diagram (or cracking of concrete and developing strains in reinforcement respectively). This procedure allows for automatic detection of the formation of plastic hinges if the element subdivision is reasonable. Geometric non-linearity is considered in accordance with the respective settings in the recalculation pad.

The reference load case defines constant initial load and the maximum variable load subjected on the structure. Each load case can include different load sets. The checkbox Load set can be increased marks loads which are gradually increased in the pushover action, the other loads are considered as constant throughout the stepping scheme. When one of the schedule options Accumulate Stiffness or Erection Control is selected, the initial state includes also the stressing state stored in the summation load case.

Setting	Description
Action	Code of the selected Action. It is possible to switch to another action without leaving and re-entering the input function.
Action will be skipped (Option)	The action will be skipped in the calculation process if the option is selected.
Input-1 > Reference Loadcase	Name of the load case to be calculated.
Input-1 > (Mass/Modal file)	Name of the Mass/Modal file for calculation of single degree of freedom mass and lateral load pattern.
Input-1 > (Mode/Phi=1/Phi=f)	This input defines one of the following three quantities which is used for shape function: (1) Mode no for mode shape, (2) Unity for unit displacement at all nodes, and (3) Phi=f which is variable table defined in Diagram RM-Set.
Input-2 > Number of steps	This defines the number of stepping for loads or displacement at the control node.
Input-2 > Number of substepst	The sub-stepping option is used for sub-dividing a load step when force-controlled analysis fails to converge.
Input-2 > Type of increment	Force or Displacement control.
Input-3 > RM-Set	This is the Diagram RM-Set where diagrams and other Pushover input is defined.
Input-3 > Material nonlinear analysis	This selection is used when Material nonlinearity option in Recalc pad is not desired to be switched on.
Output-1 > Seismic lateral load set	The name of the lateral load set which is automatically generated by the action and used in the analysis. The automatic load pattern is saved in the seismic lateral load set as defined in the action and when no name is defined then program defaults to a hardcoded name string "lat-perform#". The cases where they are already present they are not overwritten i.e. their factors are not modified.
Output-2 > List File	List file name to list load case results. Note: With the default '*', the name PushOver.lst will be automatically used. If the field remains empty, no list file will be created
Delta-T	Duration of the Action (not applicable for this action)
Description	Descriptive text for the selected Action (max. 80 characters)