# Pushover Case \[SPIG]

## Control

**Stage:** Specify a stage for which the pushover analysis will be conducted.

**Bridge:** Specify the bridge model that will be analyzed.

**Max # of Steps:** Specify the maximum number of steps for the pushover case analysis.

**Initial Load Factor:** Specify the initial load factor to be used in the pushover analysis.

**Load Factor Increment:** Specify the load factor increment to be used in the pushover analysis. allowing for a gradual increase in lateral loads during the analysis.

**Active \[YES/NO]:** For these definitions to be used for the pushover analysis, please define this parameter with the option 'YES'; otherwise, the pushover analysis will not be conducted.

## Stopping Criteria

For pushover analysis to determine the structure's capacity based on lateral loads, definitions must be established. By specifying the direction along the axes, boundary conditions for displacement/rotation can be defined. When the specified values are reached, the pushover analysis will be halted. Users should also be aware that the definitions made will be taken into account based on the alignment's coordinate systems. The intention behind stopping the pushover analysis is to prevent the increase of lateral loads, thereby enabling the determination of the bridge's lateral load capacity based on the corresponding displacement or rotation.

**Direction \[Tx/Ty/Tz/Rx/Ry/Rz]:** The direction for pushover analysis can be defined with the following options:

* **Tx/Ty/Tz:** Translation along the axes. If these are used, displacement can be specified.
* **Rx/Ry/Rz:** Rotation along the axes. If these are used, rotation can be specified.

**Displacement:** If the direction is specified with translation along the axes X/Y/Z (Tx, Ty, Tz), the displacement can be specified. However, if the rotation along the axes (Rx, Ry, Rz) is used for the definition of the direction parameter, this parameter will not be applicable

**Rotation:** If the direction is specified with rotation along the axes X/Y/Z (Rx,Ry,Rz), the rotation angle can be specified. However, if the translation along the axes (Tx,Ty,Tz) is used for the definition of the direction parameter, this parameter will not be applicable.

## Nonlinear

**Iterations:** This refers to the number of iterations the analysis will perform during the pushover procedure and can be defined using this parameter. Each iteration represents a step in the analysis process where the load is incrementally applied to the structure. A higher number of iterations allows for a more refined and detailed response analysis, as it can better capture the gradual progression of the structure's nonlinear behavior.

**Force Tolerance:** This parameter can be used to specify the allowable difference in force before the analysis considers the results as converged. In practical terms, it indicates how closely the applied forces must match the expected forces during the iterations. For example, a smaller tolerance may lead to more accurate results but could also increase computation time.

## Referencing Objects

**Pushover Load:** Pushover Load objects that reference this analysis case. (Read-only)


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