RM-Set (DIAGRAM) > Info/Modification

RM Sets of this type are used as an input for plotting pushover diagrams and saving results for response quantities (actions PushOver and PushOverD).

Force, displacement, and reactions can be selected under component to be assigned to a different element/node or spring in the bridge. User need to define RM-Set PushOver as an input for calculating demand capacity and presenting results. User controls input for plotting pushover demand diagrams in general settings. Also, input data for EC N2 method, FEMA 440 Displacement Modification, and FEMA 440 Equivalent Linearization procedures can be defined in RM-Set PushOver dialog.

Diagram

Setting

Description

PushOver Diagrams

Click "New" to add new diagram. Multiple diagram can be created. Selected diagram can be removed by clicking on Delete button.

Setting	Description
Component	Force, Displacement, and Reactions can be selected and assign to selected axis.
Elem/Node	Element and node (single or series) can be selected and assign to axis component.
Position	Begin or End of Element or both can be selected.
Variable Table	The name of the variable if specified is used to write the diagram output to the table.
Insert Before/After	Selected component and Element/Node for each axis can be added to top table by selecting Insert Before/After. Each axis can be edited or removed by Modify or Delete buttons.

PushOver

Setting

Description

General Settings

Setting	Description
Capacity name	The capacity name refers to the variable table which stores the displacement vs capacity output from Pushover analysis.
SDOF mass	This is mass of equivalent SDOF system determined as a product of mass times shape function as selected in the PushoverD action dialog. This value is automatically calculated during the Pushover action when (Mass/Modal file) and (Mode/Phi=1/Phi=f) information is provided. The user can also override this calculated value.
Transf. Fact. Gamma	The transformation factor is the ratio of SDOF mass and phi * m * phi(T), where phi is the shape function selected in the PushoverD action. This is also known as modal mass participation factor and its value is automatically calculated during the Pushover action when (Mass/Modal file) and (Model/Phi=1/Phi=f) information is provided. The user can also override this calculated value.
Phi function	Phi function is a variable table specifying nodal displacements at various nodes on the structure.
Control node	The control node is the point of maximum displacement on the structure at which displacement is monitored. The control node specification is required for both Displacement control analysis and also for SDOF mass, Trans. Fact calculation.
Direction	X(1), Y(2), and Z(3)
Target displacement	Insert the value for target displacement (unit inch or mm based on selected project unit in project setting). The target displacement specification is only required for Displacement control analysis.
Tolerance	This is the tolerance for performance point displacement calculation.

EC 8: N2 Method

Setting	Description
Tc	Transition period (sec).
Initial displacement	This is the initial hint for starting the iteration for performance point displacement calculation.
Initial period	This is the initial hint for starting the iteration for performance point displacement calculation. The initial period is used to find the corresponding elastic displacement as the starting point for iteration.

FEMA 440: Displacement Modification

Setting	Description
Tc	Transition period (sec).
Lambda Factor	The factor for near/far field effect.
Site class	Site class A, B, C, D, E, or F can be selected.
Overwrite C0	This is equal to the transformation factor automatically calculated by the program. The user can also override this calculated value.
Overwrite C1	This is the modification factor to relate expected maximum inelastic displacements to displacements calculated for linear elastic response. It is automatically calculated but user can also override this value.
Overwrite C2	This is the modification factor to represent the effect of hysteresis shape (pinching, stiffness degradation, and strength deterioration) on the maximum displacement response. It is automatically calculated but user can also override this value.

FEMA 440: Equivalent Linearization

Setting	Description
Damping factor xi (%)	The reference to the damping variable used in generation of response spectra table. The program internally refers to this variable to reduce the response spectra for various damping ratios.
Hysteretic type	The hysteretic type selection depends on the type of behavior expected from the structure. The program provides four options: (1) Bilinear hysteretic, (2) Stiffness degrading, (3) Strength degrading, and (4) General.
Procedure	Procedure A (direct iteration) or Procedure B (Intersection with MADRS) can be selected.