Push Over

 

 

The push over window has three tabs to define the needed data to perform a push over analysis:

• General Data
• Modal Shape
• Curves

 

General Data

 

In the General Data tab the data for the Push Over design is defined:

 

 

 

The parameters needed are:

 

• Disp. Measure point: Point at which the displacements will be measured to define the Push Over curves. It is possible to choose between the node number or the coordinates (CivilFEM will select the nearest node to the desired coordinates).
• LS File: Load State file which includes the defined loads that will be increased by the multiplication factor.
• Lambda: Final value of the multiplication factor.
• SS num: Number of substeps that will be generated. For each substep the load will be increased by .
• Vertical Axis: The vertical axis must be defined (gravity direction).

 

 

Modal Shape

 

To solve the push over analysis the next three simple steps must be followed.

 

1. Load the vibration modes by clicking on Load Modes. It is necessary to perform a modal analysis (apart from defining a response spectrum) before entering the Push Over window.

 

 

 

2. Select principal vibration mode from the list. This will be the mode for which the push over analysis will be performed.

 

 

3.  Click on Solve

 

 

 

Curves

 

 

The capacity spectrum curve and the demand spectrum curve are represented here, as well as the characteristic points

• PP (performace point): curves intersection point.
• EP (elastic point): curves intersection point assuming elastic structure behavior.
• IP (inelastic point): Point of the structure capacity curve lying on the vertical of the EP.

 

The yielding on the structure can be plotted by entering the Sd or Lambda multiplication factor in the RETROFIT area of the window, and clicking on the Plot button. This will plot the yield status of the structure in the ANSYS graphical window of the nearest calculated substep.

 

 

Related commands:

~PUSHDEF

~PUSHMOD

~PUSHSLV

~RETROFT