# Buckling analysis for a column with both fixed ends in Ansys Workbench.

How to do buckling analysis for a column with both fixed ends in Ansys Workbench.

1. ### Step 1: Material and calculation model

1. Drag the Static Structual Module to the workspace:

2. Check the mechanical properties of the material in the Engineering Data. For this problem it is necessary to check the values of Young's modulus and density of the material:

3. Load or create a calculation model into the Geometry step. In this example, we consider a square rod (100x100mm) that is 2500mm high.

2. ### Step 2: Boundary condition

1. Create a mesh in the model step.

2. Set the boundary conditions  for anchoring the model. Set Fixed Support on the bottom face. For the top face, you must leave the option to move along the vertical axis.

3. Set the boundary conditions for the load on the model. Install force of 1H acting downwards on the top face. (NOTE: If you set force which really acts on your construction in results will get buckling safety factor).

4. Perform the calculation in the Static Structual Module

3. ### Step 3: Mode extractions

1. Connect solution of the Static Structual module with Eigenvalue Buckling module.

2. In the Eigenvalue Buckling Module simply select the required number of modes to extract. Boundary conditions are not required because they have been transferred from the Static Structual Module.

3. Left-click the solution in the left tree. The Load Multiplier table displays the result of the solution. As you can see in this example, the structure will lose stability in the first mode if the force acting from top to bottom is more than 5.34 E+06H , will lose stability in the second mode if the force acting from top to bottom is more than 1.57 E+07H and will lose stability in the third mode if the force acting from top to bottom is more than 3.07 E+07H.

4. To display modes insert the Total Deformation with to the solution of the Buckling Eigenvalues Module.

The First Mode:

The second mode:

The third mode: