Buckling analysis of a steel connection (AISC)

Learn how to use IDEA StatiCa Connection to design and code-check a structural steel joint, an example is the local buckling of a fin plate connection.

1 New project

Let’s launch the IDEA StatiCa Connection application. Create a new project by selecting a template closest to the required design and fill the name and the description of the project. After choosing the required properties, confirm by Create project.

Since you work under the AISC code, set the imperial units (see How to change the system of units).

2 Geometry

Start with the modification of the joint geometry. Right-click on the web of the continuous beam opens the context menu with all available actions for the beams. Use the Plus button to add a new cross-section.

Choose the I profile and the W(Imp) category and W(Imp)8X31 cross-section.

Proceed with the change of cross-section on the perpendicular member. Again, use the right mouse button click on the web and choose Plus to add a new cross-section. Select the HSS(Imp)3X3X3/16 cross-section.

Now you can adjust the properties of the beam B1 with a squared cross-section. Follow the picture below.

3 Load effects

Let’s continue with the Load effects. One load effect was automatically added by the wizard. Input the –15 kip normal force in the tab.

4 Design

Now define the manufacturing operation. Start with the right mouse button and click on the Operations row in the tree of entities in the 3D scene. Choose the New operation command from the context menu.

In the tab of all available manufacturing operations, choose the Connecting plate operation.

And proceed with the choosing of the desired bolt assembly, the A490 5/8.

Now define the properties of the connecting plate. Follow the values in the picture below.

5 Calculation and Check

Now you can switch to the Check tab at the top of the ribbon and then start the calculation of Buckling analysis under the Calculation command button.

When the analysis is finished, turn on the Buckling shape, Mesh, and Deformed view. A table of critical buckling factors is provided in the tab Buckling.

By clicking on each row in the tab of critical buckling factors, you can browse the deformed shapes in the 3D window and analyze them visually. The critical buckling factor can be compared with the code requirements. Usually, buckling can be considered safe in case of critical buckling factor values greater than 15 for global buckling and 3 for local buckling.

6 Report

At last, go to the tab Report. IDEA StatiCa offers a fully customizable report to print out or save in an editable format.

You have designed, optimized, and code-checked a structural steel joint according to AISC.

Sample files


Steel joint buckling analysis

Global buckling vs. local buckling. What does it mean?

Lateral Torsional Buckling

Connection Wednesdays – Focus on buckling