IDEA StatiCa tutorial – Stiffness analysis (EN)

Welcome to IDEA StatiCa tutorial. This tutorial shows how to use software IDEA StatiCa to model, design and check a structural steel joint and calculate stiffness of the connection.

 

1 New project

Let’s launch IDEA StatiCa and select application Connection. We create a new project by selecting a starting template closest to the desired design, fill the name and choose design code and starting material properties – S 235.

 

2 Geometry

Three beams were automatically added.

 

3 Load effects

One load effect was automatically added. We input the values of internal forces into the chart. More load cases can be added.

 

4 Design

We will define a set of manufacturing operations to model connections between members. Let’s start with the right mouse button click at the Operations row in the tree of entities in the 3D scene. We choose the New operation command from context menu.

 

In dialog with all available manufacturing operation we will choose the End plate operation.

 

And proceed with the choosing of desired bolt assembly, the M20 10.9.

 

Now we have to define the right properties for creating desired connection. Follow the values in the picture below.

 

Let’s copy operation EP1. With the right mouse button click at the EP1 and choose Copy.

 

Now we have to set the correct member for EP2.

 

Let’s add next new operation with the right mouse button. Click at the Operations row in the tree of entities in the 3D scene. We choose the New operation command from context menu.

 

In dialog with all available manufacturing operation we will choose the Stiffener operation.

 

Now we need to modify the manufacturing operation STIFF1.

 

Let’s check final design of the joint.

 

5 Check

We start the analysis based on CBFEM by clicking Calculate in the ribbon. Analysis model is automatically generated, calculation is performed and we can see the Overall check displayed together with basic values of check results.

 

We go to the display tab Check and there we activate Strain check, Bolt forces, Mesh and Deformed from the ribbon to get a full picture of what is happening in the joint.

 

6 Stiffness analysis settings

To change the analysis type to Stiffness click on the ST icon in the top ribbon.

 

And we also check if beam B1 is set as Analysed member as shown below. (If we want switch Analysed member, we can use right mouse button and set other member as Analysed member).

The “Theoretical length for My, Mz” can be set for the analysed member. For more information about Theoretical length, please see Theoretical background and Video – tips for stiffness analysis.

 

7 Stiffness analysis

Stiffness analysis is started by icon Calculate from the top ribbon. All values and graph can be checked in details by Rotational stiffness tab selection.

 

8 Modification of connection

Let’s modify end plate EP1 to increase rigidity of the connection.

 

Now run stiffness analysis again by icon Calculate from the top ribbon. And we can notice the change in results from Semi-rigid to Rigid.

 

For more information on stiffness analysis, please check out our Theoretical background and video.

 

9 Report

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

We have designed, code-checked and calculated stiffness of the connection according to Eurocode.

 

10 More information

Video - introduction to stiffness

 

Video – tips for stiffness analysis

 

For more information, please visit our Theoretical background

 

Keywords:

connection, joint, Eurocode, bolt, end plate, code-check, stiffness analysis, rigid, semi-rigid, stiffness, length, CBFEM

 

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