Connection to Detail Integration: Footing with pedestal and washer plate anchors (EN)

For the first approach, where the entire footing, including the anchorage, is modeled solely in Detail 3D, see this tutorial.

If you wish to skip the Connection design and proceed directly to the Detail 3D analysis, download the Detail 3D file and continue to Chapter 5.

1 New project

Run IDEA StatiCa Connection.

Adjust the default settings for Bolt assembly and Concrete grade, then select the template from the wizard and click Create selected design.

2 Design

After creating a template design, change the member's cross-section to IPE600A.

Now, right-click on Template 1 [P] in Operations and click Explode.

Let's modify the BP1 operation created by the template.

Continue by editing the WID1 operation.

Add Wideners for the bottom flange.

Add the new Wideners by copying the WID2 operation. Adjust the parameters to position them on the top flange of the member.

The warnings in the WID2 and WID3 operations appear because the welds connecting the wideners to the top and bottom flanges must be CJP welds for practical reasons.

Input the internal forces for anchoring.

3 Check

Let's design the welds using the Weld sizing feature. First, set the method to Capacity estimation. This option automatically calculates weld sizes that are just strong enough to transfer the applied loads. Now, run the operation.

Let's explore the results. Go to the Check tab on the ribbon and select Equivalent stress -> Bolt force -> Mesh -> Deformed, and Analysis. 

Now, let's check the Plastic strain to see the most critical part of the designed connection.

Now, review the details of the failing anchors to identify which code checks pass and which fail. A closer inspection reveals that the issue lies in the Concrete breakout resistance of the anchor in tension and the Concrete edge failure resistance. These failures can be easily resolved by adding reinforcement to the concrete. To do this, export the model to Detail 3D

4 Export

Prerequisites for export: 

• The model must be calculated, and the results included.

Go to the card Check -> RC check -> Save.

Export is available only for the anchoring topology and allows the transfer of:

• The concrete block
• Anchors
• The base plate
• Loads

Additional information and parameters that are set according to the corresponding settings in the Connection:

• Shear transfer (through Anchors, Shear lugs, and Friction) 
• Material
• Anchorage Type: Post installed (Adhesive) / Cast-in place
• Anchorage type at the end: Washer / Straight / Hook / Headed stud
• Friction coefficient
  

5 Design

In this example, the connection is anchored to a footing. We will focus only on checking the anchoring part, not the entire concrete block. If you are looking for a complete footing design, please refer to this tutorial.

Let's change the Project item settings by clicking on CON1.

Support

 Let's modify the support in the model.

Reinforcements

Before defining the reinforcement, deactivate the Rebars button. This ensures that only the specific bar group you are currently selecting is visible, keeping the view clean.

Next, insert a new Group of bars 3D to create the first reinforcement.

Duplicate the operation GB3D1 to add the next reinforcement.

Now let's create stirrups by adding a Group of bars 3D operation.

Duplicate the operation GB3D3 to add the next Stirrups.

• Note: From a computational perspective, defining this reinforcement in the Detail application is essential, as stated in the Theoretical background of the CSFM method, and  Kaufmann's book on CSFM.

Loads and combinations

Combinations are taken over from IDEA StatiCa Connection. All the details of the import are mentioned
in this article.

Let's add the Self-weight:

Create a combination with Self-weight, and add the coefficient for self-weight = 1.35 according to the code 
EN 1991-1-1

6 Check

As this tutorial focuses on anchorage design, the design codes should match in Detail 3D as well. Go to the ribbon and click on Settings -> Design code selection. Find the parameter Anchors made of bolt material in tension and/or shear, and make sure it is set to EN 1993-1-8.

Before running the analysis, we highly recommend changing the Mesh multiplier to 2 or 3 to speed up the calculation. While this step is not mandatory, it significantly reduces computational time and helps detect potential divergence issues early. If the analysis runs smoothly, you can then revert the Mesh multiplier to 1 for the final results.

Results

Equivalent Principal Stress

The equivalent principal stress (EPS) in concrete is determined based on the triaxial behaviour of the concrete block. The areas experiencing the highest loads are identified and highlighted. To provide insight into the effect of confinement compared to uniaxial compression, the equivalent stress is calculated using the kappa factor. 

Plastic Strain

To inspect the internal behavior of the concrete block, switch to the Plastic strain (ε_pl) view. Use the + New button to create Sections and adjust their Plane definition (position and rotation) in the properties window to cut through critical areas. This highlights where the concrete undergoes plastic deformation. You can save these views to the Gallery for your final Report. More information is available in this article.

After inspecting the point with the highest Plastic strain (εpl), let's turn off the section by clicking the Section icon.

Stress in rebars

The results display the σ_s, identifying the most utilized anchor via a color scale. Detailed values for stress, strain, and utilization for all anchors are listed in the tab.

Anchorage

The Anchorage tab verifies the bond strength between the reinforcement and concrete. It ensures that the provided anchorage length is sufficient to transfer the forces. The check compares the actual bond stress (τ_b) with the ultimate bond strength (f_bd) to prevent pull-out failure. You can display these results separately for Reinforcement and Anchors.

For a clear and detailed evaluation of the reinforcement, the results can be isolated for a single group. Deactivate the Rebars button and select the specific reinforcement to be checked.

Deformations

Switch to the Auxiliary tab and turn on Deformation. Although deformation limits are not prescribed for ULS (Ultimate Limit State), reviewing the deformed shape is a crucial sanity check. It ensures that the model is stable and not experiencing unrealistic displacements or rotations (e.g., due to disconnected elements). This visual inspection helps quickly identify any potential modeling issues.

7 Report

Finally, go to Report -> Detailed -> Generate. IDEA StatiCa offers a fully customizable report to print out or save in an editable format.

You have performed a complete design check according to EN 1993-1-8 (steel joints), EN 1993-1-8 (anchors), and EN 1992-1-1 (concrete structures). The steel joint and anchorage were verified in IDEA StatiCa Connection, while the concrete block and reinforcement were analyzed in IDEA StatiCa Detail using the CSFM method compliant with EN 1992-4 and EN 1993-1-8  for anchors.