In Tekla Structures 2026, logging has been improved.

All logs, such as ClashCheck.log and numberinghistory.log, are now located either in the model folder under the \logs folder, or in the local application data folder at %LocalAppdata%\Trimble\Tekla Structures\%Version%\Logs. This means your logs are in a more consistent and predictable location.

Additionally, Tekla Structures session history log files and error log files have been moved to the local application data folder at %LocalAppdata%\Trimble\Tekla Structures\%Version%\Logs or to the path specified by the advanced option XS_LOGPATH.

The files have also been renamed to the format TeklaStructures-<process id>.log for the session log and TeklaStructures-<process id>.err for the error log. The log entries for the last five Tekla Structures sessions are stored in the folder.

Additionally:

• Tekla Structures now automatically manages your log files. When you start Tekla Structures or open a model, older logs will be cleaned up, ensuring you always have the most relevant information without clutter.
• Log messages now follow a consistent format, making them easier to read and understand if you ever need to review them. This also helps our support team quickly pinpoint any issues.
• There is new API support for developers building extensions and plugins. Tekla Structures now offers a dedicated Tekla.Structures.Logging SDK. This SDK provides a consistent and official way to implement logging within your applications, ensuring that logs from your tools integrate with Tekla Structures new logging system.
• See also Location change for drawing, cloning, and printing logs.

TTSD-69076, TTSD-69882

The Numbering preview dialog now has a new separate table where you can show, select, and review identical objects that are treated in the same way in numbering. The new Individual objects table shows all the individual objects that you have selected in the main table in the Numbering preview dialog.

This improvement was already introduced in Tekla Structures 2025 SP4.

TTSD-69579

In the Design group numbering application, you can now compare parts based on their gross length and finish.

TSAC-9167

You can now activate or deactivate selection switches one by one. Hold down the Ctrl key and click the selected switches.

This improvement was already introduced in Tekla Structures 2025 SP1.

TTSD-69048

Pour solids, including continuous structures and pour objects created by pour breaks and cuts, are now created using local coordinates instead of global coordinates. The cut or split part solids are generated in local coordinates and use instancing in various operations. This approach enhances the numerical accuracy of solid creation for pours and accelerates operations because the instanced part solids created in local coordinates can be reused in many operations.

TTSD-73796

An issue was fixed where slabs with Dz1 or Dz2 offsets at corner chamfers could produce incorrect solid geometry due to mismatched triangulation between the top and bottom faces. This inconsistency led to inaccurate geometry, which could cascade to downstream processes, including volume calculation and pour unit generation. The triangulation of the faces is now mirrored consistently, ensuring reliable geometry and accurate volume computation.

This improvement was already introduced in Tekla Structures 2025 SP3.

TTSD-47057

• Previously, it was not possible to create a custom seam component with points picked in the main part's x-direction without any secondary parts. This has now been fixed.

• Previously, certain custom components with an array of objects did not work correctly. Specifically, inserting or modifying such a component increased the number of objects in the array, causing the operation to become slower and slower. Additionally, the Get or Modify operations in the dialog did not work. This has now been fixed.

These improvements were already introduced in Tekla Structures 2025 SP5.

TTSD-62177, TTSD-56963, TTSD-58139

• Searching for settings files or property files in the drop-down lists in the property pane and in several dialogs has now been improved: typing anything that matches any part of the file name is considered as a search match.

  TTSD-67211, TTSD-67221, TTSD-67240, TTSD-67294

• The filterable drop-down lists in the property pane and in several dialogs now allow you to select an item with the Enter key if there is only one item available in the list.

  TTSD-67782, TTSD-68956, TTSD-68975, TTSD-69070

These improvements were already introduced in Tekla Structures 2025 SP2.

Previously, the packaging functionality in the Support tool was not able to handle files larger than 2 GB. This issue has now been fixed, and it is possible to upload files up to 5 GB in size.

This improvement was already introduced in Tekla Structures 2025 SP1.

TTSD-69474

Tekla Model Sharing management operations can now be done through Tekla Open API.

Specific Tekla Open API operations include:

• Start sharing a model

• Browse and join a model

• Invite users to join a model

• Perform a read in

• Perform a write out

• Reserve the next write out

• Exclude a model from Tekla Model Sharing

TTSD-71030