No new license is required for this version.

Client License Service Version - no update is required for this release.

License Server Version - this relates only to perpetual licenses and the Server (Sentinel RMS) license method. Provided your license server has been updated to version 4.3.x or later (incorporating Sentinel RMS 10.0 which added support for Windows 11), no update is required for this release.

This service pack requires Tekla Structural Designer 2025 first release or later to be installed and will update your current version.

• Tekla Structures - if you wish to integrate with Tekla Structures for optimum performance you should install both this release and Tekla Structures 2025 (and the most recent Service Pack for this).

• Tekla Tedds - for integrated design using Tekla Tedds you should install Tekla Tedds 2025 AND ensure you have installed the latest updates for this. These can be obtained from Trimble Downloads.

• Tekla Portal Frame and Connection Designer 25 - if you install this release and use Tekla Portal Frame Designer and/or Tekla Connection Designer you should install Tekla Portal Frame Designer 25 and/or Tekla Connection Designer 25 available from Trimble Downloads.

• Autodesk® Revit® - the most recent Tekla Structural Designer Integrator for Autodesk Revit 2025 was released in April 2025. For more information about this see the Tekla Structural Designer Integrator for Autodesk Revit 2025 SP1 Release Notes. The installation for this is available from Trimble Downloads. If you are now using Autodesk Revit 2025, you can install this to perform BIM integration with Tekla Structural Designer.

  • Supported Revit Versions - the other currently supported Revit versions are: Tekla Structural Designer Integrator for Autodesk Revit 2023 SP2 and Tekla Structural Designer Integrator for Autodesk Revit 2024 SP2. The installation for these are available from Trimble Downloads. If you are performing BIM integration with any of these previous Revit© versions, we recommend you install the latest version of the associated Integrator.

Previous Versions and file compatibility - files from all previous versions can be opened in this release, however note that, once saved, they cannot then be opened in a previous release. If you wish to retain this option we therefore recommend using the File > Save As… option to save a copy of the file in the previous release and retain the original.

General performance and stability improvements

A number of additional fixes which are not detailed explicitly here are also made in this release to improve general performance and stability. An example of this is given directly below:

• [TSD-18007] - Crash when double-clicking on Calculate under Floor Construction

  An issue which caused a program exception when double-clicking on the Calculate [...] button located under Floor Construction in the Composite Beam Properties window is fixed in this release. This issue relates only to the 2025 first release (version 25.0.1.45) in which it was introduced.

[TSD-17913] - Scene content selections revert when using BIM Status show/alter state

Previously, when in a Review View, if you made changes to Scene Contents settings, the Scene Content settings would incorrectly reset when certain Review operations were performed. This issue has now been fixed.

[TSD-17712] - Imbalance between the total load on the structure and the Vertical Forces in Nodes - incorrectly configured brace pairs

Incorrectly configured brace pairs - such as a K brace pair with the "apex" at the top - will cause a Process Window warning “Imbalance between the total load on the structure and the Vertical Forces in Nodes” following analysis or design. To help prevent this, a new validation check is added in this release to confirm that K, V and A brace pair types are positioned in accordance with the following positioning rules:

• K brace pairs should have the "apex" to the left or right

• V brace pairs should have the "apex" at the bottom

• A brace pairs should have the "apex" at the top

Brace pairs that contravene the rules are listed in the validation warning and an option is provided on the right-click context menu to "Fix Brace Pair Type". When clicked, the position of the brace does not change, but its type is corrected. (For example if you model a K brace pair with the "apex" at the top, after fixing, its type would change to an A brace pair).

[TSD-17693] - Scene content - Slab/member temperature loads

In the Scene Content window, under Loading the Temperature option now has an extra level of control to allow Member and Area Element temperature loads to be displayed independently.

[TSD-17984] - Exception - Creating zero width foundation mat strip

Two changes have been made to mat foundations created using the strip method:

• Strip mats now have a minimum width limit of 150 mm or 6 in. depending on the unit system. This minimum has been implemented in order to avoid issues that can arise when creating strips of unreasonable width.

• When defining a strip mat, previously you were required to enter the strip “Width” measured from the strip center line to the face of the strip. As this was not particularly intuitive, the “Width” is now measured from face to face. This change only applies to newly created strip mats, the width of previously created strip mats in existing models remains unchanged.

Structural BIM Integration

For Structural BIM Integration the following enhancements and fixes are made in this release:

• [TSD-15208] - CXL file import - baseplates not created under certain columns

  Previously, following a CXL file import into Tekla Structural Designer, baseplates would not be created under columns that had braces attached. This issue is fixed in this release.

• [TSD-17162] - CXL file import - Invalid geometry when importing column with splice from Revit.

  An issue which resulted in an invalid geometry warning when a Revit model column splice was imported to Tekla Structural Designer is fixed in this release.

• [TSD-15978] - CXL file import - Exception during import

  Sometimes, due to model changes made in the other product (used to create the cxl file), it is necessary to split existing Tekla Structural Designer columns into two objects. In some circumstances, this led to corrupted stack data. This issue is fixed in this release.

• [TSD-18051] - CXL file import - Importing the original column removes splits and stacks, preventing further splitting

  In certain circumstances, when updating an existing model, updated columns were not correctly divided into stacks after Structural BIM Import. This is fixed in this release.

[TSD-12604] - Integration with Tekla Structures - mapping of cold formed hollow steel profiles for Nordic countries

[TSD-17903] - IFC header file standardisation

In this release, when the model is exported to an IFC file, the file header information is standardized to more closely align with those from SketchUp and other Trimble applications.

[TSD-17786] - Footfall analysis model - beam not connected to supporting wall

Previously, in footfall analysis models beams could be completely detached from an intended supporting wall in certain unusual situations. This would result in unrealistic vibration modes which in turn caused higher response factors and potentially checks that showed as failing when they should have passed. This issue has now been fixed.

[TSD-17746] - Incorrectly using inelastic story drift to calculate Seismic Stability coefficient

Previously there was an error in the seismic drift calculation when working to ASCE7-22. The inelastic story drift was being used to calculate the seismic stability coefficient, which contradicts ASCE 7-22 Section 12.8.7 and equation 12.8-18. The elastic story drift should have been used, not the inelastic story drift. This produced an over-conservative result for the drift check. This issue has now been fixed.

Fire Data Improvements

Building on the features for steel member fire design/ protection which were expanded in the 2025 Release (see Eurocode - steel member fire data calculation), the following improvements are made to Fire Data in this release:

• [TSD-17893] - Improve property behaviour for steel members

  The property 'Required time of fire exposure' in the 'Fire proofing' properties group of steel members is now also made available for members protected but not checked for fire resistance.

• [TSD-17897] - Update / delete UDA values

  The values of automatically populated fire design related UDAs are now cleared when running the Populate UDAs command in cases where the fire data is no longer available.

[TSD-17851] - Cold Formed column design incorrectly beyond scope

An issue introduced in release 2025 which caused the design status of cold formed columns to EC3 bending combined to be incorrectly beyond scope is fixed in this release.