The following product bulletins are addressed in the Tekla Structural Designer 2026 release:

• Product bulletin PBTSD-2511-1

  This issue relates to snow loading and the US regional code when the snow load action code is set to ASCE7-22 only. For windward step and parapet or projection drift loads, the drift width is being taken as 8 x (0.75 hd), rather than 8 x hd. This produces unconservative drift load values.

• Product bulletin PBTSD-2512-1

  This issue relates to RSA (Response Spectrum Analysis) results determined along the lengths of beams where partially fixed ends have been defined.

• Product bulletin PBTSD-2603-1

  The issue relates to the design of beam to column moment connections modeled in Tekla Structural Designer and checked to Eurocodes or BS using Tekla Connection Designer, either within Tekla Structural Designer directly or by export to Tekla Connection Designer. Where the beam connects to the column flange designated as 'Face C', the connection forces are not successfully passed through to the connection design. If no inspection of the connection design output is undertaken, there is the potential for an unconservative connection design status. To fix this issue install Tekla Connection Designer 26.

• [TSD-18110] - Wall edge releases modeled using zero-length link elements

  Improvements have been made to the modeling of pinned wall panel edges connected to fixed wall panel edges. Previously, this connection type was modeled using coupled coincident solver nodes, which presented two limitations: it was only applicable if the wall edge aligned with the global axis system, and it was not applicable for modal analyses.

  To address these limitations, the coincident solver nodes are now uncoupled and connected via a new zero-length link 1D solver element. This enhancement removes the previous restrictions, allowing for greater flexibility in modeling and analysis.

• [TSD-18674] - Core foundation reactions not included when filtering for sub-structures

  It is now possible to include concrete cores in Sub Structures. This happens automatically as soon as any member of the core is included, reaffirming that a concrete core is viewed as a monolithic structure.

  This change ultimately enables the reporting of concrete core results (particularly foundation reactions) when filtering report chapters by Sub Structures that include cores.

• [TSD-18850] - Steel connections - Portal frame connections group

  Connections belonging to portal frames in the 3D building are now also included in their own Portal Frames group in the connections window. They are grouped as Portal Frame > Connection type > Span > Connection.

  Additionally, a new Update Connections button is now available at the top of the window for ease of use. This allows you to update all connections in the model (including portal frame connections) with a single click. The button operates in the same way as the existing Update Connections command located on the right click context menu of the Connections branch.

  

• [TSD-17940] - Letter prefixes for grids in both directions

  A new Prefix grid line names property has been added to the Properties Window for Architectural Grids.

  

  The same property has also been added to the first pages of the Rectangular and Sector Grid Wizards.

  

  When Prefix grid line names is on, the grid lines in the selected Architectural Grid will be prefixed with the Architectural Grid name.

  Example: An Architectural Grid is named "A" and "Prefix grid line names" is on.

  

  As a result the gridlines running vertically are labelled AA, AB, AC, AD etc and the gridlines running horizontally are labelled A1, A2, A3, A4 etc

  

• [TSD-19104] - Renaming of the Reference Models window

  To reflect the fact that imports can now generate connected, solvable models, (not just reference models), the Reference Models window has been renamed Import Models.

• [TSD-19221] - Limit No. of Portal Frame Spans for TSD LT License

  The new portal frame design capability for Eurocodes in Tekla Structural Designer 2026 includes a limitation on the number of spans based on the license type. Users with an LT license are restricted to defining a maximum of 1 portal frame span, while users with a full license can define up to 10 portal frame spans.

• [TSD-18683] - US wind code (ASCE7-16 and ASCE7-22) - roof load for angled wind cases

  An enhancement has been made to address an omission in the implementation of US wind code ASCE7-16 and ASCE7-22 for rigid buildings of all heights. Previously, while roof zones were calculated for wind applied face on (as shown below left), they were not calculated when the wind was at an angle (as shown below right). This was because the code provided no clear guidance for the angled wind. In this situation users were able to manually add loads if they were required.

  

  The new implementation now follows the code commentary by applying roof loads at angles, breaking the roof into zones (up to 16) and applying the maximum required pressure in each zone.

  

• [TSD-13232] - Eurocode wind loading - perform division by parts to Clause 7.2.2 and Figure 7.4

  Previously ‘Division by Parts’, as described in BS EN 1991-1-4:2005, Clause 7.2.2 (1) and Figure 7.4, was not catered for in Tekla Structural Designer.

  The basic premise of this method allows you to divide the windward face of a rectangular building (Zone D) into separately loaded parts. A series of wind pressures are then calculated which increase with building height based upon the height of each divided part.

  

Division by parts has now been implemented in Tekla Structural Designer 2026 as follows:

• An option has been added to the Basic Data page of the Wind Wizard to allow you to confirm if division by parts is appropriate.

  

• After indicating that it is appropriate, an extra checkbox appears to allow you to switch on division by parts.

  

• By selecting this option, you can then specify the number of strips that you want in the central section.

  

• When you complete the wind wizard and display the wind view, the effect is as shown below.

  The image on the left shows the zoning on the windward face that would have occurred without using division by parts. The image on the right shows the new zoning. (The central section being divided into 4 parts in this example).

  

• Remoting API Enhancements

  Some enhancements have been made to the Open API - for information about these see the Tekla Structural Designer 2026 Open API Release Notes.

• [TSD-19122] - Cannot export analysis results to Revit

  Previously when exporting to Revit and including analytical results, the warning message "Analysis results are not valid for First Order Linear" was displayed and no results were written into the CXL file. This issue has now been fixed.

• [TSD-19130] - Tekla Structural Designer to any application import via a remote connection

  The Remote Access option, found on the BIM Integration ribbon, enables the import of a Tekla Structural Designer model by any application from a remote computer via a secure, authenticated connection.

  

  This connection proceeds once the Tekla Structural Designer user (acting as the server) is prepared to publish their saved model and the user of the connecting application (the client) is ready to receive it.

  Crucially, the respective users must agree on a mutually convenient time for the transfer. This is because the Remote Access wizard is modal, meaning the Tekla Structural Designer model is locked and cannot be used for any other operations while the wizard remains open.

  For further details, see Remote Access API

• [TSD-19158] - Inactive setting does not work for axial spring Analysis elements

  In previous releases where an analysis element was defined and then set inactive, it would continue to be active in the analysis. This has been corrected in R26.

• [TSD-18945] - Static results disappearing after running RSA seismic analysis

  In previous releases when you had a valid set of results from a static analysis, but you then ran the Seismic Wizard followed by Design All (RSA), this would invalidate the existing static results. This has been corrected in R26.

• [TSD-18857] - Portal Frame Design - not available for 3D portal frame members

  Previously, although the design of portal frames in Tekla Structural Designer was not catered for, there was a route by which individual rafters and columns within the portal frame could still be designed. Such designs would be very conservative because the portal frame haunches were not considered in the design. There was also no way in Tekla Structural Designer to perform the member stability checks that would be required.

  As there is now a dedicated 2D environment for portal frame design in Tekla Structural Designer (for details, see: Portal frame design to Eurocodes), the following options that previously enabled the design of portal frame rafters and columns in the 3D environment have been removed:

  • ‘Check Member’ and ‘Design Member’ options on the context menu

  • ‘Autodesign’ in the Portal Frame Properties window